Delphi language, IDE tips, techniques and articles. Every programming aspect of Delphi is uncovered: OOP, Threading, File IO, RTL, VCL ...
When programming an event handler in Delphi (like the OnClick event of a TButton), there comes the time when your application needs to be busy for a while, e.g. the code needs to write a big file or compress some data. If you do that you'll notice that your application seems to be locked. Your form cannot be moved anymore and the buttons are showing no sign of life. It seems to be crashed. Application.ProcessMessages might come as a rescue, but you need to know its dark side!
The links to all of your favorite tutorials, articles, VCL top picks, tool reviews, technical tips on Delphi Programming and a lot more, sorted by date. Year 2009.
The links to all of your favorite tutorials, articles, VCL top picks, tool reviews, technical tips on Delphi Programming and a lot more, sorted by date. Year 2008.
The links to all of your favorite tutorials, articles, VCL top picks, tool reviews, technical tips on Delphi Programming and a lot more, sorted by date. Year 1998.
The links to all of your favorite tutorials, articles, VCL top picks, tool reviews, technical tips on Delphi Programming and a lot more, sorted by date. Year 1999.
The links to all of your favorite tutorials, articles, VCL top picks, tool reviews, technical tips on Delphi Programming and a lot more, sorted by date. Year 2000.
The links to all of your favorite tutorials, articles, VCL top picks, tool reviews, technical tips on Delphi Programming and a lot more, sorted by date. Year 2001.
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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.
With the inclusion of [b]anonymous methods[/b] in Delphi 2009, Delphi language has a new weapon in its "what a routine can do and be used for, and how" arsenal. Here's an overview of how and when and for what you can use various "types" of Delphi routines: functions and procedures, function and procedure pointers, methods and method pointers, anounymous methods...
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.
Delphi programming is the mutts nuts. You can start off not knowing anything about programming, within 1 hour you can write a program and at the end, still know nothing about programming :-) If you want to be a (professional) software developer and your programming environment is Delphi - you'll need a few extra tools to help you get from the "I have an idea" to the full blown Delphi build application.
The second law of thermodynamics, in short version and when read by a programmer, states that "any collection of objects tends not to be sorted". Have you ever asked yourself: why there is no "UnQuickSort" method? Here's how to randomize elements of a list or collection in Delphi.
One of the common problems in programming is to sort an array of values in some order (ascending or descending). While there are many "standard" sorting algorithms, QuickSort is one of the fastest. Quicksort sorts by employing a divide and conquer strategy to divide a list into two sub-lists. Here's a Delphi implementation.
When developing applications that need to operate on files and directories it is a common task to, for example, get the list of all sub-directories for a given directory, check if a directory is empty or delete a directory. Here's a list of directory-related Delphi routines with source code examples.
One method of generating a long password, without storing it anywhere is to select a file (either binary or text), do a little bit of processing on it then force the resulting values into the ASCII range 32-127 and output them as characters. Here's how to do it in Delphi.
Preparing to code with no barriers. See how to overcome the compiler version problem: compiling Delphi code for various Delphi versions.
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.
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.
An introduction to pointer data type in Delphi. What are pointers, why, when and how to use them.
An overview of creating and using 'Borland Package Libraries' and how they compare with 'Dynamic Link Libraries' in creating smaller Delphi applications.
Help yourself, increase your productivity and simplify coding using functions and procedures built into Delphi.
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.
Extending Delphi functions and procedures with default (optional) parameters and method overloading.
In a Delphi event handler, the Sender parameter indicates which component received the event and therefore called the handler. Find out how to exploit the powers of the Sender parameter: share event handlers and more.
Components like TDateTimePicker and similar that are designed specifically for entering dates or times are useful when we want some visual representation of a date. However, why bother with visual components that are 'not-so-input-friendly when everything we want is just one Edit box to type the date into.
In this article you will find one great function designed to make date processing a bit faster.
Recursion is a general method of solving problems by reducing them to simpler problems of a similar type. A recursive subroutine constantly calls itself, each time in a simpler situation, until it gets to the trivial case, at which point it stops. Learn how to write recursive functions in Delphi.
A sample code to convert (depending on the real type used) positive and negative real values up to 1.00E18 to the English words. The return value can represent either currency or numerals. For example 1234.567 will be returned as either "one thousand, two hundred and thirty four dollars and fifty six cents". Full Delphi source code included.
