NSUrlRequest Not Working Objective C - objective-c

Question

I am trying to use the code below to 'trigger' the web address. The web server doesn't return any data. But the NSURLConnection is being established.
NSString *serverAddressTest = #"http://domain.com";
NSString *fullWebAddress = [NSString stringWithFormat:#"%#?CustomerName=%#&ContactNo=%#&Products=%#",serverAddressTest,customer,contactnumber,allProductsInString];
NSURL *url = [NSURL URLWithString:fullWebAddress];
NSURLRequest *theRequest=[NSURLRequest requestWithURL:url];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection) {
NSMutableData *webData = [NSMutableData data];
NSLog(#"%#",webData);
}
else {
NSMutableData *webData = [NSMutableData data];
NSLog(#"%#",webData);
}

Answer 1

When you write:
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest
delegate:self];
you are starting an asynchronous url connection.
Then immediately after that you are testing whether the connection was successful or not and creating an instance of NSMutableData with local scope. Your NSURLConnectionDelegate methods (which you haven't posted) will not have access to this locally-scoped NSMutableData variable.
Have you indeed implemented the methods of the NSURLConnectionDelegate protocol?

Answer 2

Try to send synchronous request to localise the problem:
NSError *error;
NSData *returnData = [NSURLConnection sendSynchronousRequest: theRequest
returningResponse: nil
error: &error];
NSLog(#"error = %#, \ndata = %#", error, returnData);

Answer 3

You also need to also implement the delegate Protocols. ( As NSBum says)
Using Apples example
shown here is the data is returned when the parts are put together.:
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.apple.com/"]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// Create the NSMutableData to hold the received data.
// receivedData is an instance variable declared elsewhere.
receivedData = [NSMutableData dataWithCapacity: 0];
// create the connection with the request
// and start loading the data
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (!theConnection) {
// Release the receivedData object.
receivedData = nil;
NSLog(#"FAIL " );
// Inform the user that the connection failed.
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(#" response %#", response);
// This method is called when the server has determined that it
// has enough information to create the NSURLResponse object.
// It can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.
// receivedData is an instance variable declared elsewhere.
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the new data to receivedData.
// receivedData is an instance variable declared elsewhere.
[receivedData appendData:data];
NSLog(#" receivedData %#", receivedData);
}
receivedData is not local but declared elsewhere. (NSMutableData* receivedData;)
I do not use this much so cannot expand further without reading the docs fully myself; which is what you need to do. :-)