C++获取时间间隔（毫秒）

LARGE_INTEGER m_i64CPUFreq;
LARGE_INTEGER m_i64Begin;
LARGE_INTEGER m_i64End;


QueryPerformanceFrequency(&m_i64CPUFreq);
QueryPerformanceCounter(&m_i64Begin);
    //do something..............
QueryPerformanceCounter(&m_i64End);

// 获取毫秒
double ms = m_i64End.QuadPart - m_i64Begin.QuadPart) / (double)m_i64CPUFreq.QuadPart * 1000;