Overviews

About Timers

This topic describes how to create, identify, set, and delete timers.

Using Timers

This topic shows how to create and destroy timers, and how to use a timer to trap mouse input at specified intervals.

Functions

KillTimer

The KillTimer function destroys the specified timer.

QueryPerformanceCounter

The QueryPerformanceCounter function retrieves the current value of the high-resolution performance counter.

QueryPerformanceFrequency

The QueryPerformanceFrequency function retrieves the frequency of the high-resolution performance counter, if one exists. The frequency cannot change while the system is running.

SetTimer

The SetTimer function creates a timer with the specified time-out value.

TimerProc

The TimerProc function is an application-defined callback function that processes WM_TIMER messages. The TIMERPROC type defines a pointer to this callback function. TimerProc is a placeholder for the application-defined function name.

Notifications

WM_TIMER

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.