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MXDM_CLOSE (Compact 2013)

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3/26/2014

This message requests a user-mode mixer driver to close the specified device instance that was opened with an MXDM_OPEN message.

Syntax

typedef struct {
  DWORD uDeviceId;
  UINT uMsg;
  DWORD dwUser;
  DWORD lParam1;
  DWORD lParam2;
} MXDM_CLOSE;

Members

  • uDeviceId
    Device identifier for the target device. It can be 0, 1, 2, and so on.
  • uMsg
    Equals MXDM_CLOSE.
  • dwUser
    Instance identifier of the instance to close.
  • lParam1
    Not used.
  • lParam2
    Not used.

Return Value

Returns MMSYSERR_NOERROR if the operation is successful. Otherwise, it returns one of the MMSYSERR or MIXERR error codes defined in Mmsystem.h. See mixerClose return values in the Microsoft® Win32® Software Development Kit (SDK).

Remarks

A client sends the MXDM_CLOSE message by calling the user-mode driver's mxmdMessage entry point, passing the specified parameters.

Often, closing a driver instance simply involves removing a client-specific data structure.

Requirements

Header

mmddk.h

See Also

Reference

Audio Mixer Messages
MXDM_OPEN