Pascal (Lazarus/Delphi)

HTTP multipart/form-data Upload

See more HTTP Examples

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST. 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.Http,
  Chilkat.HttpRequest,
  Chilkat.HttpResponse;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  req: THttpRequest;
  resp: THttpResponse;

begin
  success := False;

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

  http := THttp.Create;

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

  //  Send an "Expect: 100-continue" header in the request.
  //  This causes the HTTP server to end a 100-continue response
  //  immediately after receiving the HTTP header.  The client
  //  (Chilkat) will receive this intermediate response, and if
  //  it's not an error response, it knows that the HTTP server will
  //  accept the data that is forthcoming.
  //  The alternative is to get an error response after trying to upload
  //  the entire contents of the files.
  req.AddHeader('Expect','100-continue');

  //  Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
  //  To allow Chilkat to determine the content-type automatically based on file-extension,
  //  call AddFileForUpload instead.

  //  The 1st arg is the filename passed in the HTTP request.
  //  The 2nd arg is the path in the local filesytem.
  //  The file is not loaded into memory.  It is streamed directly from the file
  //  when the HTTP POST is sent.
  success := req.AddFileForUpload2('starfish.jpg','c:/qa_data/starfish.jpg','image/jpg');
  if (success = False) then
    begin
      WriteLn(req.LastErrorText);
      Exit;
    end;

  success := req.AddFileForUpload('something.pdf','c:/qa_data/something.pdf');
  if (success = False) then
    begin
      WriteLn(req.LastErrorText);
      Exit;
    end;

  //  Its also possible to add a file from a string:
  success := req.AddStringForUpload('test.xml','test.xml','<abc>This is the test.xml content</abc>','utf-8');
  //  We'll assume success since no files are involved..

  //  This sends the HTTP request (with 3 files being uploaded) to
  //  http://www.mywebserver123abc.com/rcvFormDataUpload.aspx
  resp := THttpResponse.Create;
  success := http.HttpSReq('www.mywebserver123abc.com',80,False,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('HTTP response status: ' + resp.StatusCode);
  //  See the online reference documentation for 
  //  other information that can be obtained from the response object.

  //  To send using SSL/TLS, do this instead.
  //  This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
  success := http.HttpSReq('www.mywebserver123abc.com',443,True,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('HTTP response status: ' + resp.StatusCode);
  //  See the online reference documentation for 
  //  other information that can be obtained from the response object.


  http.Free;
  req.Free;
  resp.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.