C++中的Tickcount和毫秒

Question

如何从TickCounts转换为毫秒？

这是我用过的:

long int before = GetTickCount();
long int after = GetTickCount();

我希望它在几秒钟内有所不同.

Answer 1

int seconds = (after - before) /1000;

Answer 2

为了更精确,还有 QueryPerformanceCounter()