Set a Multipart Part Body from a Stream

See more REST Examples

Demonstrates Rest.SetMultipartBodyStream, which uses a Stream as the body source for the selected multipart part.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

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.Stream,
  Chilkat.Rest;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  bAutoReconnect: Boolean;
  partStream: TStream;
  responseText: string;

begin
  success := False;

  rest := TRest.Create;
  bTls := True;
  bAutoReconnect := True;
  success := rest.Connect('example.com',443,bTls,bAutoReconnect);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;
  //  The file paths are relative to the application's current working directory.  Absolute paths
  //  may also be used.  Supply the paths appropriate to your own environment.

  //  Select the multipart part to build, and set its header fields.
  rest.PartSelector := '1';
  rest.AddHeader('Content-Disposition','form-data; name="field1"');
  rest.AddHeader('Content-Type','application/octet-stream');

  //  Use a Stream as the body source for the selected part.  The stream's source is a local file,
  //  which is appropriate for large parts.
  partStream := TStream.Create;
  partStream.SourceFile := 'qa_data/attachment.bin';
  success := rest.SetMultipartBodyStream(partStream);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  responseText := rest.FullRequestMultipart('POST','/api/upload');
  if (rest.LastMethodSuccess = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;
  WriteLn(responseText);


  rest.Free;
  partStream.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.