C# waitformultipleobjects()

class WatchThread
    {
        [DllImport("kernel32.dll")]
        private static extern int CreateEvent(IntPtr lpEventAttributes,
            bool bManualReset,
            bool bInitialState,
            string lpName);

        [DllImport("kernel32.dll")]
        private static extern bool SetEvent(int iEvent);

        [DllImport("kernel32.dll")]
        private static extern uint WaitForMultipleObjects(uint nCount,
            ref int lpHandles,
            bool bWaitAll,
            int dwMilliseconds);

        public void Test()
        {
            const uint iMaxEventNum = 4;

            int[] m_iEvent = new int[4];
           IntPtr pt = new IntPtr();
           
           m_iEvent[0] = CreateEvent(pt, false, false, null);
           m_iEvent[1] = CreateEvent(pt, false, false, null);
           m_iEvent[2] = CreateEvent(pt, false, false, null);
           m_iEvent[3] = CreateEvent(pt, false, false, null);   
           SetEvent(m_iEvent[2]);
           bool bOK = false;
           while (!bOK)
           {
              uint uiRet = 0xffff;
              uiRet = WaitForMultipleObjects(iMaxEventNum, ref m_iEvent[0], false, Timeout.Infinite);
               //uiRet 返回事件的index
           }
        }
    }