c# - c++中是否存在来自C#的更准确的Timers.Timer？ [复制]

This question already has answers here:

Raise event in high resolution interval/timer

(3个答案)


5年前关闭。




我在C#中有一个计时器，每10毫秒执行一次线程:

        private void setTimers(IntPtr paramA, List<int> paramB)
    {
        varTimer= new System.Timers.Timer();
        varTimer.Elapsed += delegate { Check(paramA, paramB); };
        varTimer.Interval = 10;
        varTimer.Start();
    }

和功能:

private void Check(IntPtr paramA, List<int> paramB)
    {
            try
            {
                acquiredLock= false;

                System.Threading.Monitor.TryEnter(syncThreadsC, ref acquiredLock);
                if (acquiredLock)
                {
                    // logic
                }
                else
                {
                    return;
                }
            }
            finally
            {
                if (acquiredLock)
                    System.Threading.Monitor.Exit(syncThreadsC);
            }

    }

我要求它每10毫秒启动一次，甚至知道它不会非常精确，如果我在进入和退出Check时使用StopWatch进行检查，就会得到这些数字:


Check的逻辑仅在1到2毫秒之间。我想知道，因为我相信C#中没有比它更精确的东西了，所以c++中是否有什么东西可以每X ms启动一个更高精度的计时器。如果是这样，我将在一个外部dll中进行调用。这些数字对于我所需要的来说实在是太少了。

谢谢

最佳答案

使用来自Raise event in high resolution interval/timer的更正计时器类，这是高分辨率计时器的示例实现:

class Program
{
    public void Main(string[] args)
    {
        uint timerId = SafeNativeMethods.timeSetEvent( 1, 1, HandleTimerTick, UIntPtr.Zero, 1 );
        Console.ReadLine();
        SafeNativeMethods.timeKillEvent( timerId );
    }

    public static void HandleTimerTick( uint id, uint msg, UIntPtr userCtx, UIntPtr uIntPtr, UIntPtr intPtr )
    {
        Console.WriteLine( "This is a bad idea on short timescales" );
    }
}

public static class SafeNativeMethods
{
    /// <summary>
    /// A timer event handler
    /// </summary>
    /// <param name="id">Timer identifier, as returned by the timeSetEvent function.</param>
    /// <param name="msg">Reserved</param>
    /// <param name="userCtx">The value that was passed in to the userCtx value of the timeSetEvent function.</param>
    /// <param name="dw1">Reserved</param>
    /// <param name="dw2">Reserved</param>
    public delegate void TimerEventHandler( UInt32 id, UInt32 msg, UIntPtr userCtx, UIntPtr dw1, UIntPtr dw2 );
    /// <summary>
    /// A multi media timer with millisecond precision
    /// </summary>
    /// <param name="msDelay">One event every msDelay milliseconds</param>
    /// <param name="msResolution">Timer precision indication (lower value is more precise but resource unfriendly)</param>
    /// <param name="handler">delegate to start</param>
    /// <param name="userCtx">callBack data </param>
    /// <param name="eventType">one event or multiple events</param>
    /// <remarks>Dont forget to call timeKillEvent!</remarks>
    /// <returns>0 on failure or any other value as a timer id to use for timeKillEvent</returns>
    [DllImport( "winmm.dll", SetLastError = true, EntryPoint = "timeSetEvent" )]
    public static extern UInt32 timeSetEvent( UInt32 msDelay, UInt32 msResolution, TimerEventHandler handler, UIntPtr userCtx, UInt32 eventType );

    /// <summary>
    /// The multi media timer stop function
    /// </summary>
    /// <param name="uTimerID">timer id from timeSetEvent</param>
    /// <remarks>This function stops the timer</remarks>
    [DllImport( "winmm.dll", SetLastError = true )]
    public static extern void timeKillEvent( UInt32 uTimerID );
}

完成后，请确保使用timeKillEvent彻底清除计时器，请不要在应用程序中使用大量此类计时器。它们是资源密集型的。

关于c# - c++中是否存在来自C#的更准确的Timers.Timer？ [复制]，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31954828/