Pascal (Lazarus/Delphi)

Add Data to multipart/form-data Request

See more HTTP Examples

Demonstrates how to add content (such as a JPG, PDF, XML, etc.) to multipart/form-data requests. 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.HttpRequest;

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

procedure RunDemo;
var
  success: Boolean;
  req: THttpRequest;
  bd: TBinData;

begin
  success := False;

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

  req := THttpRequest.Create;
  req.HttpVerb := 'POST';
  req.ContentType := 'multipart/form-data';
  req.Path := '/xyz/something';

  req.AddParam('param1','value1');
  req.AddParam('param2','value2');

  //  Add some small files to the request. (Small so we can see what the full request looks like without too much data..)
  bd := TBinData.Create;
  success := bd.LoadFile('qa_data/jpg/starfish20.jpg');
  req.AddBdForUpload('starfish20','starfish20.jpg',bd,'image/jpeg');

  success := bd.LoadFile('qa_data/pdf/helloWorld.pdf');
  req.AddBdForUpload('helloWorld','helloWorld.pdf',bd,'application/pdf');

  success := bd.LoadFile('qa_data/xml/tinyA.xml');
  req.AddBdForUpload('tinyA','tinyA.xml',bd,'text/xml');

  //  This HTTP request contains binary data, so we cannot call GenerateRequestText
  //  to examine it as a string.  We can instead call GenerateRequestFile
  //  to write the request to a file and then examine using a hex editor,
  //  or an editor that is capable of handling null bytes and non-printable chars (perhaps by displaying "?" chars instead).
  req.GenerateRequestFile('qa_output/multipartFormDataRequest.bin');

  WriteLn('OK.');

  //  This is the HTTP multipart/form-data request built by the above code:

  //  POST /xyz/something HTTP/1.1
  //  Host: domain
  //  Content-Type: multipart/form-data; boundary=------------090708030009010000030901
  //  Content-Length: 2220
  //  
  //  --------------090708030009010000030901
  //  Content-Disposition: form-data; name="param1"
  //  
  //  value1
  //  --------------090708030009010000030901
  //  Content-Disposition: form-data; name="param2"
  //  
  //  value2
  //  --------------090708030009010000030901
  //  Content-Disposition: form-data; name="starfish20"; filename="starfish20.jpg"
  //  Content-Type: image/jpeg
  //  
  //  JPEG DATA HERE...
  //  --------------090708030009010000030901
  //  Content-Disposition: form-data; name="helloWorld"; filename="helloWorld.pdf"
  //  Content-Type: application/pdf
  //  
  //  PDF DATA HERE...
  //  --------------090708030009010000030901
  //  Content-Disposition: form-data; name="tinyA"; filename="tinyA.xml"
  //  Content-Type: text/xml
  //  
  //  XML DATA HERE...
  //  --------------090708030009010000030901--
  //  


  req.Free;
  bd.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.