DRV_QUERYMAPPABLE

Returns whether or not the specified device will be used by a mapper.

The system intercepts this message and returns the appropriate value without sending the message to the device driver. Most drivers will not use this message.

• Returns MMSYSERR_NOERROR if the device is mappable; otherwise, returns an error value.

dwParam1

Set to zero.

dwParam2

Set to zero.