MIXEROPENDESC

typedef struct tMIXEROPENDESC

{
   HMIXER          hmx;
   LPVOID          pReserved0;
   DWORD           dwCallback;
   DWORD           dwInstance;
} MIXEROPENDESC;

The MIXEROPENDESC structure contains information needed by user-mode mixer drivers. The structure is created by winmm.dll and passed to the driver with an MXDM_OPEN message.

Members

hmx

Specifies the client’s handle to the device, as assigned by winmm.dll. User-mode drivers specify this handle as the hDriver parameter to DriverCallback, when sending a callback message.

dwCallback

Specifies the address of a callback function. (See the description of the MXDM_OPEN message.)

dwInstance

Contains the dwCallbackInstance argument that the client specified when calling the mixerOpen function. This value is returned to the client as the dwInstance parameter to DriverCallback.