windows API 实现精确的打点计时器

利用windows API QueryPerformanceFrequency()和QueryPerformanceCounter()写了一个计算精确时间差的类.

用法：initStart()的时候开始计时，此后每调一次GetTickDelta()返回的是距离上次调用GetTickDelta()所经过的毫秒数。

class MyTick
{
public:
	MyTick() {
		LARGE_INTEGER litmp;
		QueryPerformanceFrequency(&litmp);
		m_cpuClickPerSecond = (double)litmp.QuadPart;
		m_preTick = -1;
	}
	void initStart()
	{
		LARGE_INTEGER litmp;
		QueryPerformanceCounter(&litmp);
		m_preTick = litmp.QuadPart;// 获得初始值
	}
	int GetTickDelta()
	{
		LARGE_INTEGER litmp;
		QueryPerformanceCounter(&litmp);
		LONGLONG curTick = litmp.QuadPart;// 当前tick
		if (m_preTick == -1) {
			return -1;
		} else {
			int res = (int)(1000 * (curTick - m_preTick) / m_cpuClickPerSecond);
			m_preTick = curTick;
			return res;
		}
	}

private:
	double m_cpuClickPerSecond;
	LONGLONG m_preTick;
};

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