DCIENUMINPUT structure
typedef struct {
DCICMD
dcicmd;
// DCI Command header
RECT
rSrc;
// source rectangle
RECT
rDest;
// destination rectangle
CALLBACK
*EnumCallback;
// Provider calls to return support
LPVOID
lpContext;
// Provider must pass back to Client
} DCIENUMINPUT, FAR * LPDCIENUMINPUT;