[wdmaudiodev] Checking if a driver supports a property or not.
- From: Lokesh Patakolusu <lokeshp@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Mon, 1 Jun 2009 07:37:44 -0400
Hi evrybody,
I am using the following code to check if the driver supports property or
not.But it failed
at the createinstance call.Pls let me know if i am doing something wrong
here .Also pls
let me know if there is any other way to check on vista if a driver
supports
property or not.
LPCLASSFACTORY pClassFactory = NULL;
LPKSPROPERTYSET pKsPropertySet = NULL;
HINSTANCE hLibDsound = NULL;
LPFNGETCLASSOBJECT pfnDllGetClassObject = NULL;
typedef HRESULT (STDAPICALLTYPE *LPFNDLLGETCLASSOBJECT)(REFCLSID,
REFIID, LPVOID *);
HRESULT hr = S_OK;
PULONG pultype;
// Load dsound.dll
hLibDsound = LoadLibraryW( L"dsound.dll" );
if( hLibDsound )
{
// Find DllGetClassObject
pfnDllGetClassObject = (LPFNDLLGETCLASSOBJECT)GetProcAddress(
hLibDsound, "DllGetClassObject" );
if( pfnDllGetClassObject )
{
// Create a class factory object
hr = pfnDllGetClassObject( CLSID_DirectSound, IID_IClassFactory,
(LPVOID *)&pClassFactory );
if( SUCCEEDED(hr) )
{
hr = pClassFactory->CreateInstance( NULL, IID_IKsPropertySet, (LPVOID
*)&pKsPropertySet );
//Fails here returning E_NOINTERFACE .
if( pKsPropertySet )
{
hr =
pKsPropertySet->QuerySupport(KSPROPSETID_RtAudio,KSPROPERTY_RTAUDIO_BUFFER,pultype);
}
}
}
}
Thanks and Regards
Lokesh
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