Read the REST Response Body into BinData

See more REST Examples

Demonstrates Rest.ReadRespBd, which reads the response body as raw bytes into a BinData, replacing its previous contents.

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.StringBuilder,
  Chilkat.Rest,
  Chilkat.BinData;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  bAutoReconnect: Boolean;
  statusCode: Integer;
  sbError: TStringBuilder;
  bdResponse: TBinData;
  bSaved: Boolean;

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.

  success := rest.SendReqNoBody('GET','/api/images/1');
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  statusCode := rest.ReadResponseHeader();
  if (statusCode < 0) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Check for the expected success status code.  If the response is not 200, the body is likely
  //  error text formatted as JSON, XML, or HTML rather than the expected binary content.  In that case
  //  read the body as text, report it, and return.
  if (statusCode <> 200) then
    begin
      sbError := TStringBuilder.Create;
      success := rest.ReadRespSb(sbError);
      if (success = False) then
        begin
          WriteLn(rest.LastErrorText);
          Exit;
        end;
      WriteLn('Request failed with status code ' + statusCode);
      WriteLn(sbError.GetAsString());
      Exit;
    end;

  //  The status code is 200.  Read the response body as raw bytes into a BinData.
  bdResponse := TBinData.Create;
  success := rest.ReadRespBd(bdResponse);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  bSaved := bdResponse.WriteFile('qa_output/image.png');
  if (bSaved <> True) then
    begin
      WriteLn('Failed to save the response body.');
      Exit;
    end;
  WriteLn('Received ' + bdResponse.NumBytes + ' bytes.');


  rest.Free;
      sbError.Free;
  bdResponse.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.