Pascal (Lazarus/Delphi)

Decompress Bytes

See more Compression Examples

Demonstrates how to decompress binary data. 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.Compression,
  Chilkat.FileAccess;

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

procedure RunDemo;
var
  success: Boolean;
  fac: TFileAccess;
  compressedBytes: TBytes;
  compress: TCompression;
  decompressedBytes: TBytes;

begin
  success := False;

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

  //  See this example to compress bytes: Compress Bytes

  fac := TFileAccess.Create;

  compressedBytes := fac.ReadEntireFile('qa_data/compressed/compressedBmp.dat');
  if (fac.LastMethodSuccess <> True) then
    begin
      WriteLn(fac.LastErrorText);
      Exit;
    end;

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

  decompressedBytes := compress.DecompressBytes(compressedBytes);
  if (compress.LastMethodSuccess <> True) then
    begin
      WriteLn(compress.LastErrorText);
      Exit;
    end;

  success := fac.WriteEntireFile('qa_output/decompressed.bmp',decompressedBytes);
  if (fac.LastMethodSuccess <> True) then
    begin
      WriteLn(fac.LastErrorText);
      Exit;
    end;


  fac.Free;
  compress.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.