How can I deal with connection problem when I use NSData?

You will have to get the data through a NSURLConnection which will have a timeout value, as described in the URL Loading System Programming Guide This should give you a hint; the guide has more complete sample code: Create an NSURLRequest object with your desired URL and timeout value NSURLRequest *request = NSURLRequest requestWithURL:NSURL URLWithString:@"221.34.21.9" cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0; // Begin a connection using that request // Assign a delegate object that will get callbacks when things happen NSURLConnection *connection = NSURLConnection alloc initWithRequest:request delegate:self Delegate methods are described in the NSURLConnection Class Reference You are probably most interested in connection:didRecieveData and connection:didFailWithError.

You will have to get the data through a NSURLConnection, which will have a timeout value, as described in the URL Loading System Programming Guide. This should give you a hint; the guide has more complete sample code: // Create an NSURLRequest object with your desired URL and timeout value NSURLRequest *request = NSURLRequest requestWithURL:NSURL URLWithString:@"221.34.21.9" cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0; // Begin a connection using that request // Assign a delegate object that will get callbacks when things happen NSURLConnection *connection = NSURLConnection alloc initWithRequest:request delegate:self; Delegate methods are described in the NSURLConnection Class Reference You are probably most interested in connection:didRecieveData and connection:didFailWithError.

Thanks very much. It helps a lot! – Jerry Mar 23 at 9:17.

You need to implement Internet Reacheability, from Apple Reaceability example. It is a test which will allow you to know if your internet connection is reachable.

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