Pascal (Lazarus/Delphi)

Facebook Upload Photo from Local File

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Uploads a new photo with a caption from a local file. 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;
  responseJson: string;

begin
  success := False;

  //  This example assumes Chilkat HTTP 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 := '/v2.7/me/photos';

  //  Use the previously obtained access token.
  //  Note: The publish_actions scope is required to upload a photo.
  req.AddHeader('Authorization','Bearer FACEBOOK-ACCESS-TOKEN');

  //  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');

  //  Set a photo caption.
  req.AddParam('caption','Here are some penguins!');

  //  Additional parameters can be added to the request by 
  //  calling AddParam once per parameter.  
  //  See https://developers.facebook.com/docs/graph-api/reference/user/photos
  //  for more information about other optional parameters.

  //  Indicate the local file to be uploaded.
  success := req.AddFileForUpload('source','qa_data/jpg/penguins2.jpg');
  if (success = False) then
    begin
      WriteLn(req.LastErrorText);
      Exit;
    end;

  //  Upload the image file..
  resp := THttpResponse.Create;
  success := http.HttpSReq('graph.facebook.com',443,True,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Examine the response body:
  responseJson := resp.BodyStr;
  WriteLn(responseJson);

  //  The response contains JSON, such as this:
  //  {"id":"10210224963435862","post_id":"10224048320139890_10210224963435862"}


  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.