MCI_WHERE

This MCI command message returns the rectangular region that has been specified (or defaulted) with the MCI_PUT command. The top and left fields of the rectangle contain the origin of the clipping rectangle, and the right and bottom fields contain the width and height of the clipping rectangle.

Parameters DWORD lParam1

The following flags apply to all devices supporting MCI_WHERE:

MCI_NOTIFY	Specifies that MCI should post the MM_MCINOTIFY message when this command completes. The window that receives this message is specified in the dwCallback field of the data structure identified by lParam2.
MCI_TEST	Queries the device to determine if it can execute the command. The device returns an error if it is incapable of executing the command. It returns no error if it can handle the command. MCI returns control to the application without executing the command.
MCI_WAIT	Specifies that the operation should complete before MCI returns control to the application.
DWORD lParam2	Specifies a far pointer to a device-specific data structure. For a description of this parameter, see the lParam2 description included with the device extensions.