一、高精度定时器的使用

1.添加引用，选择dll 文件

讯享网

dll文件路径：

高精度定时器\MultimediaTimer\HighPrecisionTimer\bin\Debug\HighPrecisionTimer.dll

2.使用命名空间：

using HighPrecisionTimer;

3.使用定时器

讯享网 class Program { static readonly HPTimer timer = new HPTimer();//创建高精度定时器对象 static DateTime lastTime; static void Main() { // 每秒执行一次 timer.Interval = 1;//设置定时器的时间间隔 timer.Ticked += Timer_Ticked;//timer的Ticked事件注册一个方法Timer_Ticked() lastTime = DateTime.Now; timer.Start();//高精度定时器开启 Console.ReadKey(); timer.Stop();//高精度定时器关闭 } private static void Timer_Ticked()//Timer_Ticked方法 { DateTime dateTime = DateTime.Now; TimeSpan tp = dateTime - lastTime; lastTime = dateTime; Console.WriteLine(tp.TotalMilliseconds); } }

二、高精度定时器的实现

1.创建一个项目，起名为HighPrecisionTimer；

2.在HighPrecisionTimer添加一个库文件EnumDefine.cs，该库文件的代码如下：

namespace HighPrecisionTimer { public enum TimerError { /// <summary>没有错误</summary> MMSYSERR_NOERROR = 0, /// <summary>常规错误码</summary> MMSYSERR_ERROR = 1, /// <summary>ptc 为空，或 cbtc 无效，或其他错误</summary> TIMERR_NOCANDO = 97, /// <summary>无效参数</summary> MMSYSERR_INVALPARAM = 11, } public enum EventType01 { /// <summary>单次执行</summary> TIME_ONESHOT = 0x0000, /// <summary>循环执行</summary> TIME_PERIODIC = 0x0001, } public enum EventType02 { /// <summary>定时器到期时，调用回调方法。这是默认值</summary> TIME_CALLBACK_FUNCTION = 0x0000, /// <summary>定时器到期时，调用 setEvent</summary> TIME_CALLBACK_EVENT_SET = 0x0010, /// <summary>定时器到期时，调用 PulseEvent</summary> TIME_CALLBACK_EVENT_PULSE = 0x0020, /// <summary>防止在调用 timeKillEvent 函数之后发生事件</summary> TIME_KILL_SYNCHRONOUS = 0x0100, } }

3.在HighPrecisionTimer添加一个库文件HPTimer.cs，该库文件的代码如下：

讯享网using System; using System.Runtime.InteropServices; namespace HighPrecisionTimer { /// <summary> /// 定时器分辨率：毫秒 /// </summary> struct TimerCaps { /// <summary>最小周期</summary> public int periodMin; /// <summary>最大周期</summary> public int periodMax; } /// <summary> /// 高精度定时器 /// </summary> public class HPTimer { static HPTimer() { TimeGetDevCaps(ref _caps, Marshal.SizeOf(_caps)); } public HPTimer() { Running = false; _interval = _caps.periodMin; _resolution = _caps.periodMin; _callback = new TimerCallback(TimerEventCallback); } ~HPTimer() { TimeKillEvent(_id); } /// <summary> /// 系统定时器回调 /// </summary> /// <param name="id">定时器编号</param> /// <param name="msg">预留，不使用</param> /// <param name="user">用户实例数据</param> /// <param name="param1">预留，不使用</param> /// <param name="param2">预留，不使用</param> private delegate void TimerCallback(int id, int msg, int user, int param1, int param2); #region 动态库接口 /// <summary> /// 查询设备支持的定时器分辨率 /// </summary> /// <param name="ptc">定时器分辨率结构体指针</param> /// <param name="cbtc">定时器分辨率结构体大小</param> /// <returns></returns> [DllImport("winmm.dll", EntryPoint = "timeGetDevCaps")] private static extern TimerError TimeGetDevCaps(ref TimerCaps ptc, int cbtc); /// <summary> /// 绑定定时器事件 /// </summary> /// <param name="delay">延时：毫秒</param> /// <param name="resolution">分辨率</param> /// <param name="callback">回调接口</param> /// <param name="user">用户提供的回调数据</param> /// <param name="eventType"></param> [DllImport("winmm.dll", EntryPoint = "timeSetEvent")] private static extern int TimeSetEvent(int delay, int resolution, TimerCallback callback, int user, int eventType); /// <summary> /// 终止定时器 /// </summary> /// <param name="id">定时器编号</param> [DllImport("winmm.dll", EntryPoint = "timeKillEvent")] private static extern TimerError TimeKillEvent(int id); #endregion #region 属性 /// <summary>时间间隔：毫秒</summary> public int Interval { get { return _interval; } set { if (value < _caps.periodMin || value > _caps.periodMax) throw new Exception("无效的计时间隔"); _interval = value; } } public bool Running { get; private set; } #endregion #region 事件 public event Action Ticked; #endregion #region 公开方法 public void Start() { if (!Running) { _id = TimeSetEvent(_interval, _resolution, _callback, 0, (int)EventType01.TIME_PERIODIC | (int)EventType02.TIME_KILL_SYNCHRONOUS); if (_id == 0) throw new Exception("启动定时器失败"); Running = true; } } public void Stop() { if (Running) { TimeKillEvent(_id); Running = false; } } #endregion #region 内部方法 private void TimerEventCallback(int id, int msg, int user, int param1, int param2) { Ticked?.Invoke(); } #endregion #region 字段 // 系统定时器分辨率 private static TimerCaps _caps; // 定时器间隔 private int _interval; // 定时器分辨率 private int _resolution; // 定时器回调 private TimerCallback _callback; // 定时器编号 private int _id; #endregion } }

3.编译生成该项目，在bin目录下得到一个HighPrecisionTimer.dll文件。