To create a self-extractor, you need a special little .exe called a *stub*. This stub gets pulled into the final .exe (self-extracting) file and does the extraction work for you. Learn how to build one using Delphi.
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.
Understanding and using Borland Delphi Class procedures / functions. What they are and how to find a practical use for them.
About Delphi Programming site (http://delphi.about.com) proudly presents: Delphi language reference (with code samples).
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)
How to make sure that the Murphy's law: "Any program will expand to fill available memory" does not apply to your Delphi applications.
Useful tips to make your Delphi programs run faster.
Use some magic to extend and enhance the way you work with the Delphi IDE
This article is intended for those Delphi developers who want to know more about issues on protection from any unauthorized usage.
Gems: How to execute a method (procedure/function) by name, Incompatible type: 'method pointer and regular procedure' - explained, Simulating keystrokes from code, and many more...
Routines for converting Int to Bin, Int to Hex, Int to Roman and vice versa.
Preparing to code with no barriers. See how to overcome the compiler version problem: compiling Delphi code with various Delphi versions.
How to "run-once enable" a Delphi application that can check for its previous (running) instance. Along the process, several techniques of implementing such a check will be discussed; as well as how to bring your already running application to the foreground, if a user tries to run it "one more time".
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).
Class procedures/functions. What they are and how to find a practical use for them.
Looking for some hidden fun in Delphi? Find out what are Easter Eggs and how to add them to your applications.
Using the Enter key like a Tab key with Delphi controls
How to handle errors and exceptions in Delphi.
Delphi has always included a built-in assembler, but how to use it? This article, sought to introduce a subset of 8086 instructions and show, by example, how they might be used.
Access violations, invalid page faults, general protection faults; the name changes, but the nature of the problem is always the same. Find the solution to your Delphi AVs.
How does Google work its magic? Word indexing and document searches with Delphi.
Backtracking is used to solve problems with tree structures.
Creating a Compressed, Self-Extracting Installation File.
How code reuse can be achieved, with aggregated Delphi interfaces. Using interfaces instead of classes is harder than just learning some new syntax. It requires a different way of thinking.
Learn how to write clean and maintainable single-source code across Win32, the Microsoft .NET Framework, and Linux without simply IFDEFing everything
A collection of open source code libaries: AnsiString functions; Utility functions for Integer, Float, Bit, CharSet and Dynamic array manupilation; Date and Time functions; System specific (CPU or Operating System)...
Incorporating that Help file into your application.
This article provides step-by-step instructions on how to promote an existing relational database, including existing data, and how to provide a Unified Modeling Language (UML) class diagram representation of this.
This article provides an overview of several of the new features found in Delphi 2005: For-in-do loop, Function and procedure inlining, Multi-unit namespaces, Dynamic multidimensional arrays, Delphi Win32 Language Enhancements, etc.
Exceptions are both powerful and very misunderstood. This talk will cover exceptions from top to bottom including their purpose, proper use, and the development of your own exceptions
Grouping Delphi UI elements together in true, object-oriented containers has been tried several ways as Delphi has evolved
A recursive implementation of a numbers-to-letters function for the English language.
Explains how and why you should create a template project. This can save you a lot of time whenever you begin a new Delphi project, as the normal "setup work" you do will already be done--setting properties, adding forms and units, etc.
Generating random numbers with Delphi within a range (for example, between 0 and 100).
Delphi's docking machinery is both broad and deep, but unfortunately the documentation is neither. Here are the high points, and some docking wisdom born of hard-won experience.
Here's a quick guide to implementing C++-like templates in Object Pascal
Creating a class to access RAR archives.
Non-breaking breakpoints are breakpoints that do not load Delphi's integrated debugger when they trigger. These special breakpoints are more powerful than they sound, and this article explains why.
Are you fed up of writing yet another routine to search a stringlist? Do you know about procedural types? A procedural type is a native Pascal data type of which you may not have heard, but which you are undoubtedly using.
"Many programmers today associate assembler with a difficult, low-level kind of programming. They consider it fast, but most of them also think it is incomprehensible and impossible to learn. In reality, things are not that bad..."
Tired of always having Delphi integrated debugger load when an exception is raised? It doesn't have to be that way, and this article shows you how in Delphi 7, Delphi 8, and Kylix.
