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If there is no connection error, the URL loading system continues, and eventually the delegate message connection:didReceiveResponse: is called once the URL loading system has received sufficient load data to construct an NSURLResponse object. This message is where you are notified of error codes such as 404 and 500. You must examine the response error code, determine if there has been an error at the server, and if so, cancel the transfer and notify your user. The connection:didReceiveResponse: message can be called multiple times if the server responds with a series of redirects, or when the content type being returned is a MIME multipart document. Each time the method is called, you should check the status and set to zero the length of the mutable data object that will hold the received data. This is to ensure that MIME multiparts are handled correctly, and that the data object is not holding data from previous requests or redirects. Listing 2-12 shows the

The Add Configuration screen is where you set up your VPN login details, using the information from your help desk or VPN administrator. If your VPN is an L2TP type, then you would use the screen shown here. Scroll to the bottom and enter the Proxy information as required.

One of the main features that Basecamp offers is the ability to view project data in a granular, project-specific, way, as well in a comprehensive dashboard view. As Figure 4-4 shows, Basecamp s dashboard view allows users to view a stream of recent activity across their projects, as well as a global to-do list and milestone calendar. It allows users to quickly see what s going on across all projects.

implementation of the connection:didReceiveResponse: message. Once again, add this to ViewHighScoresAppDelegate.m, immediately after the code in Listing 2-11.

If your VPN is a PPTP type, then you would tap PPTP at the top and use the screen shown here. Scroll to the bottom and enter the Proxy information as required.

Clicking a project name or specific item from the Dashboard tab takes the user to the project view, which has tabs specifically for that project. In Figure 4-5, you can see the project-side Overview screen. This shows primarily shows upcoming milestones and, below that, recent activity. The user can then select Return to Dashboard or switch to a different project (both options are in the top-left of Figure 4-5).

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { NSHTTPURLResponse *HTTPresponse = (NSHTTPURLResponse *)response; NSInteger statusCode = [HTTPresponse statusCode]; if ( 404 == statusCode || 500 == statusCode ) { [rootViewController setTitle: @"Error Getting High Scores"]; [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:FALSE]; [connection cancel]; NSLog(@"Server Error - %@", [ NSHTTPURLResponse localizedStringForStatusCode: statusCode ]); } else { [ responseData setLength:0 ]; } }

If your VPN is an IPSec (Cisco) type, then you would tap IPSec and use the screen shown here. Scroll to the bottom and enter the Proxy information as required.

10. When you are done with your setup, tap the Save button in the upper right corner. 11. If you have trouble logging in, make sure you are in a strong wireless coverage area and verify you have typed all your login credentials correctly. It can be difficult when passwords disappear as you type them. You may want to try re-typing passwords and server information before calling the help desk.

In a similar fashion, the connection:didReceiveData: message will be called at least once, and should be coded with the assumption that it will be called multiple times before the data transfer from the server is finished. The message should simply append the data parameter to the data object in which all the received data is held. Listing 2-13 shows the implementation, which also goes in ViewHighScoresAddDelegate.m. Add this code directly after the connection:didReceiveResponse: message from Listing 2-12.