VC get system time

最新推荐文章于 2022-06-18 16:35:39 发布

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本文介绍了三种在Windows环境下测量时间间隔的方法：使用timeGetTime()函数进行毫秒级计时；利用QueryPerformanceCounter与QueryPerformanceFrequency获取更精确的时间间隔；通过KTimer类实现定时功能。这些方法适用于需要精确计时的应用场景。

1、 ms timeGetTime()

#include <windows.h> 
#include <stdio.h> 

main() 
{ 
    DWORD t1, t2; 
    t1 = timeGetTime(); 
    Sleep(1000); 
    t2 = timeGetTime(); 
    printf("Begin Time: %u\n", t1); 
    printf("End Time: %u\n", t2); 
    printf("Lasting Time: %u\n",(t2-t1)); 
}

2、us

QueryPerformanceCount/QueryPerformanceFrequency:

#include <windows.h> 
#include <stdio.h> 
void main() 
{ 
    LARGE_INTEGER t1, t2, tc;
    QueryPerformanceFrequency(&tc);
    printf("Frequency: %u\n", tc.QuadPart);
    QueryPerformanceCounter(&t1); 
    Sleep(1000); 
    QueryPerformanceCounter(&t2); 
    printf("Begin Time: %u\n", t1.QuadPart); 
    printf("End Time: %u\n", t2.QuadPart); 
    printf("Lasting Time: %u\n",( t2.QuadPart- t1.QuadPart)); 
}

3 Ktime

#include <stdio.h> 
#include "KTimer.h" 
main() 
{ 
    unsigned t; 
    KTimer timer; 
    timer.Start(); 
    Sleep(1000); 
    t = timer.Stop(); 
    printf("Lasting Time: %d\n",t); 
}