Delphi Programming: Most Popular Articles
These articles are the most popular over the last month.
Virtual Key Codes
Symbolic constant names, hexadecimal values, and keyboard equivalents for the virtual key codes used by Windows.
Symbolic constant names, hexadecimal values, and keyboard equivalents for the virtual key codes used by Windows.
Network traffic monitor
A free network (Internet / intranet) traffic (download / upload) monitor. Network traffic monitor allows you to quickly and easily examine the network usage of the local computer. Full Delphi source code included.
A free network (Internet / intranet) traffic (download / upload) monitor. Network traffic monitor allows you to quickly and easily examine the network usage of the local computer. Full Delphi source code included.
A Beginner's Guide to Delphi
A Beginner's Guide to Delphi Programming. Free online programming tutorial / course for beginner developers. Focus on Borland Delphi.
A Beginner's Guide to Delphi Programming. Free online programming tutorial / course for beginner developers. Focus on Borland Delphi.
DBGrid to the Max
Contrary to most other Delphi data-aware controls, the DBGrid component has many nice features and is more powerful than you would have thought. The "standard" DBGrid does its job of displaying and manipulating records from a dataset in a tabular grid. However, there are many ways (and reasons) why you should consider customizing the output of a DBGrid...
Contrary to most other Delphi data-aware controls, the DBGrid component has many nice features and is more powerful than you would have thought. The "standard" DBGrid does its job of displaying and manipulating records from a dataset in a tabular grid. However, there are many ways (and reasons) why you should consider customizing the output of a DBGrid...
Date/Time routines - Delphi Programming
Date/Time Delphi functions and procedures in RTL: rtl reference delphi programming time routines ordinal position date function
Date/Time Delphi functions and procedures in RTL: rtl reference delphi programming time routines ordinal position date function
Execute External Program, File
Executing and Running Applications and Files from Delphi Code.
Executing and Running Applications and Files from Delphi Code.
Preserve Code Folding
Introduced in Delphi 8, code folding is a feature of the Delphi IDE which lets you collapse (hide) and expand (show) your code to make it easier to navigate and read. By default, when you close and reopen your project the code that you collapsed would appear expanded - your code folding preferebces are not saved. Here's how to "fix" this.
Introduced in Delphi 8, code folding is a feature of the Delphi IDE which lets you collapse (hide) and expand (show) your code to make it easier to navigate and read. By default, when you close and reopen your project the code that you collapsed would appear expanded - your code folding preferebces are not saved. Here's how to "fix" this.
TListBox Incremental Search
Imagine a list box with a huge number of (unsorted) items. Finding the one user wants to select might turn into a nightmare. Let's provide the user with an option to immediately locate the item in the list box by adding incremental search functionality.
Imagine a list box with a huge number of (unsorted) items. Finding the one user wants to select might turn into a nightmare. Let's provide the user with an option to immediately locate the item in the list box by adding incremental search functionality.
Understanding Arrays in Delphi
The concept of arrays in Delphi is simple: arrays allow us to refer to a series of variables by the same name and to use a number (an index) to tell them apart. Arrays have both upper and lower bounds, and the elements of the array are contiguous within those bounds.
The concept of arrays in Delphi is simple: arrays allow us to refer to a series of variables by the same name and to use a number (an index) to tell them apart. Arrays have both upper and lower bounds, and the elements of the array are contiguous within those bounds.
Database Programming Course
Free online database programming course for beginner Delphi developers. Focus on ADO techniques.
Free online database programming course for beginner Delphi developers. Focus on ADO techniques.
String handling routines - Delphi Programming
String handling routines: rtl reference cr lf delphi programming dynamic array case sensitivity
String handling routines: rtl reference cr lf delphi programming dynamic array case sensitivity
Sending Email Messages
Send email messages with attachments using Indy and Delphi. Full source code to a simple "SMTP Mail Sender" application included.
Send email messages with attachments using Indy and Delphi. Full source code to a simple "SMTP Mail Sender" application included.
XML and Delphi
Everything you need to know about Delphi and the Extensible Markup Language. Find out about creating and parsing XML documents, look for parser components and more.
Everything you need to know about Delphi and the Extensible Markup Language. Find out about creating and parsing XML documents, look for parser components and more.
Understanding Keyboard Events
Get familiar with the OnKeyDown, OnKeyUp, and onKeyPress Delphi event procedures to respond to various key actions or handle and process ASCII characters along with other special purpose keys.
Get familiar with the OnKeyDown, OnKeyUp, and onKeyPress Delphi event procedures to respond to various key actions or handle and process ASCII characters along with other special purpose keys.
SQL in Delphi
Using Structured Query Language in Delphi.: tquery component delphi sql dbase tables interbase server component delphi
Using Structured Query Language in Delphi.: tquery component delphi sql dbase tables interbase server component delphi
Creating and Using DLLs
A Dynamic Link library, or DLL, is a collection of routines (small programs) that can be called by applications and by other DLLs. Using Delphi, we can write and use our own DLLs, and we can call functions in DLLs developed with other systems / by other developers. Find out how.
A Dynamic Link library, or DLL, is a collection of routines (small programs) that can be called by applications and by other DLLs. Using Delphi, we can write and use our own DLLs, and we can call functions in DLLs developed with other systems / by other developers. Find out how.
Understanding the TextBox ASP.NET control
Understanding the TextBox ASP.NET control. Taking a quick look at the TextBox ASP.NET web server control - the only control designed for user input. TextBox has several faces: single-line text entry, password entry or multi-line text entry.
Understanding the TextBox ASP.NET control. Taking a quick look at the TextBox ASP.NET web server control - the only control designed for user input. TextBox has several faces: single-line text entry, password entry or multi-line text entry.
Popup Menu Custom Item Heights
If you need to have different height for some of the menu items, in Delphi applications, you must turn to owner drawing. Here's how to draw a custom szed image for a popup menu item.
If you need to have different height for some of the menu items, in Delphi applications, you must turn to owner drawing. Here's how to draw a custom szed image for a popup menu item.
Create an Internet Shortcut
Unlike regular .LNK shortcuts (that point to a document or an application), Internet Shortcuts point to an URL (web document). Here's how to create an .URL file, Internet Shortcut, using Delphi.
