c++ - Best way to get elapsed time in miliseconds in windows

I'm trying to do it using two FILETIMEs, casting them to ULONGLONGs, substracting the ULONGLONGs, and dividing the result by 10000. But it's pretty slow, and I want to know if there is a better way to do it.I use c++ with visual studio 2008 express edition. This is what I'm using:

FILETIME filetime,filetime2;
GetSystemTimeAsFileTime(&filetime);
Sleep(100);
GetSystemTimeAsFileTime(&filetime2);
ULONGLONG time1,time2;
time1 = (((ULONGLONG) filetime.dwHighDateTime) << 32) + filetime.dwLowDateTime;
time2 = (((ULONGLONG) filetime2.dwHighDateTime) << 32) + filetime2.dwLowDateTime;

printf("ELAPSED TIME IN MS:%d",(int)((time2-time1)/10000));

Answer

Use QueryPerformanceCounter.

long long milliseconds_now() {
    static LARGE_INTEGER s_frequency;
    static BOOL s_use_qpc = QueryPerformanceFrequency(&s_frequency);
    if (s_use_qpc) {
        LARGE_INTEGER now;
        QueryPerformanceCounter(&now);
        return (1000LL * now.QuadPart) / s_frequency.QuadPart;

    } else {
        return GetTickCount();
    }
}

// Somewhere else...
    // ...
    long long start = milliseconds_now();
    // ....
    long long elapsed = milliseconds_now() - start;