Question

I’m a novice in iOS developing, and have some problems with understanding web service organization. I want to send a Get query to the URL. And I do it so:

-(BOOL) sendLoginRequest{
NSString *getAction = [NSString stringWithFormat:@"action=%@&username=%password=%@",@"login",self.log.text, self.pass.text];
NSString *getUserName = [NSString stringWithFormat:@"username=%@",self.log.text];
NSString *getPassword = [NSString stringWithFormat:@"username=%@",self.pass.text];

NSData *getDataAction = [getAction dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

NSString *getLengthAction = [NSString stringWithFormat:@"%d", [getDataAction length]];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];

[request setURL:[NSURL URLWithString:@"http:http://www.site.fi/api/"]];

[request setHTTPMethod:@"GET"];

[request setValue:getLengthAction forHTTPHeaderField:@"Content-Length"];

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

[request setHTTPBody:getLengthAction];

self.urlConnection = [[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];

NSAssert(self.urlConnection != nil, @"Failure to create URL connection.");

// show in the status bar that network activity is starting
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

the answer may be “true” or “false”

but how can I take this answer?

Answer 1

You should define next methods to get answer:

1. Start connection: [self.urlConnection start];

2. Check server response:

   - (void)connection:(NSURLConnection *)theConnection didReceiveResponse:(NSURLResponse *)response

3. Collect data that servers sends you:

   - (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)data

4. Be sure to manage errors:

   - (void)connection:(NSURLConnection *)theConnection didFailWithError:(NSError *)error

5. Check received data:

   - (void)connectionDidFinishLoading:(NSURLConnection *)theConnection

To be more sure that you correctly understood me check NSURLConnection Class Reference