MMDRV_OPEN_PARMS

This structure is passed from MDM to the MCD on the MCI_OPEN message. The ulParam2 field of this structure contains the pParam2 passed to MDM by the application.

typedef struct _MMDRV_OPEN_PARMS {
  HWND       hwndCallback;             /*  Window handle for callback. */
  USHORT     usDeviceID;               /*  The device ID assigned to this instance. */
  USHORT     usDeviceType;             /*  Device type number. */
  USHORT     usDeviceOrd;              /*  Device ordinal number. */
  PVOID      pInstance;                /*  Pointer to the instance structure allocated. */
  CHAR       szDevDLLName[260];        /*  Character string. */
  PSZ        pszElementName;           /*  Typically a file name or NULL. */
  USHORT     usDevParmLen;             /*  Device parameters data block length. */
  PVOID      pDevParm;                 /*  Device parameters data block. */
  USHORT     usResourceUnitsRequired;  /*  Number of resource units. */
  USHORT     usResourceClass;          /*  Resource class. */
  USHORT     usResourcePriority;       /*  Resource priority. */
  ULONG      ulParam2;                 /*  Pointer to MCI_OPEN structure. */
} MMDRV_OPEN_PARMS;

typedef   MMDRV _ OPEN _ PARMS   * PMMDRV _ OPEN _ PARMS ;