MXDM_GETLINECONTROLS

The MXDM_GETLINECONTROLS message requests a user-mode mixer driver to return information about specified controls connected to a specified audio line, for the specified device.

Parameters

uDeviceId

Device identifier (0, 1, 2, and so on) for the target device.

uMsg

MXDM_GETLINECONTROLS

dwUser

Instance identifier associated with the caller.

lParam1

Pointer to a MIXERLINECONTROLS structure, which is described in the Win32 SDK.

lParam2

Contains flag values. For a list of valid flags, see the description of mixerGetLineControls in the Win32 SDK.

Return Value

The driver should return MMSYSERR_NOERROR if the operation succeeds. Otherwise it should return one of the MMSYSERR or MIXERR error codes defined in mmsystem.h. See mixerGetLineControls return values in the Win32 SDK.

Comments

A client sends the MXDM_GETLINECONTROLS message by calling the user-mode driver’s mxdMessage entry point, passing the specified parameters.

The driver receives an empty MIXERLINECONTROLS structure and fills it in.