How to take a screenshot in my application and publish it on facebook?

Question

I am trying to use facebook in my application by posting a screenshot of my application on my wall.

I already made functions for taking a screenshot

UIGraphicsBeginImageContext(self.view.bounds.size); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil); 

and to publish materials on my facebook wall with an icon, title and a small description.

 - (void)postToWall { FBStreamDialog* dialog = [[[FBStreamDialog alloc] init] autorelease]; dialog.userMessagePrompt = @"Enter your message:"; dialog.attachment = [NSString stringWithFormat:@"{\"name\":\"%@ share a photo\",\"href\":\"mywebsite.com/\",\"caption\":\"%@thinks this is a nice photo\",\"description\":\"\",\"media\":[{\"type\":\"image\",\"src\":\"mywebsite.com/icon.png\",\"href\":\"mywebsite.com/\"}]}", _facebookName, _facebookName]; dialog.actionLinks = @"[{\"text\":\"Get My App\",\"href\":\"http://itunes.apple.com//\"}]"; } 

Any suggestions on how to put my screenshot in the postToWall method? Thanks in advance!

Answer 1

Using the Facebook SDK for iPhone is possible. You will need to build a block and an argument block (NSDictionary) and send it to your trusted Facebook session.

In this snippet, a “session” is of the Facebook * type defined in the Facebook.h SDK.

 NSMutableDictionary *args = [[[NSMutableDictionary alloc] init] autorelease]; [args setObject:captionText forKey:@"caption"]; [args setObject:messageText forKey:@"message"]; [args setObject:UIImageJPEGRepresentation(yourImage, 0.7) forKey:@"picture"]; [session requestWithMethodName:@"photos.upload" andParams:args ndHttpMethod:@"POST" andDelegate:self]; 

Answer 2

It looks like you cannot do this completely through Facebook. To do this, you should look at sites for sharing photos. First upload your image to this site and get a link. Then share it using this method.

Edit
I am not saying that downloading photos is not possible. It is simply impossible to send a photo to the wall with a link to your application without first loading it.