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POHow to retrieve a response from server for the request sent?
 

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  1. POHow to retrieve a response from server for the request sent?
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    <p>I am developing an application that connects to a remote web server and exchanges data with the web server frequently. First screen of my application provides login screen that authenticates user. </p> <p>I am able to authenticate user on the web server by sending a request to the server but unable to get response from the server to display success alert to the user on the iphone. In clear, I am not getting any response.</p> <p>The server I'm using is developed in Java. </p> <p>I am using the following to send the request to server.</p> <pre><code>NSString *post = @"username="; post = [post stringByAppendingString:username]; post = [post stringByAppendingString:@"&amp;password="]; post = [post stringByAppendingString:password]; NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES]; NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]]; NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:[NSURL URLWithString:@"http://example.com/login.action?"]]; [request setHTTPMethod:@"POST"]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; [request setHTTPBody:postData]; NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:request delegate:self]; </code></pre> <p>And, </p> <pre><code>- (void)connectionNSURLConnection *)connection didReceiveDataNSData *)data { [receivedData appendData:data]; NSString *ReturnStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"In \"didReceiveData()\" : receivedData = %@",receivedData); NSLog(@"Return String : %@", ReturnStr); } </code></pre> <p>This function is never called.</p> <p>What should I do to receive response for the request I have sent?</p> <p>A brief collection of my queries:</p> <p>Example: Login screen that validates a user in Java server</p> <ol> <li>I am sending request that I am able to see at the console of my server application.</li> <li>I'm unable to get response for the request.</li> <li>In which format the response data must be sent?</li> </ol> <p>Would someone provide a clear picture of data exchange between the iPhone application and a Java servlet?</p> <h2>Update</h2> <p>I have implemented these three methods also. But no response from server. Can you guide me the process of developing LOGIN application that communicates with a JAVA server by requests and responses? I am stuck with communicating.</p> <p>Yeah, my server is receiving request from iphone. I am able to see the request that is sent to the server. </p> <p>I am not able to understand how the data exchange between iphone application and JAVA server takes place. I'm a newbie to this iphone development.</p>
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