Dart Requires Chilkat v11.0.0+

Facebook Upload Photo from Local File

See more Facebook Examples

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

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes Chilkat HTTP to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final http = CkHttp();

  final req = CkHttpRequest();
  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.
  try {
    req.addFileForUpload('source', 'qa_data/jpg/penguins2.jpg');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Upload the image file..
  final resp = CkHttpResponse();
  try {
    http.httpSReq('graph.facebook.com', 443, true, req, resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Examine the response body:
  final responseJson = resp.bodyStr;
  print(responseJson);

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