pCursorPos (PRECTL)
If usCode = QCP_CONVERT, pCursorPos should be updated to contain the position of the cursor in the window receiving this message. The position is specified as a rectangle in screen coordinates.
If usCode = QCP_NOCONVERT, pCursorPos should not be updated.
ulReserved (ULONG)
usCode (USHORT)
QCP_CONVERT