Question

Possible Duplicate:
Ping with iPhone SDK

I am creating a application. Where before sending request to server i need to long server. How can i do that?

Answer 1

You should check the reachability utility that Apple made:

Reachability on developer.apple.com

I think that will do what you want to do.

EDIT

use it like this:

+(BOOL)canConnect {
    Reachability *r = [Reachability reachabilityWithHostName:@"www.example.com"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];
    return ((internetStatus == ReachableViaWiFi) || (internetStatus == ReachableViaWWAN));
}

It will check if you can connect to the internet, and if you can connect to the server with the given adress/ip.