一個簡單的計時器類

#include <Windows.h>

namespace MS_TIMER
{
	// dwNowTime和dwPreTime的值都由GetTickCount獲取
	DWORD  GetTimeInterval(DWORD dwNowTime, DWORD dwPreTime)
	{
		if (dwNowTime >= dwPreTime)
		{
			return dwNowTime - dwPreTime;
		}
		else
		{
			return 0xFFFFFFFF - dwPreTime + dwNowTime;
		}
	}


	class CMSTimer
	{
	private:
		DWORD       m_dwNowTime;
		DWORD       m_dwPreTime;
		DWORD       m_dwTimeOutValue;

	public:
		CMSTimer()
		{
			m_dwPreTime = 0;
			m_dwNowTime = 0;
		}

		~CMSTimer()
		{

		}

		/// 單位毫秒，外部調用如果是秒需要乘以1000
		void Start(DWORD  dwTimeOutValue)
		{
			m_dwTimeOutValue = dwTimeOutValue;
			m_dwPreTime = GetTickCount();
		}

		bool IsTimeOut()
		{
			m_dwNowTime = GetTickCount();
			if (GetTimeInterval(m_dwNowTime, m_dwPreTime) > m_dwTimeOutValue)
				return true;
			else
				return false;
		}
	};

}