Question

when iPhone connects to a wireless router, and that router is not connected to the internet? i need to display an error message saying “check you internet connection” i tried the Reachability sample code. but no luck,
http://developer.apple.com/library/ios/#samplecode/Reachability/Listings/ReadMe_txt.html

when i disable the WIFI in phone it’s working fine, i tried the Checking For Internet Connectivity in Objective C sample code “isDataSourceAvailable” even itz not working,can any one help me to fix this issue, really appriciate.

Answer 1

You could do something like this:

+ (BOOL) pingServer
{
    NSURL *url = [NSURL URLWithString:@"http://some-url-that-has-to-work/"];
    NSURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    NSHTTPURLResponse *response = nil;
    [NSURLConnection sendSynchronousRequest:request
        returningResponse:&response error:NULL];
    return (response != nil);
}

This is a synchronous request, so that it will block the current thread. You can do the whole network check in a background thread, so that blocking it won’t matter, or you can send the request asynchronously. Also you might want to set the HTTP method to HEAD, so that you won’t download the whole resource.