change code to avoid bug in qt5.3

core/settingsservice.h

@@ -41,7 +41,8 @@ public:
         for (int i = 0; i < objSettings->metaObject()->propertyCount(); i++)
         {
             const char *propName = objSettings->metaObject()->property(i).name();             
-            QVariant varVal = val.toObject()[propName].toVariant();
+            QJsonValue v = val.toObject()[propName];
+            QVariant varVal = v.toVariant();
             objSettings->setProperty(propName, varVal);
         }