Unlike regular .LNK shortcuts (that point to a document or an application), Internet Shortcuts point to an URL (web document). Here's how to create an .URL file, Internet Shortcut, using Delphi.
Accessing and managing MS Excel sheets with Delphi (Page 1/7)
Accessing and managing MS Excel sheets with Delphi. How to retrieve, display and edit Microsoft Excel spreadsheets with ADO (dbGO) and Delphi. This step-by-step article describes how to connect to Excel, retrieve sheet data, and enable editing of data (using the DBGrid). You'll also find a list of most common errors (and how to deal with them) that might pop up in the process.
Accessing and managing MS Excel sheets with Delphi. How to retrieve, display and edit Microsoft Excel spreadsheets with ADO (dbGO) and Delphi. This step-by-step article describes how to connect to Excel, retrieve sheet data, and enable editing of data (using the DBGrid). You'll also find a list of most common errors (and how to deal with them) that might pop up in the process.
String Types in Delphi (Delphi For Beginners)
Understanding and managing string data types in Delphi's Object Pascal. Learn about differences between Short, Long, Wide and null-terminated strings.
Understanding and managing string data types in Delphi's Object Pascal. Learn about differences between Short, Long, Wide and null-terminated strings.
Understanding Pointer in Delph
An introduction to pointer data type in Delphi. What are pointers, why, when and how to use them.
An introduction to pointer data type in Delphi. What are pointers, why, when and how to use them.
Delphi Tips 173 - 176
Delphi tip: How to split a string into an array
Delphi tip: How to split a string into an array
Free Screen Ruler
Screen RULER allows you to precisely measure anything on your computer screen. If you need to determine width and/or height of any object on your screen, Screen RULER is the tool to use. Transparency, units in pixels and millimeters and screen snapping are some of the features.
Screen RULER allows you to precisely measure anything on your computer screen. If you need to determine width and/or height of any object on your screen, Screen RULER is the tool to use. Transparency, units in pixels and millimeters and screen snapping are some of the features.
Understanding the Delphi unit source - Page 1/2
Take a closer look at exactly what each keyword means by examining each line of the Delphi form unit source code. Interface, implementation, uses and other keywords explained in easy language!
Take a closer look at exactly what each keyword means by examining each line of the Delphi form unit source code. Interface, implementation, uses and other keywords explained in easy language!
Dynamic Link Libraries
Everything you ever wanted to know about DLLs and Delphi but didn't know where to look for answers (or were to afraid to ask)
Everything you ever wanted to know about DLLs and Delphi but didn't know where to look for answers (or were to afraid to ask)
Save a Web Page as MHT
Here's how to save a web page displayed inside a WebBrowser (TWebBrowser component) as a raw HTML file or into a single (MHT) file (MHTML format: web archive - single file) programmatically using Delphi.
Here's how to save a web page displayed inside a WebBrowser (TWebBrowser component) as a raw HTML file or into a single (MHT) file (MHTML format: web archive - single file) programmatically using Delphi.
Managing Ascii (Text) Files
Reading and writing to text (ascii) files using Delphi code. Find out how to read a line by line of a txt file and how to write some data back to the file.
Reading and writing to text (ascii) files using Delphi code. Find out how to read a line by line of a txt file and how to write some data back to the file.
Exchanging Data over the Network using Delphi
Exchanging Data over the Network using Delphi. In this article we'll examine two Delphi components: TServerSocket and TClientSocket, both designed to let you read and write information over a TCP/IP connection - thus enabling you to write network-aware applications.
Exchanging Data over the Network using Delphi. In this article we'll examine two Delphi components: TServerSocket and TClientSocket, both designed to let you read and write information over a TCP/IP connection - thus enabling you to write network-aware applications.
Decompiling Delphi
Whispering about reverse engineering Delphi applications: 'I have a Delphi program's .exe, can I decompile it and get the source?'
Whispering about reverse engineering Delphi applications: 'I have a Delphi program's .exe, can I decompile it and get the source?'
Login Dialog Before Main Form
If you need to implement some kind of authorization for your Delphi application you might want to display a login / password dialog *before* the main form is created and displayed to the user. In short, the idea would be to create, display, and destroy the "login" dialog before creating the main form. Here's how.
If you need to implement some kind of authorization for your Delphi application you might want to display a login / password dialog *before* the main form is created and displayed to the user. In short, the idea would be to create, display, and destroy the "login" dialog before creating the main form. Here's how.
DateTime Format for Access SQL
Fixing the "Parameter object is improperly defined. Inconsistent or incomplete information was provided" error when formatting date time values for SQL queries when using Access and Delphi.
Fixing the "Parameter object is improperly defined. Inconsistent or incomplete information was provided" error when formatting date time values for SQL queries when using Access and Delphi.
For, Repeat & While in Delphi
Loops allow you to execute a sequence of statements repeatedly, using a control condition or variable to determine when the execution stops. Delphi has three kinds of control loop: repeat statements, while statements, and for statements. Learn how to use loops in Delphi programming.
Loops allow you to execute a sequence of statements repeatedly, using a control condition or variable to determine when the execution stops. Delphi has three kinds of control loop: repeat statements, while statements, and for statements. Learn how to use loops in Delphi programming.
CheckBox inside a DBGrid
Adding components to a DBGrid. Here's how to place a check box into a DBGrid. Create visually more attractive user interfaces for editing boolean fields inside a DBGrid.
Adding components to a DBGrid. Here's how to place a check box into a DBGrid. Create visually more attractive user interfaces for editing boolean fields inside a DBGrid.
Introducing Borland Delphi - Page 1/3
A Beginner’s Guide to Delphi Programming: Chapter 1. What is Borland Delphi? Where to download a free version, how to install and configure it.
A Beginner’s Guide to Delphi Programming: Chapter 1. What is Borland Delphi? Where to download a free version, how to install and configure it.
Initialize Constant Arrays
Sometimes you need to declare a constant array in Delphi - a read-only array. You cannot change the value of a constant or a read-only variable. Therefore, while declaring a constant array you have to initialize it. Here are a few examples of declaring and initializing constant arrays in Delphi...
