macos - check internet connection in cocoa application

Question

How do I check internet connection in an OS X cocoa application? Can Apple's iOS Reachability example code be reused for this purpose?

Thanks,

Nava

Answer 1

The current version of Reachability code (2.2) listed on Apple's site and referenced above does NOT compile as-is for a Mac OS X Cocoa application. The constant kSCNetworkReachabilityFlagsIsWWAN is only available when compiling for TARGET_OS_IPHONE and Reachability.m references that constant. You will need to #ifdef the two locations in Reachability.m that reference it like below:

#if TARGET_OS_IPHONE
      (flags & kSCNetworkReachabilityFlagsIsWWAN)               ? 'W' : '-',
#else
      0,
#endif

and

#if TARGET_OS_IPHONE
if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
{
    // ... but WWAN connections are OK if the calling application
    //     is using the CFNetwork (CFSocketStream?) APIs.
    retVal = ReachableViaWWAN;
}
#endif