Question

I got from server a response :

 [NSURLConnection
     sendAsynchronousRequest:request
     queue:[[NSOperationQueue alloc] init]
     completionHandler:^(NSURLResponse *response,
                         NSData *data,
                         NSError *error)
     {

         if ([data length] >0 && error == nil)
         {
             NSLog(@"DATA1: %@",data);
             NSString *content;
             content = [NSString stringWithUTF8String:[data bytes]];
             NSLog(@"DATA2: %@",content);

something is strange here. the second NSLOG shows me a null data- but if the data is null how could he pass the if statement ?
the first log show me: <636f6e66 69726d65 64> .

I have to say that sometimes it do work ! it depend on the values somehow …

Answer 1

Because the with first log, you’re printing the NSData instance, and with the second, the NSString you want to generate from the data. But if the data is not valid UTF-8 (which may be the case, since it’s not NUL-terminated, and stringWithUTF8String: requires a NUL-terminated string, so it doesn’t stop at the end and it might read garbage), then it returns nil.

What you want is:

content = [[[NSString alloc] initWithBytes:data.bytes length:data.length encoding:NSUTF8StringEncoding] autorelease];