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copied!<p>(1) Try using</p> <pre><code>NSLog(@"%@", imgurl); </code></pre> <p>The 1st argument of NSLog is always interpreted as a format string, even if it's a variable (the runtime doesn't care). If <code>imgurl</code> contains format specifiers (e.g. <code>%2c</code>) then something undefined may happen.</p> <hr> <p>(2) </p> <pre><code> galleryArray = [[NSMutableArray alloc] init]; galleryArray = [resultDictionary valueForKey:@"gallery"]; imgurl = (NSString *)[galleryArray objectAtIndex:0]; NSLog(@" -> %@", galleryArray); NSLog(imgurl); </code></pre> <p>There are 2 problems here. The 2nd line will override the empty mutable array initialized in the 1st line, thus causing a memory leak. The <code>galleryArray</code> assigned in the 2nd line will likely be released after the function ends, thus creating a dangling pointer. The same goes for <code>imgurl</code>. This probably is the main cause of the crash. I recommend you read the <a href="http://developer.apple.com/mac/library/documentation/cocoa/conceptual/MemoryMgmt/Articles/mmRules.html" rel="nofollow noreferrer">Cocoa Memory Management Rules</a> again. Anyway, this piece of code should be like:</p> <pre><code> self.galleryArray = [resultDictionary valueForKey:@"gallery"]; self.imgurl = [galleryArray objectAtIndex:0]; NSLog(@" -> %@", galleryArray); NSLog(@"%@", imgurl); </code></pre> <p>or</p> <pre><code> [galleryArray release]; galleryArray = [[resultDictionary valueForKey:@"gallery"] retain]; [imgurl release]; imgurl = [[galleryArray objectAtIndex:0] retain]; // or -copy. NSLog(@" -> %@", galleryArray); NSLog(@"%@", imgurl); </code></pre>

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