Question

I have a problem now. I need to pass an transactionID and an user password to a rest service and it is suppose to return me a true/false value (in XML format). However, it is consistently returning me (null).. I am totally lost some one please help.

    NSString *urlString = [NSString stringWithFormat:@"https://10.124.128.93:8443/axis2/services/C3WebService/completeWithdrawal  Transaction?transactionId=%@&password=%@", _transactionID.text, _userPassword.text];

    NSURL *url = [[NSURL alloc] initWithString:urlString];
    NSString *result = [[NSString alloc] initWithContentsOfURL:url];


    NSLog(@"%@",result );

My result is constantly returning me null. How do i continue from here?

Answer 1

Consider using NSURLConnection which has a callback for the result and also a callback to get detailed error details. It als doesn’t execute on the UI thread (doesn’t hang UI during the request).

 NSURL *url = [NSURL URLWithString:@"http://www.mysite.com"];

 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

 [request setHTTPMethod:@"GET"];
 [[NSURLConnection alloc] initWithRequest:request delegate:self];

Then you can implement the delegate methods to get the error, the data and other details:

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [responseData appendData:data];
}

- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
    [connection release];

    NSString* responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    NSLog(@"result: %@", responseString);

    [responseString release];
}

- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
      NSLog(@"error - read error object for details");
}