Send a Staged REST Request with a Streamed Body

See more REST Examples

Demonstrates Rest.SendReqStreamBody, which sends a request whose body is read from a Stream, then reads the response in separate steps.

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;
  bodyStream: TStream;
  statusCode: Integer;
  responseBody: 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.

  //  The request body is read from a Stream whose source is a local file.
  bodyStream := TStream.Create;
  bodyStream.SourceFile := 'qa_data/upload.json';

  rest.AddHeader('Content-Type','application/json');

  //  Send the request, reading the body from the stream.  The 3rd argument is the Stream.
  success := rest.SendReqStreamBody('POST','/api/upload',bodyStream);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  After sending, read the response status line and header fields.  The return value is the HTTP
  //  status code, or -1 if no response was received.
  statusCode := rest.ReadResponseHeader();
  if (statusCode < 0) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;
  WriteLn('Response status code: ' + statusCode);

  //  Read the response body as text.
  responseBody := rest.ReadRespBodyString();
  if (rest.LastMethodSuccess = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;
  WriteLn(responseBody);


  rest.Free;
  bodyStream.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.