The MCI_DGV_RESERVE_PARMS structure contains information for the MCI_RESERVE command for digital-video devices.
typedef struct  {
    DWORD dwCallback; 
    LPSTR lpstrPath; 
    DWORD dwSize; 
} MCI_DGV_RESERVE_PARMS;
 When assigning data to the members of this structure, set the corresponding flags in the fdwCommand parameter of the mciSendCommand function to validate the members.
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in digitalv.h.
  Unicode: Defined as Unicode and ANSI structures.
MCI Overview, MCI Structures, MCI_RESERVE, mciSendCommand