System.Timers.Timer 每秒最多只能提供 64 帧 [英] System.Timers.Timer only gives maximum 64 frames per second

问题描述

我有一个应用程序，它使用 System.Timers.Timer 对象来引发由主表单处理的事件 (Windows 窗体、C#).我的问题是，无论我将 .Interval 设置多短(甚至设置为 1 毫秒)，我每秒最多可以获得 64 次.

I have an application that uses a System.Timers.Timer object to raise events that are processed by the main form (Windows Forms, C#). My problem is that no matter how short I set the .Interval (even to 1 ms) I get a max of 64 times per second.

我知道 Forms 计时器有 55 毫秒的准确度限制，但这是 System.Timer 变体，而不是 Forms 变体.

I know the Forms timer has a 55 ms accuracy limit, but this is the System.Timer variant, not the Forms one.

该应用程序占用 1% 的 CPU，因此它绝对不受 CPU 限制.所以它所做的就是:

The application sits a 1% CPU, so it's definitely not CPU-bound. So all it's doing is:

• 将计时器设置为 1&nsp;ms
• 当事件触发时，增加一个 _Count 变量
• 再次将其设置为 1&nsp;ms 并重复

_Count 每秒最多递增 64 次，即使没有其他工作要做.

_Count gets incremented a maximum of 64 times a second even when there's no other work to do.

这是一个回放"应用程序，它必须复制进来的数据包，它们之间只有 1-2 毫秒的延迟，所以我需要一些可以每秒可靠地触发 1000 次左右的东西(尽管我会解决如果我受 CPU 限制，则为 100，我不是).

This is an "playback" application that has to replicate packets coming in with as little as 1-2 ms delay between them, so I need something that can reliably fire 1000 times a second or so (though I'd settle for 100 if I was CPU bound, I'm not).

有什么想法吗?

推荐答案

尝试 多媒体计时器 - 它们为硬件平台提供尽可能高的准确性.这些计时器以比其他计时器服务更高的分辨率安排事件.

Try Multimedia Timers - they provide greatest accuracy possible for the hardware platform. These timers schedule events at a higher resolution than other timer services.

您将需要以下 Win API 函数来设置计时器分辨率、启动和停止计时器:

You will need following Win API functions to set timer resolution, start and stop timer:

[DllImport("winmm.dll")]
private static extern int timeGetDevCaps(ref TimerCaps caps, int sizeOfTimerCaps);

[DllImport("winmm.dll")]
private static extern int timeSetEvent(int delay, int resolution, TimeProc proc, int user, int mode);

[DllImport("winmm.dll")]
private static extern int timeKillEvent(int id);

您还需要回调委托:

delegate void TimeProc(int id, int msg, int user, int param1, int param2);

和定时器功能结构

[StructLayout(LayoutKind.Sequential)]
public struct TimerCaps
{
    public int periodMin;
    public int periodMax;
}

用法:

TimerCaps caps = new TimerCaps();
// provides min and max period 
timeGetDevCaps(ref caps, Marshal.SizeOf(caps));
int period = 1;
int resolution = 1;
int mode = 0; // 0 for periodic, 1 for single event
timeSetEvent(period, resolution, new TimeProc(TimerCallback), 0, mode);

和回调:

void TimerCallback(int id, int msg, int user, int param1, int param2)
{
    // occurs every 1 ms
}

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