Delphi ActiveX

Compress Bytes

See more Compression Examples

Demonstrates how to compress binary data. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
fac: TCkFileAccess;
fileBytes: Array of Byte;
compress: TChilkatCompression;
compressedBytes: Array of Byte;

begin
success := 0;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

fac := TCkFileAccess.Create(Self);

fileBytes := fac.ReadEntireFile('qa_data/bmp/big.bmp');
if (fac.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(fac.LastErrorText);
    Exit;
  end;

compress := TChilkatCompression.Create(Self);
compress.Algorithm := 'deflate';

compressedBytes := compress.CompressBytes(fileBytes);
if (compress.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(compress.LastErrorText);
    Exit;
  end;

success := fac.WriteEntireFile('qa_output/compressedBmp.dat',compressedBytes);
if (fac.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(fac.LastErrorText);
    Exit;
  end;
end;