The MCI_GETDEVCAPS_PARMS structure contains device-capability information for the MCI_GETDEVCAPS command.
typedef struct {
    DWORD dwCallback; 
    DWORD dwReturn; 
    DWORD dwItem; 
} MCI_GETDEVCAPS_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 mmsystem.h.
MCI Overview, MCI Structures, MCI_GETDEVCAPS, mciSendCommand