Sometimes you need to declare a constant array in Delphi - a read-only array. You cannot change the value of a constant or a read-only variable. Therefore, while declaring a constant array you have to initialize it. Here are a few examples of declaring and initializing constant arrays in Delphi...
Coloring the TDBGrid Delphi component
Coloring DBGrid. How to enhance the functionality of a TDBgrid component using colors
Coloring DBGrid. How to enhance the functionality of a TDBgrid component using colors
Run with Parameters
How to pass command-line parameters to your Delphi application and how to handle them.
How to pass command-line parameters to your Delphi application and how to handle them.
Delphi Tips and Tricks
Delphi tips, tricks and code snippets. Looking for a small code sample to help you make something big? It's here!
Delphi tips, tricks and code snippets. Looking for a small code sample to help you make something big? It's here!
Manipulate .INI files / Delphi
The .INI files have a text-based file format for representing application configuration data in a format which is easily editable by humans and readable by a simple automatic parser. Learn how to use Delphi's TIniFile to read and write INI configuration files.
The .INI files have a text-based file format for representing application configuration data in a format which is easily editable by humans and readable by a simple automatic parser. Learn how to use Delphi's TIniFile to read and write INI configuration files.
Handling Windows Messages
One of the keys to traditional Windows programming is handling the messages sent by Windows to applications. Handling Windows Messages the Delphi way!
One of the keys to traditional Windows programming is handling the messages sent by Windows to applications. Handling Windows Messages the Delphi way!
TClipboard.Cut-Copy-Paste
Working with the Windows Clipboard from a Delphi application - basic operations: Cut, Copy and Paste.
Working with the Windows Clipboard from a Delphi application - basic operations: Cut, Copy and Paste.
Pos function
Delphi's Pos function returns an integer specifying the position of the first occurrence of one string within another.
Delphi's Pos function returns an integer specifying the position of the first occurrence of one string within another.
Understanding ViewState and Postback Processing in ASP.NET applications
A Beginner's Guide to ASP.NET Programming for Delphi developers: Chapter 18. Find out what events (and in what order) are generated when ASP.NET receives a request for a Web Form. Learn about the ViewState - a technique ASP.NET uses to maintain page state changes across postbacks.
A Beginner's Guide to ASP.NET Programming for Delphi developers: Chapter 18. Find out what events (and in what order) are generated when ASP.NET receives a request for a Web Form. Learn about the ViewState - a technique ASP.NET uses to maintain page state changes across postbacks.
All the Delphi RTL Quick Reference - Delphi Programming
All the Delphi RTL (run time library functions and procedures) Quick Reference
All the Delphi RTL (run time library functions and procedures) Quick Reference
Using TClientDataSet
Looking for a single-file, single-user database for your next Delphi application? Need to store some application specific data but you do not want to user the Registry / INI / or something else?
Looking for a single-file, single-user database for your next Delphi application? Need to store some application specific data but you do not want to user the Registry / INI / or something else?
Record (Struct) Type in Delphi
Learn about records, Delphi's data structure that can mix any of Delphi's built in types including any types you have created.
Learn about records, Delphi's data structure that can mix any of Delphi's built in types including any types you have created.
Guide to dbExpress
One of data connectivity options in Delphi is dbExpress. This articles provides an overview of dbExpress along with a collection of tutorials and articles on building database applications using this light-weight, cross-platform data access technology.
One of data connectivity options in Delphi is dbExpress. This articles provides an overview of dbExpress along with a collection of tutorials and articles on building database applications using this light-weight, cross-platform data access technology.
Inside the (Delphi) EXE
Storing more that just code in the application executable file. Working with resources from Delphi. How to embed a WAV, AVI and an MP3 file in a Delphi executable.
Storing more that just code in the application executable file. Working with resources from Delphi. How to embed a WAV, AVI and an MP3 file in a Delphi executable.
Drag 'n' Drop in VCL
Delphi makes it easy to program dragging & dropping into our applications. We can even drag and drop from one form to another or from Windows Explorer to our application, or from-to what ever we want, as you will see.
Delphi makes it easy to program dragging & dropping into our applications. We can even drag and drop from one form to another or from Windows Explorer to our application, or from-to what ever we want, as you will see.
Base Conversions
Borland Delphi functions for converting Int to Bin, Int to Hex, Int to Roman and vice versa.
Borland Delphi functions for converting Int to Bin, Int to Hex, Int to Roman and vice versa.
Filename Extensions in Delphi
List of the file extensions created (and used) by Delphi and what they all mean. Plus, get to know what Delphi generated files should be stored in a source control system.
List of the file extensions created (and used) by Delphi and what they all mean. Plus, get to know what Delphi generated files should be stored in a source control system.
Resource Files Made Easy (in Delphi applications)
How Delphi uses standard Windows-format resource files: icons, bitmaps and cursors.
How Delphi uses standard Windows-format resource files: icons, bitmaps and cursors.
Searching for Files / Folders
Stop. This is the one and only solution to file searching. Use Delphi to find any file in any directory and/or subdirectory that match a certain mask. Start searching.
Stop. This is the one and only solution to file searching. Use Delphi to find any file in any directory and/or subdirectory that match a certain mask. Start searching.
Creating your first 'Hello World' Delphi Application - Page 1/3
An overview of application development with Delphi, including creating a simple project, writing code, compiling and running a project. Also, find out how to ask Delphi for help.
An overview of application development with Delphi, including creating a simple project, writing code, compiling and running a project. Also, find out how to ask Delphi for help.
Connecting to a database. BDE? ADO? - DB/2 - Page 1/4
Chapter two of the free Delphi database online course. How to connect to an Access database - the UDL file? Looking forward: the smallest ADO example.
Chapter two of the free Delphi database online course. How to connect to an Access database - the UDL file? Looking forward: the smallest ADO example.
Exchanging Data over the Network using Delphi - Part2
Exchanging Data over the Network using Delphi. An introduction to sending data over the network using Delphi and Indy. The article focuses on sending / receiving record data and raw (binary) data using TCP connections.
Exchanging Data over the Network using Delphi. An introduction to sending data over the network using Delphi and Indy. The article focuses on sending / receiving record data and raw (binary) data using TCP connections.
