Querying a Single Feature Dynamically Using CFeatureDiscovery

How to query a feature using CFeatureDiscovery dynamically.

1. 
   Determine the Uid of the feature.
2. Create an instance of CFeatureDiscovery thus,

   
     // Dynamic way of using the class using NewL():
     
     // Call NewL() to create an instance of CFeatureDiscovery. 
     CFeatureDiscovery* testA = CFeatureDiscovery::NewL();
   

   or thus

   
     // Dynamic way of using the class using NewLC():
   
     // Call NewLC() to create an instance of CFeatureDiscovery.
     // The method leaves the instance of the object on the cleanup stack.
     CFeatureDiscovery* testB = CFeatureDiscovery::NewLC();
   

3. call its IsSupported() function with the Uid of the feature as argument, and

     // Call the exported IsSupported() method to query whether features 
     // are supported in the current environment or not.
     TBool usbSupported = testA->IsSupported(<featureUIDx>);
     TBool mmcSupported = testA->IsSupported(<featureUIDx>);
   

4. 
   delete the instance of CFeatureDiscovery if it was not created using NewLC().

     // Delete the created instance of CFeatureDiscovery.
     delete testA;