如何在WinXP下获得准确的1ms计时器滴答

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

int main()
{
    LARGE_INTEGER frequency;
    LARGE_INTEGER start;
    LARGE_INTEGER end;

    QueryPerformanceFrequency(&frequency);
    QueryPerformanceCounter(&start);

    // 您的代码

    QueryPerformanceCounter(&end);
    double elapsedTime = (double)(end.QuadPart - start.QuadPart) / frequency.QuadPart * 1000;

    printf("Elapsed time: %f ms\n", elapsedTime);
    return 0;
}

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

int main()
{
    UINT wTimerRes = 1;
    MMRESULT result = timeBeginPeriod(wTimerRes);

    DWORD start = timeGetTime();

    // 您的代码

    DWORD end = timeGetTime();
    timeEndPeriod(wTimerRes);

    double elapsedTime = (double)(end - start);

    printf("Elapsed time: %f ms\n", elapsedTime);
    return 0;
}