Double star argument in objective-c method?

Question

NSURLResponse *response =[[NSURLResponse alloc] initWithURL:requestingURL
                                                   MIMEType:@"text/xml"
                                      expectedContentLength:-1
                                           textEncodingName:nil];

webData = [NSURLConnection sendSynchronousRequest:theRequest
                                returningResponse:response
                                            error:NULL];

I get the compiler warning saying warning pass argument from incompatible pointer type. I suspect this is because the NSURLResponse argument is a double star argument, (NSURLResponse **)?

What am I doing wrong here?

Answer 1

The response is being returned to you by reference.

NSURLResponse *response = nil;
NSError *error = nil;
NSData *data = [NSURLConnection sendSynchronousRequest: request
                                returningResponse: &response
                                error: &error];

This is the correct way to call it, and get back the response and error by reference.

In the code above, in addition to the syntax error, you're leaking the response object.