Windows high-speed timer, multimedia timer Winmm.dll Library usage

The items used in the project are not allowed to be tested on the high-name timers. See the source code discovery is also used System.Timers.Timer or with the thread sleep way to achieve. 100 milliseconds is not allowed. Until a search, found that the use of multimedia timer Winmm.dll Millisecondtimer is available. The original is from the blog (dehai) Timer timing inaccurate questions and solutions. The code is as follows:

 Public sealed class Millisecondtimer:icomponent, IDisposable {//********************************************        Field ******************************************************************* private static timercaps caps;        private int interval;        private bool isrunning;        private int resolution;        Private TimerCallback TimerCallback;        private int Timerid; Property *****************************************************            <summary>/////</summary> public int Interval {            get {return this.interval; } set {if (Value < caps.periodmin) | |                (Value > Caps.periodmax)) {throw new Exception ("Beyond the timing range!                ");            } this.interval = value; }}///<summary&Gt </summary> public bool IsRunning {get {return T            his.isrunning;            }}///<summary>/////</summary> public ISite Site {            Set        Get }//***************************************************** Event ***************************************************  public event EventHandler disposed;        This event implements the Icomponet interface public event EventHandler Tick; ************************************************* of constructors and release functions        Static Millisecondtimer () {timegetdevcaps (ref caps, marshal.sizeof (caps));    } public Millisecondtimer () {this.interval = Caps.periodmin;  This.resolution = Caps.periodmin;            This.isrunning = false; This.timeRcallback = new TimerCallback (this.        Timereventcallback); Public Millisecondtimer (IContainer container): this () {container.        ADD (this);        } ~millisecondtimer () {timekillevent (This.timerid); }//***************************************************** Method ***************************************************            <summary>//////</summary> public void Start () { if (!isrunning) {Timerid = timeSetEvent (This.interval, This.resolution, This.timercall Back, 0, 1);                Run if (Timerid = = 0) {throw new Exception ("Unable to start timer") at intervals;            } isrunning = true;            }}///<summary>////</summary> public void Stop () { if (isrunning) {TimekilleveNT (This.timerid);            IsRunning = false;        }}///<summary>//Implement IDisposable interface///</summary> public void Dispose ()            {timekillevent (This.timerid); Gc.            SuppressFinalize (this); Disposed?.        Invoke (this, eventargs.empty); }//*************************************************** intrinsic function **************************************************** [DllImport ("Winmm.dll")] private static extern int timesetevent (int delay, int resolution, Ti        Mercallback callback, int user, int mode);        [DllImport ("Winmm.dll")] private static extern int timekillevent (int id);         [DllImport ("Winmm.dll")] private static extern int timegetdevcaps (ref timercaps caps, int sizeoftimercaps); private void timereventcallback (int id, int msg, int user, int param1, int param2) {Tick?.  Invoke (this, null); Raise Event}//********Internal Type **************************************************************** * * Private delegate void TimerCallback (int id, int msg, int user, int param1, int param2); timeSetEvent the signature of the callback function for the///<summary>///timer resolution (resolution).        Unit is MS, Ms? </summary> [StructLayout (layoutkind.sequential)] private struct Timercaps {publ            IC int periodmin;        public int Periodmax; }    }}

Test code

 Class Program {static dictionary<string, int> dtlist = new dictionary<string, int> ();            static void Main (string[] args) {//var timer = new Doublethreadtimer (100, 100); Timer.            Onrunningcallback + = Timer1_Tick; Timer.            Start ();            var timer1 = new Millisecondtimer (); Timer1.            Interval = 2; Timer1.            Tick + = Timer1_Tick; Timer1.            Start ();        Console.ReadLine ();            } private static void Timer1_Tick (object sender, EventArgs e) {var dt = DateTime.Now; String dtstr = dt.            ToString ("YyyyMMdd hhmmss");                if (Dtlist.containskey (DTSTR)) {dtlist[dtstr]++; If (dtlist[dtstr]% = = 0) {Console.WriteLine (dtstr + "--->"                    + dtlist[dtstr]);                Dtlist.remove (DTSTR);       }} else {         if (Dtlist.count > 1) {foreach (var item in dtlist) { Console.WriteLine (item. Key + "--->" + item.                     Value);                } dtlist.clear ();                            } dtlist.add (Dtstr, 1); }        }    }

　　

Test conclusion: The time interval is set to 5 milliseconds, and the performance is stable. 2 milliseconds is sometimes accurate. Reliability is a lot faster than. NET timer.

Windows high-speed timer, multimedia timer Winmm.dll Library usage