GetQueuedCompletionStatus在什么状况下会返回0。。。。。。。。。

请高手讲详细点啦， 问题点数：20、回复次数：2Top

1 楼click2004（大家好）回复于 2005-01-04 12:34:57 得分 2

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2 楼SmallBigCat（乱花渐欲迷人眼）回复于 2005-01-04 14:10:59 得分 18

If   *lpOverlapped   is   NULL   and   the   function   does   not   dequeue   a   completion   packet   from   the   completion   port,   the   return   value   is   zero.   The   function   does   not   store   information   in   the   variables   pointed   to   by   the   lpNumberOfBytes   and   lpCompletionKey   parameters.   To   get   extended   error   information,   call   GetLastError.   If   the   function   did   not   dequeue   a   completion   packet   because   the   wait   timed   out,   GetLastError   returns   WAIT_TIMEOUT.  
   
  If   *lpOverlapped   is   not   NULL   and   the   function   dequeues   a   completion   packet   for   a   failed   I/O   operation   from   the   completion   port,   the   return   value   is   zero.   The   function   stores   information   in   the   variables   pointed   to   by   lpNumberOfBytes,   lpCompletionKey,   and   lpOverlapped.   To   get   extended   error   information,   call   GetLa   stError.  
   
  If   a   socket   handle   associated   with   a   completion   port   is   closed,   GetQueuedCompletionStatus   returns   ERROR_SUCCESS,   with   lpNumberOfBytes   equal   zero.  
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• null
• getqueuedcompletionstatus
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