UDP vs. TCP
Everybody is quite familiar with TCP. Most do know UDP and think it’s an inferior protocol, as it does not ensure that the data bytes sent will arrive at the other site. Thus, UDP imposes less network overhead than TCP and gives the programmer more freedom and more labor by forcing him to deal with the security of the data transport himself.
Everybody is quite familiar with TCP. Most do know UDP and think it’s an inferior protocol, as it does not ensure that the data bytes sent will arrive at the other site. Thus, UDP imposes less network overhead than TCP and gives the programmer more freedom and more labor by forcing him to deal with the security of the data transport himself.
Working with GIF images in Del
Working with GIF images in Delphi. Need to display an animated GIF image in a Delphi application? Even though Delphi does not natively support GIF image files formats (like BMP or JPEG) there are a few great (free source) components available on the Net, which add the ability to display and manipulate GIF images at run as well as at design time to any Delphi application.
Working with GIF images in Delphi. Need to display an animated GIF image in a Delphi application? Even though Delphi does not natively support GIF image files formats (like BMP or JPEG) there are a few great (free source) components available on the Net, which add the ability to display and manipulate GIF images at run as well as at design time to any Delphi application.
Use Adobe Acrobat (PDF) Fil...
Let's see how to to show an adobe acrobat (.pdf) file in a delphi application.
Let's see how to to show an adobe acrobat (.pdf) file in a delphi application.
Delphi Tips 261- 264
Delphi tip: Delphi applications that use BDE for database access require that you distribute the BDE with the application. Here's how to install the BDE on a client machine using an install program or manually.
Delphi tip: Delphi applications that use BDE for database access require that you distribute the BDE with the application. Here's how to install the BDE on a client machine using an install program or manually.
Intro to the Delphi Language
An introduction to Delphi Pascal. Before you start developing more sophisticated applications by using the RAD features of Delphi, you should learn the basics of the Delphi Pascal language.
An introduction to Delphi Pascal. Before you start developing more sophisticated applications by using the RAD features of Delphi, you should learn the basics of the Delphi Pascal language.
System Tray Delphi application - Quick and Easy
Placing Delphi applications in the System Tray in easy steps. The perfect place form programs that are left running for long periods of time with no user interaction.
Placing Delphi applications in the System Tray in easy steps. The perfect place form programs that are left running for long periods of time with no user interaction.
Fundamentals of Database Development (with Delphi) - DB/1 - Page 1/2
Chapter one of the free Delphi database online course. Delphi as the database programming tool, Data Access with Delphi...just a few words, Building a new MS Access database.
Chapter one of the free Delphi database online course. Delphi as the database programming tool, Data Access with Delphi...just a few words, Building a new MS Access database.
Creating Components at RunTime
Most often when programming in Delphi you don't need to dynamically create a component. If you drop a component on a form, Delphi handles the component creation automatically when the form is created. This article will cover the correct way to programmatically create components at run-time.
Most often when programming in Delphi you don't need to dynamically create a component. If you drop a component on a form, Delphi handles the component creation automatically when the form is created. This article will cover the correct way to programmatically create components at run-time.
Understanding Class Methods
Understanding and using Borland Delphi Class procedures / functions. What they are and how to find a practical use for them.
Understanding and using Borland Delphi Class procedures / functions. What they are and how to find a practical use for them.
Adding components to a DBGrid
Adding components to a DBGrid. How to place just about any Delphi control (visual component) into a cell of a DGBrid. Find out how to put a CheckBox, a ComboBox (drop down list box), a DateTimePicker (calendar) and even an Image inside the DBGrid.
Adding components to a DBGrid. How to place just about any Delphi control (visual component) into a cell of a DGBrid. Find out how to put a CheckBox, a ComboBox (drop down list box), a DateTimePicker (calendar) and even an Image inside the DBGrid.
Your first MP3 Delphi player - part 1/4
See how to build a full-blown mp3 player with Delphi in just a few seconds. Even more: get the ID3 tag information from a mp3 file and change it!
See how to build a full-blown mp3 player with Delphi in just a few seconds. Even more: get the ID3 tag information from a mp3 file and change it!
Accessing and managing MS Excel sheets with Delphi (Page 2/7)
Accessing and managing MS Excel sheets with Delphi. How to retrieve, display and edit Microsoft Excel spreadsheets with ADO (dbGO) and Delphi. This step-by-step article describes how to connect to Excel, retrieve sheet data, and enable editing of data (using the DBGrid). You'll also find a list of most common errors (and how to deal with them) that might pop up in the process.
Accessing and managing MS Excel sheets with Delphi. How to retrieve, display and edit Microsoft Excel spreadsheets with ADO (dbGO) and Delphi. This step-by-step article describes how to connect to Excel, retrieve sheet data, and enable editing of data (using the DBGrid). You'll also find a list of most common errors (and how to deal with them) that might pop up in the process.
Sorting records in Delphi DBGrid by Clicking on Column Title
Sorting records in Delphi DBGrid. How to sort records in Delphi DbGrid by clicking on the column title. Plus: how to change the appearance of the selected column title to reflect the sort order. Even more: how to change the cursor when moving over the DBGrid column titles.
Sorting records in Delphi DBGrid. How to sort records in Delphi DbGrid by clicking on the column title. Plus: how to change the appearance of the selected column title to reflect the sort order. Even more: how to change the cursor when moving over the DBGrid column titles.
Reading RSS (XML) Feeds
Learn how to read and manipulate XML documents with Delphi using the TXMLDocument component. Let's see how to extract the most current "In The Spotlight" blog entries from the About Delphi Programming (this site).
Learn how to read and manipulate XML documents with Delphi using the TXMLDocument component. Let's see how to extract the most current "In The Spotlight" blog entries from the About Delphi Programming (this site).
Queries with ADO - DB/7
Chapter seven of the free Delphi Database Course for beginners. Take a look at how you can take advantage of the TADOQuery component to boost your ADO-Delphi productivity.
Chapter seven of the free Delphi Database Course for beginners. Take a look at how you can take advantage of the TADOQuery component to boost your ADO-Delphi productivity.
Access / SQL Server Database Explorer with full Delphi source code
The ADPDBExplorer (About Delphi Programming Database Explorer) application allows you to connect to a Microsoft Access (MDB) database and/or SQL Server / MSDE database to explore a database structure, insert, edit or delete data. Features also include running 'free-hand' queries (select, insert, update, etc.) against the database using a simple query builder. A simple master-details relationships builder allows displaying and operating on joined tables.
