WM_MOVE message

Sent after a window has been moved.

A window receives this message through its WindowProc function.

#define WM_MOVE                         0x0003

wParam

This parameter is not used.

lParam

The x and y coordinates of the upper-left corner of the client area of the window. The low-order word contains the x-coordinate while the high-order word contains the y coordinate.

Type: LRESULT

If an application processes this message, it should return zero.

The parameters are given in screen coordinates for overlapped and pop-up windows and in parent-client coordinates for child windows.

The following example demonstrates how to obtain the position from the lParam parameter.

xPos = (int)(short) LOWORD(lParam);   // horizontal position 
yPos = (int)(short) HIWORD(lParam);   // vertical position 

You can also use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.

The DefWindowProc function sends the WM_SIZE and WM_MOVE messages when it processes the WM_WINDOWPOSCHANGED message. The WM_SIZE and WM_MOVE messages are not sent if an application handles the WM_WINDOWPOSCHANGED message without calling DefWindowProc.

Reference

HIWORD

LOWORD

WM_WINDOWPOSCHANGED

Conceptual

Windows

Other Resources

MAKEPOINTS

POINTS