WM_WINDOWPOSCHANGED message

Sent to a window whose size, position, or place in the Z order has changed as a result of a call to the SetWindowPos function or another window-management function.

A window receives this message through its WindowProc function.

#define WM_WINDOWPOSCHANGED             0x0047

Parameters

wParam

This parameter is not used.

lParam

A pointer to a WINDOWPOS structure that contains information about the window's new size and position.

Return value

Type: LRESULT

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

Remarks

By default, the DefWindowProc function sends the WM_SIZE and WM_MOVE messages to the window. The WM_SIZE and WM_MOVE messages are not sent if an application handles the WM_WINDOWPOSCHANGED message without calling DefWindowProc. It is more efficient to perform any move or size change processing during the WM_WINDOWPOSCHANGED message without calling DefWindowProc.

Requirements

Minimum supported client
Windows 2000 Professional [desktop apps only]
Minimum supported server
Windows 2000 Server [desktop apps only]
Header
Winuser.h (include Windows.h)

See also

Reference

DefWindowProc

EndDeferWindowPos

SetWindowPos

WINDOWPOS

WM_MOVE

WM_SIZE

WM_WINDOWPOSCHANGING

Conceptual

Windows