The ADPDBExplorer (About Delphi Programming Database Explorer) application allows you to connect to a Microsoft Access (MDB) database and/or SQL Server / MSDE database to explore a database structure, insert, edit or delete data. Features also include running 'free-hand' queries (select, insert, update, etc.) against the database using a simple query builder. A simple master-details relationships builder allows displaying and operating on joined tables.
Delphi Tips 193 - 196
Delphi tip: Correct date format for SQL
Delphi tip: Correct date format for SQL
BPL vs. DLL
An overview of creating and using 'Borland Package Libraries' and how they compare with 'Dynamic Link Libraries' in creating smaller Delphi applications.
An overview of creating and using 'Borland Package Libraries' and how they compare with 'Dynamic Link Libraries' in creating smaller Delphi applications.
Understanding Delphi SETs
One of the Delphi language features not found in other modern languages is the notion of sets. Delphi's set type is a collection of values of the same ordinal type. Learn about Delphi sets to better understand Delphi source code.
One of the Delphi language features not found in other modern languages is the notion of sets. Delphi's set type is a collection of values of the same ordinal type. Learn about Delphi sets to better understand Delphi source code.
Custom Component Development
Everything about creating custom components in Delphi. The ultimate source.
Everything about creating custom components in Delphi. The ultimate source.
Pictures inside a database - DB/3 - Page 1/5
Chapter three of the free Delphi database online course. Displaying images (BMP, JPEG, ...) inside an Access database with ADO and Delphi.
Chapter three of the free Delphi database online course. Displaying images (BMP, JPEG, ...) inside an Access database with ADO and Delphi.
Fundamentals of Database Development (with Delphi) - DB/1 - Page 2/2
Chapter one of the free Delphi database online course.
Chapter one of the free Delphi database online course.
Go MySQL
An overview of VCL components allowing you to access a MySQL database from Delphi using standard data controls without using BDE/ADO/ODBC. Plus a few MYSQL related tools.
An overview of VCL components allowing you to access a MySQL database from Delphi using standard data controls without using BDE/ADO/ODBC. Plus a few MYSQL related tools.
Using TRegistry
Some basic facts and code samples on using Delphi and the Windows Registry database.
Some basic facts and code samples on using Delphi and the Windows Registry database.
Introducing Borland Delphi - Page 2/3
A Beginner’s Guide to Delphi Programming: Chapter 1. What is Borland Delphi? Where to download a free version, how to install and configure it.
A Beginner’s Guide to Delphi Programming: Chapter 1. What is Borland Delphi? Where to download a free version, how to install and configure it.
Exporting a TreeView to XML. Populating a TreeView from XML
Here's how to store TTreeView component items to XML (preserving the Text and other properties of a tree node) and how to populate a TreeView from an XML file.
Here's how to store TTreeView component items to XML (preserving the Text and other properties of a tree node) and how to populate a TreeView from an XML file.
Keyboard Hook For Components
Intercepting keyboard input for controls that cannot receive the input focus. Working with keyboard hooks in Delphi.
Intercepting keyboard input for controls that cannot receive the input focus. Working with keyboard hooks in Delphi.
Accessing and managing MS Excel sheets with Delphi (Page 3/7)
Accessing and managing MS Excel sheets with Delphi. How to retrieve, display and edit Microsoft Excel spreadsheets with ADO (dbGO) and Delphi. This step-by-step article describes how to connect to Excel, retrieve sheet data, and enable editing of data (using the DBGrid). You'll also find a list of most common errors (and how to deal with them) that might pop up in the process.
Accessing and managing MS Excel sheets with Delphi. How to retrieve, display and edit Microsoft Excel spreadsheets with ADO (dbGO) and Delphi. This step-by-step article describes how to connect to Excel, retrieve sheet data, and enable editing of data (using the DBGrid). You'll also find a list of most common errors (and how to deal with them) that might pop up in the process.
Chat application with Delphi source
Full Delphi source code to a simple Chat application. Learn how UDP (User Datagram Protocol) broadcast can be used to find partners with unknown IP addresses in the network.
Full Delphi source code to a simple Chat application. Learn how UDP (User Datagram Protocol) broadcast can be used to find partners with unknown IP addresses in the network.
Synchronizing Threads and GUI
Multi-threading in Delphi lets you create applications that include several simultaneous paths of execution. When several threads are running in the application a question arises: how to update your GUI (user interface) as a result of a thread execution. The question lies in the TThread class Synchronize method.
Multi-threading in Delphi lets you create applications that include several simultaneous paths of execution. When several threads are running in the application a question arises: how to update your GUI (user interface) as a result of a thread execution. The question lies in the TThread class Synchronize method.
A journey through the Delphi IDE - Page 1/2
A quick journey through the main parts and tools of the Delphi integrated development environment.
A quick journey through the main parts and tools of the Delphi integrated development environment.
Connecting to a database. BDE? ADO? - DB/2 - Page 4/4
Chapter two of the free Delphi database online course.
Chapter two of the free Delphi database online course.
Web Forms navigation in ASP.NET - Part 1
Web Forms navigation in ASP.NET - Part 1. Exploring navigation techniques between Web Form pages: postbacks, direct navigation (using the <a> tag) and code-based navigation (using Server.Transfer and Response.Redirect).
Web Forms navigation in ASP.NET - Part 1. Exploring navigation techniques between Web Form pages: postbacks, direct navigation (using the <a> tag) and code-based navigation (using Server.Transfer and Response.Redirect).
Send Data to Another App.
Learn how to send the WM_CopyData message between two Delphi applications to exchange information and make two applications communicate. The accompanying source code demonstrates how to send a string, record (complex data type) and even graphics to another application.
Learn how to send the WM_CopyData message between two Delphi applications to exchange information and make two applications communicate. The accompanying source code demonstrates how to send a string, record (complex data type) and even graphics to another application.
Virtual Key Code To Character
Windows defines special constants for each key the user can press. The virtual-key codes identify various virtual keys. In Delphi, the OnKeyDown and OnKeyUp events provide the lowest level of keyboard response. To use OnKeyDown or OnKeyUp to test for keys the user presses, you must use Virtual key codes to get the key pressed. Here's how to translate the virtual key code to the corresponding Windows character.
