C++计算前后两帧之间的时间

m++;
if (m%2==1)
{
    points1[0] = points[1];
    e1 = getTickCount();
}
else
{
    points1[1] = points[1];
    e2 = getTickCount();
    Time = (e2 - e1) / getTickFrequency();
    cout << "time="<<Time << endl;
}