To find out if users provided incorrect credentials you can do this:

NSURLResponse* response;
NSError* error;
NSData* result = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&response error:&error];

NSSting *resultString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(@”%@”,resultString);

[resultString release];

“resultString” is the response to the request. all you have to do now is to parse it.

Thanks for the code example. Very useful.
Can you explain how one can find out if the user provided incorrect credentials? At the moment the code logs “Posted successfully to Twitter” even if the password is incorrect.

Many thanks,
Joe

[NSURLConnection connectionWithRequest: request delegate: some_class]

Where some_class is an instance of a class that implements delegate functions (e.g. connectionDidFinishLoading:conection, connection:DidReceiveData, etc). Any processing will be done in the current thread, but it likely pales in comparison to the latency of the http request.