Pascal (Lazarus/Delphi)

Compress Bytes to Base64 (or any other encoding)

See more Compression Examples

Compresses bytes to base64 or any other encoding. Also decompress to return the original. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.BinData,
  Chilkat.Compression;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  binData: TBinData;
  i: Integer;
  compress: TCompression;
  uncompressedBytes: TBytes;
  compressedBase64: string;
  compressedHex: string;
  binData2: TBinData;

begin
  success := False;

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

  //  First create some binary data to compress.
  binData := TBinData.Create;

  for i := 1 to 16 do
    begin
      binData.AppendEncoded('000102030405060708090A0B0C0D0E0F','hex');
    end;

  compress := TCompression.Create;
  compress.Algorithm := 'deflate';
  compress.EncodingMode := 'base64';

  uncompressedBytes := binData.GetBinary();

  //  Compress and return the compressed bytes in base64 format.
  compressedBase64 := compress.CompressBytesENC(uncompressedBytes);
  WriteLn('compressed and base64 encoded: ' + compressedBase64);

  //  Compress and return in hex format:
  compress.EncodingMode := 'hex';
  compressedHex := compress.CompressBytesENC(uncompressedBytes);
  WriteLn('compressed and hex encoded: ' + compressedHex);

  //  Now decompress..
  binData2 := TBinData.Create;

  //  Decompress the base64..
  compress.EncodingMode := 'base64';
  uncompressedBytes := compress.DecompressBytesENC(compressedBase64);
  binData2.AppendBinary(uncompressedBytes);
  //  Show the uncompressed bytes in hex format:
  WriteLn(binData2.GetEncoded('hex'));
  WriteLn('--');

  //  Decompress the hex..
  compress.EncodingMode := 'hex';
  uncompressedBytes := compress.DecompressBytesENC(compressedHex);
  binData2.Clear();
  binData2.AppendBinary(uncompressedBytes);
  //  Show the uncompressed bytes in hex format:
  WriteLn(binData2.GetEncoded('hex'));
  WriteLn('--');


  binData.Free;
  compress.Free;
  binData2.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.