typedef struct {
DWORD dwCallback;
HWND hWnd;
UINT wReserved1;
UINT nCmdShow;
UINT wReserved2;
LPCSTR lpstrText;
} MCI_OVLY_WINDOW_PARMS;
The MCI_OVLY_WINDOW_PARMS structure contains parameters for the MCI_WINDOW message for video overlay devices. When assigning data to the members in this structure, set the corresponding MCI flags in the lParam1 parameter of mciSendCommand to validate the members.
MCI_WINDOW