DRV_QUERYDEVNODE function

The DRV_QUERYDEVNODE message queries for the devnode number assigned to the device by the Plug and Play manager.

Syntax

DWORD  xxxMessage(
   UINT      uDeviceID,
   UINT      uMsg,
   DWORD_PTR dwParam1,
   DWORD_PTR dwParam2
);

uDeviceID
Specifies the ID of the target device.
uMsg
Caller sets this parameter to DRV_QUERYDEVNODE when it calls xxxMessage to process this device message.
dwParam1
Pointer to a caller-allocated DWORD variable into which the function writes the devnode number. If no devnode is assigned to the device, the function sets this variable to zero.
dwParam2
Unused. Set this parameter to zero.

The xxxMessage function returns MMSYSERR_NOERROR if the message is handled successfully. Otherwise, it returns an appropriate error code.

In Windows 2000 and later, the message always returns MMSYSERR_NOTSUPPORTED. This message is valid only for the waveInMessage, waveOutMessage, midiInMessage, midiOutMessage, and mixerMessage functions. The system intercepts this message and returns the appropriate value without sending the message to the device driver. For general information about system-intercepted xxxMessage functions, see System-Intercepted Device Messages.

Target platform	Desktop
Version	Supported in Microsoft Windows Me/98 and not supported Windows 2000 and later operating systems.
Header	Mmddk.h (include Mmddk.h)