1. Technology

File Size - Get the Size of a File in Bytes using Delphi


When working with files and folders from a Delphi application you sometimes need to know what is the size of a file (in bytes).

Get File Size

The FileSize function returns the size of a file in bytes, -1 if the file was not found.
 // returns file size in bytes or -1 if not found.
 function FileSize(fileName : wideString) : Int64;
   sr : TSearchRec;
   if FindFirst(fileName, faAnyFile, sr ) = 0 then
      result := Int64(sr.FindData.nFileSizeHigh) shl Int64(32) + Int64(sr.FindData.nFileSizeLow)
      result := -1;
   FindClose(sr) ;
Note: when you have the size of a file in bytes, you might want to format the size for display (Kb, Mb, Gb)

Delphi tips navigator:
» Get the Application associated with the Shell Print Command for a File Type from Delphi
« Class Helper for Delphi's TStrings: Implemented Add(Variant)

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