Dart

Paging User Photos with Cursor

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Demonstrates how to iterate over the pages of user photos using a cursor. Dart

import 'package:chilkat/chilkat.dart';

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

  // This example assumes a previously obtained an access token
  final oauth2 = CkOAuth2();
  oauth2.accessToken = 'FACEBOOK-ACCESS-TOKEN';

  final rest = CkRest();

  // Connect to Facebook.
  try {
    rest.connect('graph.facebook.com', 443, true, true);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Provide the authentication credentials (i.e. the access key)
  rest.setAuthOAuth2(oauth2);

  // Indicate that we only want the photos the user has personally uploaded.
  rest.addQueryParam('type', 'uploaded');

  // We could limit the number of photos per page using the "limit" field.
  rest.addQueryParam('limit', '20');

  // Get the 1st page of photos. (Not the actual image data, but the information about each photo.)
  // See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
  String responseJson;
  try {
    responseJson = rest.fullRequestNoBody('GET', '/v2.7/me/photos');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final json = CkJsonObject();
  json.emitCompact = false;
  json.load(responseJson);
  print(json.emit());

  // See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.
  // 

  // Get the "after" cursor.
  var afterCursor = json.stringOf('paging.cursors.after');
  while (json.lastMethodSuccess) {

    print('after cursor: $afterCursor');

    // Prepare for getting the next page of photos.
    // We can continue using the same REST object.
    // If already connected, we'll continue using the existing connection.
    // Otherwise, a new connection will automatically be made if needed.
    rest.clearAllQueryParams();
    rest.addQueryParam('type', 'uploaded');
    rest.addQueryParam('limit', '20');
    rest.addQueryParam('after', afterCursor);

    try {
      responseJson = rest.fullRequestNoBody('GET', '/v2.7/me/photos');
    } on ChilkatException catch (e) {
      print(e.lastErrorText);
      return;
    }

    json.load(responseJson);
    // See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.

    print(json.emit());

    // Get the cursor for the next page.
    afterCursor = json.stringOf('paging.cursors.after');
  }

  print('No more pages of photos.');
}