(Delphi DLL) Facebook Upload Photo from Local File

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

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
req: HCkHttpRequest;
success: Boolean;
resp: HCkHttpResponse;
responseJson: PWideChar;

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

http := CkHttp_Create();

req := CkHttpRequest_Create();
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'multipart/form-data');
CkHttpRequest_putPath(req,'/v2.7/me/photos');

// Use the previously obtained access token.
// Note: The publish_actions scope is required to upload a photo.
CkHttpRequest_AddHeader(req,'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.
CkHttpRequest_AddHeader(req,'Expect','100-continue');

// Set a photo caption.
CkHttpRequest_AddParam(req,'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 := CkHttpRequest_AddFileForUpload(req,'source','qa_data/jpg/penguins2.jpg');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkHttpRequest__lastErrorText(req));
    Exit;
  end;

// Upload the image file..
resp := CkHttp_SynchronousRequest(http,'graph.facebook.com',443,True,req);
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

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

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

CkHttpResponse_Dispose(resp);

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);

end;