Network Programming in .NET

I got this rather cryptic error when trying to include the Criticism SDK in an IOS app:

Undefined symbols for architecture arm64:

“_SCNetworkReachabilityGetFlags”, referenced from:

-[CRReachability connectionRequired] in libCrittercism_v5_2_0.a(CRReachability.o)

-[CRReachability currentReachabilityStatus] in libCrittercism_v5_2_0.a(CRReachability.o)

“_SCNetworkReachabilityScheduleWithRunLoop”, referenced from:

-[CRReachability startNotifier] in libCrittercism_v5_2_0.a(CRReachability.o)

“_SCNetworkReachabilityUnscheduleFromRunLoop”, referenced from:

-[CRReachability stopNotifier] in libCrittercism_v5_2_0.a(CRReachability.o)

“_SCNetworkReachabilitySetCallback”, referenced from:

-[CRReachability startNotifier] in libCrittercism_v5_2_0.a(CRReachability.o)

“_SCNetworkReachabilityCreateWithAddress”, referenced from:

+[CRReachability reachabilityWithAddress:withKey:] in libCrittercism_v5_2_0.a(CRReachability.o)

“_SCNetworkReachabilityCreateWithName”, referenced from:

+[CRReachability reachabilityForHostName:withNotificationKey:] in libCrittercism_v5_2_0.a(CRReachability.o)

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

The solution was to include the SystemConfiguration framework in the project.

– Simple, if the error message wasn’t so bloody cryptic!