Windows defines special constants for each key the user can press. The virtual-key codes identify various virtual keys. In Delphi, the OnKeyDown and OnKeyUp events provide the lowest level of keyboard response. To use OnKeyDown or OnKeyUp to test for keys the user presses, you must use Virtual key codes to get the key pressed. Here's how to translate the virtual key code to the corresponding Windows character.
Streams, streams, ... TStream
Streams, streams, ... TStream. A stream is what its name suggests: a flowing river of data. A stream has a beginning, an end, and you're always somewhere in between of these two points. Learn about using the TStream class in Delphi: how to use stream objects to read from, write to, or copy information stored in a particular medium.
Streams, streams, ... TStream. A stream is what its name suggests: a flowing river of data. A stream has a beginning, an end, and you're always somewhere in between of these two points. Learn about using the TStream class in Delphi: how to use stream objects to read from, write to, or copy information stored in a particular medium.
ScreenThief - stealing screen shots over the Network
A free network screen shot grabber application, with source code. Learn how to send / receive raw (binary) data (screen shot images) using TCP connections.
A free network screen shot grabber application, with source code. Learn how to send / receive raw (binary) data (screen shot images) using TCP connections.
Two Strings in ListBox
There are situations when you want to display a list of strings to the user, for example in the list box control, but also have a way to store one more additional string (or event an object instance) along the one displayed to the user. Here's how when using Delphi.
There are situations when you want to display a list of strings to the user, for example in the list box control, but also have a way to store one more additional string (or event an object instance) along the one displayed to the user. Here's how when using Delphi.
Delphi Tips 133 - 136
Delphi tis: Get computer name, Get Windows user name
Delphi tis: Get computer name, Get Windows user name
Delphi ZIP (Compress) VCL-s
A selected collection of open source, free, and commercial Delphi components to help you add ZIP / UNZIP functionality to your application. Compressing and deflating files and directories in well-known formats like ZIP, RAR, TAR, GZIP, CAB will not longer be a missing piece in your Delphi projects!
A selected collection of open source, free, and commercial Delphi components to help you add ZIP / UNZIP functionality to your application. Compressing and deflating files and directories in well-known formats like ZIP, RAR, TAR, GZIP, CAB will not longer be a missing piece in your Delphi projects!
Connecting to a database. BDE? ADO? - DB/2 - Page 2/4
Chapter two of the free Delphi database online course.
Chapter two of the free Delphi database online course.
TColorButton - button with color properties
TColorButton - button with color properties. Full source code of the TColorButton Delphi component, an extension to the standard TButton control, with font color, background color and mouse over color properties.
TColorButton - button with color properties. Full source code of the TColorButton Delphi component, an extension to the standard TButton control, with font color, background color and mouse over color properties.
Uploading files to a web server with ASP.Net
Let's enable uploading of binary files from a client browser to the web server in ASP.Net web applications. Delphi for .Net and ASP.NET provide an easy way to accept files from the client using HTMLInputFile ('HTML File Upload' HTML server control) and HTTPPostedFile classes.
Let's enable uploading of binary files from a client browser to the web server in ASP.Net web applications. Delphi for .Net and ASP.NET provide an easy way to accept files from the client using HTMLInputFile ('HTML File Upload' HTML server control) and HTTPPostedFile classes.
Enter key := Tab key
Pressing the Tab key moves the input focus to next control and Shift-Tab to previous in the tab order of the form. When working with Windows applications, most users intuitively expect the Enter key to behave like a Tab key.
Pressing the Tab key moves the input focus to next control and Shift-Tab to previous in the tab order of the form. When working with Windows applications, most users intuitively expect the Enter key to behave like a Tab key.
What does #13#10 stand for?
You've certainly seen "#13#10" many times in Delphi source code. If you are wondering what those character stand for, here's the answer...
You've certainly seen "#13#10" many times in Delphi source code. If you are wondering what those character stand for, here's the answer...
Delphi: "File Of Type"
Working with binary files from Delphi. Use Delphi to manage writing, reading and updating your own types of files.
Working with binary files from Delphi. Use Delphi to manage writing, reading and updating your own types of files.
Splash Screens
How to add a splash screen to your Delphi application
How to add a splash screen to your Delphi application
Keyboard Hooks (with Example)
This document describes what Windows hooks are and how to use them within a Delphi application.
This document describes what Windows hooks are and how to use them within a Delphi application.
Compiler Version Directives
Preparing to code with no barriers. See how to overcome the compiler version problem: compiling Delphi code for various Delphi versions.
Preparing to code with no barriers. See how to overcome the compiler version problem: compiling Delphi code for various Delphi versions.
MDI Development in Delphi. Part I.
Constructing 'multiple document interface' application with Delphi. Examining MDI parent/child relationship, menus and some most important MDI parent form properties.
Constructing 'multiple document interface' application with Delphi. Examining MDI parent/child relationship, menus and some most important MDI parent form properties.
Drawing an image in a cell of a Delphi DBGrid
Here's how to place an image into a cell of a TDBGrid. Enrich the visual presentation of data in Delphi database applications.
Here's how to place an image into a cell of a TDBGrid. Enrich the visual presentation of data in Delphi database applications.
Constructing the Database Connection String Dynamically at Run Time (in Delphi ADO applications)
When creating Delphi database applications that are to be run on various machines, the connection to the data source should not be hard-coded in the executable. This article (with the sample project) shows how to store database connection parameters (server and database name) in Registry and how to build the ConnectionString dynamically.
When creating Delphi database applications that are to be run on various machines, the connection to the data source should not be hard-coded in the executable. This article (with the sample project) shows how to store database connection parameters (server and database name) in Registry and how to build the ConnectionString dynamically.
Delphi OOP Course - Into
Free online Borland Delphi OOP Course: Chapter Overview.
Free online Borland Delphi OOP Course: Chapter Overview.
Advanced Mouse Processing
More sophisticated Mouse techniques. Is mouse Present? Handling OnMouseEnter, OnMouseLeave. Restrict movement, Set Position, Faking clicks, etc.
