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Asked: 2026-05-11T12:56:01+00:00

I’m curious what some reasons might be as to getting a compiler error for

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I’m curious what some reasons might be as to getting a compiler error for simply importing a header file. If I comment it out, everything compiles just fine — the header/implementation for the class I’m trying to import into one of my UIViewController’s get passed the compiler without any warnings. However, as soon as I include it, I get a multitude of errors.

I’m trying to use Apple’s Reachability app in my own code, and by doing something like:

#import 'Reachability.h'

I get a ton of:

error: syntax error before 'target' error: syntax error before 'SCNetworkReachabilityFlags' error: syntax error before 'SCNetworkReachabilityRef' error: syntax error before 'SCNetworkReachabilityRef' fatal error: method definition not in @implementation context

It’s mostly complaining regarding:

static void ReachabilityCallback(SCNetworkReachabilityRef target,       SCNetworkReachabilityFlags flags, void *info); - (BOOL)isNetworkAvailableFlags:(SCNetworkReachabilityFlags *)outFlags; - (SCNetworkReachabilityRef)reachabilityRefForHostName:(NSString *)hostName; - (CFRunLoopRef)startListeningForReachabilityChanges:(SCNetworkReachabilityRef)reachability onRunLoop:(CFRunLoopRef)runLoop;

Any idea why this is only happening when I try to import the header file?

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1 Answer

  1. It sounds like you probably need to 

    #import <SystemConfiguration/SystemConfiguration.h>
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