title: Exporting a photo to Instagram
body: <p>I am trying to export a photo from my application to Instagram, using this code:</p>
  
  <pre><code>// Capture Screenshot
  UIGraphicsBeginImageContextWithOptions(self.view.frame.size,self.view.opaque,0.0);
  [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  NSData *imageData = UIImageJPEGRepresentation(image, 1.0);
  NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/test.igo"];
  NSURL *igImageHookFile = [[NSURL alloc] initWithString:[[NSString alloc] initWithFormat:@"file://%@", jpgPath]];
  dic = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:igImageHookFile]];
  dic.UTI = @"com.instagram.photo";
  dic.annotation = [NSDictionary dictionaryWithObject:@"my caption" forKey:@"InstagramCaption"];
  NSURL *instagramURL = [NSURL URLWithString:@"instagram://app"];
  if ([[UIApplication sharedApplication] canOpenURL:instagramURL]) {
    [[UIApplication sharedApplication] openURL:instagramURL];
  } else {
    NSLog(@"No Instagram Found");
  }
  </code></pre>
  
  <p>But it is not working. It crashes with the following error:</p>
  
  <blockquote>
    <p>2013-01-19 20:40:41.948 Ayat[12648:c07] <strong>* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*</strong> -[NSURL initFileURLWithPath:]: nil string parameter'</p>
  </blockquote>
  
  <p>I am not sure I'm properly:</p>
  
  <p>1- Saving jpgpath as the screenshot I took .</p>
  
  <p>2- Passing the "dic" document to Instagram.</p>