Delphi ActiveX

Facebook Upload Photo from Local File

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Uploads a new photo with a caption from a local file. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
http: TChilkatHttp;
req: TChilkatHttpRequest;
resp: TChilkatHttpResponse;
responseJson: WideString;

begin
success := 0;

// This example assumes Chilkat HTTP to have been previously unlocked.
// See Global Unlock Sample for sample code.

http := TChilkatHttp.Create(Self);

req := TChilkatHttpRequest.Create(Self);
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 = 0) then
  begin
    Memo1.Lines.Add(req.LastErrorText);
    Exit;
  end;

// Upload the image file..
resp := TChilkatHttpResponse.Create(Self);
success := http.HttpSReq('graph.facebook.com',443,1,req.ControlInterface,resp.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// Examine the response body:
responseJson := resp.BodyStr;
Memo1.Lines.Add(responseJson);

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