More sophisticated Mouse techniques. Is mouse Present? Handling OnMouseEnter, OnMouseLeave. Restrict movement, Set Position, Faking clicks, etc.
IF & Case Statements in Delphi
If you want to control the flow of code execution depending on what the program has already done or what it has just encountered you need to use one of the two Delphi Pascal branching statements: if statements and case statements. Learn how.
If you want to control the flow of code execution depending on what the program has already done or what it has just encountered you need to use one of the two Delphi Pascal branching statements: if statements and case statements. Learn how.
Listing Windows processes
Listing Windows processes. Getting a list of Window processes and setting memory for return values using Delphi.
Listing Windows processes. Getting a list of Window processes and setting memory for return values using Delphi.
Dialog and Message routines - Delphi Programming
Command line utilities: rtl reference input dialog message dialog delphi programming ok button
Command line utilities: rtl reference input dialog message dialog delphi programming ok button
Using ADO in a Delphi
Data access using Microsoft's ActiveX Data Objects (ADO) with Delphi. Find out what ADO brings to a Delphi developer, how to work with ADO and what are the best ADO components for Delphi.
Data access using Microsoft's ActiveX Data Objects (ADO) with Delphi. Find out what ADO brings to a Delphi developer, how to work with ADO and what are the best ADO components for Delphi.
Delphi Tips 265 - 268
Delphi tip: If you need to work with dynamically created TXMLDocument component, you might be getting access violations once you try to Free the object. Here's what to do ...
Delphi tip: If you need to work with dynamically created TXMLDocument component, you might be getting access violations once you try to Free the object. Here's what to do ...
Records in Delphi - Part 2
Records in Delphi - Part 2. Why and when to use variant records, plus creating an array of records.
Records in Delphi - Part 2. Why and when to use variant records, plus creating an array of records.
Project Files (.DPR)
Delphi organizes applications into what is called projects. A project is made up of the visual interface along with the code that activates the interface. Each project can have multiple forms, allowing us to build applications that have multiple windows. Find out about Delphi's Project File in this article!
Delphi organizes applications into what is called projects. A project is made up of the visual interface along with the code that activates the interface. Each project can have multiple forms, allowing us to build applications that have multiple windows. Find out about Delphi's Project File in this article!
How to Move and Resize Controls at Run Time (in Delphi applications)
While in most situations you will arrange all the controls on a Delphi form in a 'fixed' position, there are situations where you need to allow a user to change the placement and dimension of controls at run-time. Here's how to enable dragging and resizing controls with mouse, while the application is running.
While in most situations you will arrange all the controls on a Delphi form in a 'fixed' position, there are situations where you need to allow a user to change the placement and dimension of controls at run-time. Here's how to enable dragging and resizing controls with mouse, while the application is running.
Connecting to a database. BDE? ADO? - DB/2 - Page 3/4
Chapter two of the free Delphi database online course.
Chapter two of the free Delphi database online course.
Your First MDI Delphi Project
Learn how to create a powerful 'multiple document interface' application using Delphi. A Beginner's Guide to Delphi Programming: Chapter 11.
Learn how to create a powerful 'multiple document interface' application using Delphi. A Beginner's Guide to Delphi Programming: Chapter 11.
User / Application Data Folder
When in the need of storing some content related to your Delphi application on the user's hard disk, you should take care of the support for state separation of user data, user settings, and computer settings.
When in the need of storing some content related to your Delphi application on the user's hard disk, you should take care of the support for state separation of user data, user settings, and computer settings.
Birth, Life, Death of a Form
Examining the life cycle of a Delphi Form - the central element of development in Delphi. See what's happening behind events OnCreate, OnActivate, OnShow, OnClose...
Examining the life cycle of a Delphi Form - the central element of development in Delphi. See what's happening behind events OnCreate, OnActivate, OnShow, OnClose...
What's New In Delphi 2010
August 2009, Embarcadero releases Rad Studio 2010 - rapid application development suite including Delphi 2010, C++Builder 2010 and Delphi Prism 2010. This article lists new features in Delphi 2010 for Win32 development.
August 2009, Embarcadero releases Rad Studio 2010 - rapid application development suite including Delphi 2010, C++Builder 2010 and Delphi Prism 2010. This article lists new features in Delphi 2010 for Win32 development.
Registering DLL and ActiveX controls from code
How to register (and unregister) OLE controls such as dynamic-link library (DLL) or ActiveX Controls (OCX) files from a Delphi application.
How to register (and unregister) OLE controls such as dynamic-link library (DLL) or ActiveX Controls (OCX) files from a Delphi application.
Handling Errors and Exceptions
Unfortunately, building applications includes coding. Regardless of how carefully you write/debug your program, it will be impossible to imagine every situation that can go wrong. Learn how to handle errors and exceptions in Delphi applications.
Unfortunately, building applications includes coding. Regardless of how carefully you write/debug your program, it will be impossible to imagine every situation that can go wrong. Learn how to handle errors and exceptions in Delphi applications.
Owner vs, Parent
The differences between a Delphi component Owner and its Parent - briefly explained. Plus: when to use the Controls and Component properties of a Delphi component.
The differences between a Delphi component Owner and its Parent - briefly explained. Plus: when to use the Controls and Component properties of a Delphi component.
Borland Delphi 7 Studio
Borland Delphi 7 Studio: Released! Extra, Extra, read all about it! All about NEW features in the next generation design-to-deploy e-business development tool: Borland Delphi 7 Studio.
Borland Delphi 7 Studio: Released! Extra, Extra, read all about it! All about NEW features in the next generation design-to-deploy e-business development tool: Borland Delphi 7 Studio.
Your first MP3 Delphi player - part 2/4
See how to build a full-blown mp3 player with Delphi in just a few seconds. Even more: get the ID3 tag information from a mp3 file and change it!
See how to build a full-blown mp3 player with Delphi in just a few seconds. Even more: get the ID3 tag information from a mp3 file and change it!
Data filtering - DB/8
Chapter eight of the free Delphi Database Course for beginners. Using Filters to narow the scope of data that is presented to the user.
Chapter eight of the free Delphi Database Course for beginners. Using Filters to narow the scope of data that is presented to the user.
