DRV_QUERYDEVNODE function

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

Parameters

• 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.

Return value

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

Remarks

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.

Requirements

See also

midiInMessage

midiOutMessage

mixerMessage

System-Intercepted Device Messages

waveInMessage

waveOutMessage