(Delphi) Deflate File

Demonstrates how to use the Deflate compression algorithm to compress a file. (The deflate compression algorithm is the most commonly used in the Zip archive file format.)

This code is capable of compressing any size file because the file data is compressed from input to output in a streaming mode. The output file contains only the deflated data (it is not a .zip, and there is no file structure or format).

Download Chilkat Compression ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATCOMPRESSIONLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
compress: TChilkatCompression;
success: Integer;

begin
compress := TChilkatCompression.Create(Self);

//  Any string argument automatically begins a 30-day trial.
success := compress.UnlockComponent('30-day trial');
if (success <> 1) then
  begin
    Memo1.Lines.Add(compress.LastErrorText);
    Exit;
  end;

compress.Algorithm := 'deflate';

//  Deflate this XML file:
success := compress.CompressFile('hamlet.xml','hamletDeflate.dat');
if (success <> 1) then
  begin
    Memo1.Lines.Add(compress.LastErrorText);
    Exit;
  end;

//  Inflate back to the original:
success := compress.DecompressFile('hamletDeflate.dat','hamletInflated.xml');
if (success <> 1) then
  begin
    Memo1.Lines.Add(compress.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Success!');
end;