The WM_TIMER message is posted to the installing thread's message queue when a timer expires. The message is posted by the GetMessage or PeekMessage function.
Syntax
WM_TIMER
WPARAM wParam
LPARAM lParam;
Parameters
- wParam
-
[in] Specifies the timer identifier.
- lParam
-
[in] Pointer to an application-defined callback function that was passed to the SetTimer function when the timer was installed.
Return Value
An application should return zero if it processes this message.
Remarks
You can process the message by providing a WM_TIMER case in the window procedure. Otherwise, DispatchMessage will call the TimerProc callback function specified in the call to the SetTimer function used to install the timer.
The WM_TIMER message is a low-priority message. The GetMessage and PeekMessage functions post this message only when no other higher-priority messages are in the thread's message queue.
Notification Requirements
| Minimum DLL Version |
None |
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| Header | Declared in Winuser.h, include Windows.h |
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| Minimum operating systems |
Windows 95, Windows NT 3.1 |
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See Also