QueryPerformanceCounter queryperformancefrequency usage of C # precision timekeeping

C # Usage:

     Public Static classQUERYPERFORMANCEMETHD {[DllImport ("Kernel32.dll")]       Public  extern Static  ShortQueryPerformanceCounter (ref Longx); [DllImport ("Kernel32.dll")]         Public extern Static  ShortQueryPerformanceFrequency (ref Longx); }

    Staticvoid Main (String[] args) {Long Stop_value =0;Long Start_value =0;Long freq =0; Queryperformancemethd.queryperformancefrequency (ref freq); Queryperformancemethd.queryperformancecounter (ref start_value); //Fun() requires a timing method Queryperformancemethd.queryperformancecounter (ref stop_value); Double time = (double) (stop_value-start_value)/(double) (Freq); Console.WriteLine (time); // unit S console.readline ();}              

The calculated time is consumed by the fun () method.

Usage of QueryPerformanceCounter QueryPerformanceFrequency in C + +

#include"stdafx.h"#include"windows.h"voidMain () {Large_integer nfreq;    Large_integer Nbegintime;    Large_integer Nendtime; DoubleTime ; QueryPerformanceFrequency (&nfreq); QueryPerformanceCounter (&nbegintime); Sleep ( +); QueryPerformanceCounter (&nendtime); time= (Double) (Nendtime.quadpart-nbegintime.quadpart)/(Double) Nfreq.quadpart; printf ("%f\n", time); System ("Pause");}

Calculates the exact time consumed by sleep (1000), not the exact 1s

QueryPerformanceCounter queryperformancefrequency usage of C # precision timekeeping