WM_ACTIVATE message

Sent to both the window being activated and the window being deactivated. If the windows use the same input queue, the message is sent synchronously, first to the window procedure of the top-level window being deactivated, then to the window procedure of the top-level window being activated. If the windows use different input queues, the message is sent asynchronously, so the window is activated immediately.


#define WM_ACTIVATE                     0x0006

Parameters

wParam

The low-order word specifies whether the window is being activated or deactivated. This parameter can be one of the following values. The high-order word specifies the minimized state of the window being activated or deactivated. A nonzero value indicates the window is minimized.

ValueMeaning
WA_ACTIVE
1

Activated by some method other than a mouse click (for example, by a call to the SetActiveWindow function or by use of the keyboard interface to select the window).

WA_CLICKACTIVE
2

Activated by a mouse click.

WA_INACTIVE
0

Deactivated.

 

lParam

A handle to the window being activated or deactivated, depending on the value of the wParam parameter. If the low-order word of wParam is WA_INACTIVE, lParam is the handle to the window being activated. If the low-order word of wParam is WA_ACTIVE or WA_CLICKACTIVE, lParam is the handle to the window being deactivated. This handle can be NULL.

Return value

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

Remarks

If the window is being activated and is not minimized, the DefWindowProc function sets the keyboard focus to the window. If the window is activated by a mouse click, it also receives a WM_MOUSEACTIVATE message.

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
SetActiveWindow
WM_MOUSEACTIVATE
WM_NCACTIVATE
Conceptual
Keyboard Input

 

 

Community Additions

ADD
Show:
© 2014 Microsoft