Question

I have been trying to post a photo on facebook using facebook graph API. After authenticating user I am doing as following

        NSMutableDictionary *variables = [[NSMutableDictionary alloc]init];
        [variables setObject:@"some text" forKey:@"message"];
        [variables setObject:@"some link" forKey:@"link"];
        [variables setObject:[UIImage imageNamed:@"[e-mail]"] forKey:@"picture"];

        NSString *str = @"me/feed";
        NSLog(@"str: %@", str);
        FbGraphResponse *resp = [self.fbGraph doGraphPost:str withPostVars:variables];
        NSLog(@"resp: %@", resp.htmlResponse);

But my app crashes by throwing an exception:

    *** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: -[UIImage dataUsingEncoding:]: unrecognized selector sent to instance 0x11545140'

So some one can help me how do i post an image on Facebook wall along with some message using graph API.

Answer 1

Use the given below code

NSMutableDictionary *variables = [NSMutableDictionary dictionaryWithCapacity:3];

//create a UIImage (you could use the picture album or camera too)
//UIImage *picture =selectimage.image;
UIImage *picture =[self scaleAndRotateImage:selectimage.image];

FbGraphFile *graph_file = [[FbGraphFile alloc] initWithImage:picture];

    [variables setObject:graph_file forKey:@"file"];

    [variables setObject:myPost.text forKey:@"message"];

    FbGraphResponse *fb_graph_response = [fbGraph doGraphPost:@"me/photos" withPostVars:variables];