WM_MOVE
xPos = (int) LOWORD(lParam); /* horizontal position */
yPos = (int) HIWORD(lParam); /* vertical position */
The WM_MOVE message is sent after a window has been moved.
xPos
Value of the low-order word of lParam. Specifies the new x-coordinate of the upper-left corner of the client area of the window.
yPos
Value of the high-order word of lParam. Specifies the new y-coordinate of the upper-left corner of the client area of the window.
An application should return zero if it processes this message.
The xPos and yPos parameters are given in screen coordinates for overlapped and pop-up windows and in parent-client coordinates for child windows.
An application can use the MAKEPOINT macro to convert the lParam parameter to a POINT data structure.