QNativeWifiEngine: Fix problem with wifi polling on Windows

On some Windows machines the wifi detection in
QNativeWifiEngine::available does not work as WlanOpenHandle still
succeed altough there is no WLAN card. So instead we can detect this
using the WlanEnumInterfaces in requestUpdate() instead.

Task-number: QTBUG-17219
Reviewed-by: Xizhi Zhu

1 files changed, 5 insertions, 0 deletions

diff --git a/src/plugins/bearer/nativewifi/qnativewifiengine.cpp b/src/plugins/bearer/nativewifi/qnativewifiengine.cpp
index 16c2239..d5beeff 100644
--- a/src/plugins/bearer/nativewifi/qnativewifiengine.cpp
+++ b/src/plugins/bearer/nativewifi/qnativewifiengine.cpp
@@ -501,6 +501,11 @@ void QNativeWifiEngine::requestUpdate()
         return;
     }
 
+    if (interfaceList->dwNumberOfItems == 0) {
+        local_WlanFreeMemory(interfaceList);
+        return;
+    }
+
     bool requested = false;
     for (unsigned int i = 0; i < interfaceList->dwNumberOfItems; ++i) {
         result = local_WlanScan(handle, &interfaceList->InterfaceInfo[i].InterfaceGuid, 0, 0, 0);