TreeView with check boxes and radio buttons
TreeView with check boxes and radio buttons. Here's how to add check boxes and radio buttons to a TTreeView Delphi component. Give your applications a more professional and smoother look.
TreeView with check boxes and radio buttons. Here's how to add check boxes and radio buttons to a TTreeView Delphi component. Give your applications a more professional and smoother look.
Create(Nil, Self, Application)
When creating Delphi objects dynamically, that inherit from TControl, such as a TForm (representing a window) in Delphi application, the constructor "Create" expects an Owner parameter. Should you use "nil", "self" or "Application"? Find here...
When creating Delphi objects dynamically, that inherit from TControl, such as a TForm (representing a window) in Delphi application, the constructor "Create" expects an Owner parameter. Should you use "nil", "self" or "Application"? Find here...
Delphi Tips 109 - 112
Delphi tip: Get EXE Version Information
Delphi tip: Get EXE Version Information
Anatomy of a Delphi Unit (Delphi For Beginners)
Delphi For Beginners: Interface, Implementation, Initialization, Finalization, Uses and other funny words.
Delphi For Beginners: Interface, Implementation, Initialization, Finalization, Uses and other funny words.
Open and Save - Creating Notepad
Working with common dialog boxes: Open and Save. How to create my own Notepad using Delphi. Part 1.
Working with common dialog boxes: Open and Save. How to create my own Notepad using Delphi. Part 1.
ADO + mySQL ConnectionString
If your database choice is mySQL and you are using dbGO (ADO) components, over the mySQL ODBC 3.51 driver, this is how your TADOConnection's ConnectionString property should look ...
If your database choice is mySQL and you are using dbGO (ADO) components, over the mySQL ODBC 3.51 driver, this is how your TADOConnection's ConnectionString property should look ...
Delphi Tips 269 - 272
How to simulate keyboard usage using Delphi code.
How to simulate keyboard usage using Delphi code.
Displaying and editing MEMO fiels in Delphi's TDBGrid
Here's how to show the contents of a MEMO (textual BLOB) field in a TDBGrid. Plus: how to enable editing of a TMemoField's contents using a separate window.
Here's how to show the contents of a MEMO (textual BLOB) field in a TDBGrid. Plus: how to enable editing of a TMemoField's contents using a separate window.
Copy function
Delphi's Copy function returns a substring of a string or a segment of a dynamic array.
Delphi's Copy function returns a substring of a string or a segment of a dynamic array.
AI Delphi Game Example
A Simple example of Artificial Intelligence using Delphi. The article explores Delphi approach to AI, using the pebble picking game. A simple game is used to show how computer can learn by correcting mistakes.
A Simple example of Artificial Intelligence using Delphi. The article explores Delphi approach to AI, using the pebble picking game. A simple game is used to show how computer can learn by correcting mistakes.
An introduction to server-side HTML controls and HTML tags in ASP.NET applications
Taking a look at the use of standard HTML tags and elements and the use of server-side HTML controls - from a perspective of a Delphi developer.
Taking a look at the use of standard HTML tags and elements and the use of server-side HTML controls - from a perspective of a Delphi developer.
My IP with Delphi
How to obtain a computer's IP address by using the Socket API and Delphi's Pascal.
How to obtain a computer's IP address by using the Socket API and Delphi's Pascal.
Delphi Programming Tips 25 ...
Delphi tip: Left, Mid, Right String
Delphi tip: Left, Mid, Right String
Using Callback Functions
Simply put, a callback function is a routine in your program that Windows calls. A good example of a Windows API functions that require callback functions are enumeration functions. LEarn how to use Windows Callback in Delphi applications.
Simply put, a callback function is a routine in your program that Windows calls. A good example of a Windows API functions that require callback functions are enumeration functions. LEarn how to use Windows Callback in Delphi applications.
Your first MP3 Delphi player - part 3/4
See how to build a full-blown mp3 player with Delphi in just a few seconds. Even more: get the ID3 tag information from a mp3 file and change it!
See how to build a full-blown mp3 player with Delphi in just a few seconds. Even more: get the ID3 tag information from a mp3 file and change it!
Database Multithreading
To speed up data processing, for example, fetching data from the database to create reports, you can add an additional thread to fetch and operate on the result (recordset). Learn about the traps in writing Multithreaded Delphi Database Queries with dbGo (ADO).
To speed up data processing, for example, fetching data from the database to create reports, you can add an additional thread to fetch and operate on the result (recordset). Learn about the traps in writing Multithreaded Delphi Database Queries with dbGo (ADO).
Creating your first 'Hello World' Delphi Application - Page 2/3
An overview of application development with Delphi, including creating a simple project, writing code, compiling and running a project. Also, find out how to ask Delphi for help.
An overview of application development with Delphi, including creating a simple project, writing code, compiling and running a project. Also, find out how to ask Delphi for help.
Alternate Row Color in DBGrid
You've seen this surely on web pages. Alternating table row colors means displaying the first record in one color and the second record in another color and continue to alternate the color of each row displayed. Here's the OnDrawColumnCell event handler for a Delphi DBGrid control to color every second row in a different color.
You've seen this surely on web pages. Alternating table row colors means displaying the first record in one color and the second record in another color and continue to alternate the color of each row displayed. Here's the OnDrawColumnCell event handler for a Delphi DBGrid control to color every second row in a different color.
Add !DocType to a XMLDocument
Delphi's implementation of the TXMLDocument component, which basically uses Microsoft XML parser by default, does not provide a way to add a node of the "ntDocType" (TNodeType type). Here's how to solve this problem.
Delphi's implementation of the TXMLDocument component, which basically uses Microsoft XML parser by default, does not provide a way to add a node of the "ntDocType" (TNodeType type). Here's how to solve this problem.
MD5 Hashing in Delphi
The MD5 Message-Digest algorithm is a cryptographic hash function. MD5 is commonly used to check the integrity of files. An MD5 hash value is a 32 digit hexadecimal number. Using Delphi, you can easily create a function to calculate the MD5 hash for a given file.
The MD5 Message-Digest algorithm is a cryptographic hash function. MD5 is commonly used to check the integrity of files. An MD5 hash value is a 32 digit hexadecimal number. Using Delphi, you can easily create a function to calculate the MD5 hash for a given file.