In the first line you declare abc
to be an NSMutableArray
In the second line you attempt to access it as an NSDictionary
.
In your case (and I am guessing here), I expect you have an array of items, and each item is a dictionary with an "image" key.
So to get your first item you might use
NSDictionary* firstItem = [abc objectAtIndex:0];
Then you can extract your image from that:
NSString *imgStr=(NSString *)[firstItem valueForKey:@"image"];1
NSString *imgStr = [abc objectForKey:@"image"];
1 see comment from @Stig