C# WaitForMultipleObjects问题（线程问题）
现在主要是希望启动线程，然后利用像WaitForMultipleObjects这样的函数将线程挂起，当set一个符合的Event事件时触发线程响应。自己做了一个程序，但是在运行时出错，WaitForMultipleObjects返回值总是0xffffffff无效值，不知道为什么，希望有大虾帮助看看，下面是大概示例：

using System.Threading;  
  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);

  const uint iMaxEventNum = 4;

  static 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);

  Thread t1 = new Thread(WaitAndProcEvent);
  t1.IsBackground = true;
  t1.Start();

  SetEvent(m_iEvent[0]);

  bool bOK = false;

  while (!bOK)
  {
  uint uiRet = 0;
  //就是这里，总是得不到正确的值
  uiRet = WaitForMultipleObjects(iMaxEventNum, ref m_iEvent, false, Timeout.Infinite);
  }
}

------解决方案--------------------
GetLastError()
------解决方案--------------------
有可能句柄中某一个被别的线程调用


跟踪一下嘛