(Delphi DLL) Compress Bytes

Demonstrates how to compress binary data.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
fac: HCkFileAccess;
fileBytes: HCkByteData;
compress: HCkCompression;
compressedBytes: HCkByteData;
success: Boolean;

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

fac := CkFileAccess_Create();

fileBytes := CkByteData_Create();
success := CkFileAccess_ReadEntireFile(fac,'qa_data/bmp/big.bmp',fileBytes);
if (CkFileAccess_getLastMethodSuccess(fac) <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    Exit;
  end;

compress := CkCompression_Create();
CkCompression_putAlgorithm(compress,'deflate');

compressedBytes := CkByteData_Create();
success := CkCompression_CompressBytes(compress,fileBytes,compressedBytes);
if (CkCompression_getLastMethodSuccess(compress) <> True) then
  begin
    Memo1.Lines.Add(CkCompression__lastErrorText(compress));
    Exit;
  end;

success := CkFileAccess_WriteEntireFile(fac,'qa_output/compressedBmp.dat',compressedBytes);
if (CkFileAccess_getLastMethodSuccess(fac) <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    Exit;
  end;

CkFileAccess_Dispose(fac);
CkByteData_Dispose(fileBytes);
CkCompression_Dispose(compress);
CkByteData_Dispose(compressedBytes);

end;