HRESULT
STDMETHODCALLTYPE
CClassFactory::CreateInstance(
_In_opt_ IUnknown * /* OuterObject */,
_In_ REFIID InterfaceId,
_Out_ PVOID *Object
)
/*++
Routine Description:
This COM method is the factory routine - it creates instances of the driver
callback class and returns the specified interface on them.
Arguments:
OuterObject - only used for aggregation, which our driver callback class
does not support.
InterfaceId - the interface ID the caller would like to get from our
new object.
Object - a location to store the referenced interface pointer to the new
object.
Return Value:
Status.
--*/
{
HRESULT hr;
PCMyDriver driver;
*Object = NULL;
hr = CMyDriver::CreateInstance(&driver);
if (SUCCEEDED(hr))
{
hr = driver->QueryInterface(InterfaceId, Object);
driver->Release();
}
return hr;
}
HRESULT
CMyDriver::CreateInstance(
_Out_ PCMyDriver *Driver
)
/*++
Routine Description:
This static method is invoked in order to create and initialize a new
instance of the driver class. The caller should arrange for the object
to be released when it is no longer in use.
Arguments:
Driver - a location to store a referenced pointer to the new instance
Return Value:
S_OK if successful, or error otherwise.
--*/
{
PCMyDriver driver;
HRESULT hr;
//
// Allocate the callback object.
//
driver = new CMyDriver();
if (NULL == driver)
{
return E_OUTOFMEMORY;
}
//
// Initialize the callback object.
//
hr = driver->Initialize();
if (SUCCEEDED(hr))
{
//
// Store a pointer to the new, initialized object in the output
// parameter.
//
*Driver = driver;
}
else
{
//
// Release the reference on the driver object to get it to delete
// itself.
//
driver->Release();
}
return hr;
}