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POHow to check for local Wi-Fi (not just cellular connection) using iPhone SDK?
 

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  1. POHow to check for local Wi-Fi (not just cellular connection) using iPhone SDK?
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    <p>I'm currently using the following to check whether <a href="http://en.wikipedia.org/wiki/Wi-Fi" rel="noreferrer">Wi-Fi</a> is available for my application:</p> <pre><code>#import &lt;SystemConfiguration/SystemConfiguration.h&gt; static inline BOOL addressReachable(const struct sockaddr_in *hostAddress); BOOL localWiFiAvailable() { struct sockaddr_in localWifiAddress; bzero(&amp;localWifiAddress, sizeof(localWifiAddress)); localWifiAddress.sin_len = sizeof(localWifiAddress); localWifiAddress.sin_family = AF_INET; // IN_LINKLOCALNETNUM is defined in &lt;netinet/in.h&gt; as 169.254.0.0 localWifiAddress.sin_addr.s_addr = htonl(IN_LINKLOCALNETNUM); return addressReachable(&amp;localWifiAddress); } static inline BOOL addressReachable(const struct sockaddr_in *hostAddress) { const SCNetworkReachabilityRef target = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr *)hostAddress); if (target != NULL) { SCNetworkReachabilityFlags flags = 0; const BOOL reachable = SCNetworkReachabilityGetFlags(target, &amp;flags); CFRelease(target); return reachable &amp;&amp; (flags &amp; kSCNetworkFlagsReachable); } return NO; } </code></pre> <p>This, however, does not return NO as it should when the iPhone is connected only to a cellular network but not a Wi-Fi network. Does anyone know how to fix this?</p> <h2>Edit</h2> <p>So this is what I ended up using:</p> <pre><code>#import &lt;arpa/inet.h&gt; // For AF_INET, etc. #import &lt;ifaddrs.h&gt; // For getifaddrs() #import &lt;net/if.h&gt; // For IFF_LOOPBACK BOOL localWiFiAvailable() { struct ifaddrs *addresses; struct ifaddrs *cursor; BOOL wiFiAvailable = NO; if (getifaddrs(&amp;addresses) != 0) return NO; cursor = addresses; while (cursor != NULL) { if (cursor -&gt; ifa_addr -&gt; sa_family == AF_INET &amp;&amp; !(cursor -&gt; ifa_flags &amp; IFF_LOOPBACK)) // Ignore the loopback address { // Check for WiFi adapter if (strcmp(cursor -&gt; ifa_name, "en0") == 0) { wiFiAvailable = YES; break; } } cursor = cursor -&gt; ifa_next; } freeifaddrs(addresses); return wiFiAvailable; } </code></pre> <p>Thanks "unforgiven" (and Matt Brown apparently).</p>
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    1. COUnfortunately, this doesn't work, at least not for determining if Wi-Fi is activated. You can have Wi-Fi on, and this routine will still return false if the Wi-Fi adapter is not connected to a network. Thanks, though.
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