Pascal (Lazarus/Delphi)

REST Download Binary File to Memory

See more REST Examples

Download a binary file to a Chilkat BinData object. 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.Rest,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  pathPartOfUrl: string;
  domain: string;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  bd: TBinData;
  sbErrorText: TStringBuilder;

begin
  success := False;

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

  rest := TRest.Create;

  //  We're going to download a sample MS-Word doc file.
  //  The URLs of our MS-Word sample documents are:

  //  https://www.chilkatdownload.com/sample_data/sample.doc
  //  https://www.chilkatdownload.com/sample_data/sample.docx

  pathPartOfUrl := '/sample_data/sample.doc';
  domain := 'chilkatdownload.com';

  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect(domain,port,bTls,bAutoReconnect);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  bd := TBinData.Create;
  success := rest.FullRequestNoBodyBd('GET',pathPartOfUrl,bd);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  A 200 response is expected for actual success.
  //  If we don't get a 200 response, then the response body was not actually
  //  the file data, but it was text containing error information.
  if (rest.ResponseStatusCode <> 200) then
    begin
      sbErrorText := TStringBuilder.Create;
      sbErrorText.AppendBd(bd,'utf-8',0,0);
      WriteLn(sbErrorText.GetAsString());
      WriteLn('-- Failed.');
      Exit;
    end;

  //  Save to a local file.
  //  Change the file path based on your operating system or needs...
  success := bd.WriteFile('c:/temp/qa_output/sample.doc');
  if (success <> True) then
    begin
      WriteLn('Failed to save to local file.');
      Exit;
    end;

  WriteLn('REST Download of MS-Word File was successful.');


  rest.Free;
  bd.Free;
      sbErrorText.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.