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並前往https://microsoft.public.vc.mfc.narkive.com/bR66xbwu/problem-with-readfile-using-overlapped-i-o-in-vc

problem with ReadFile using Overlapped I/O in VC++ - narkive

I suppose you call SetCommTimeouts, though you ommitted it in your code. Zero bytes read doesn't mean error. It's successful ReadFile call with zero

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查詢 「SetCommTimeouts」的人也找了：

  1. GetCommTimeouts
    2.
  2. SetCommState
    3.
  3. ReadFile timeout
    4.
  4. ClearCommError
    5.
  5. PurgeComm
    6.
  6. GetCommState
    7.
  7. lpOverlapped
    8.
  8. SetCommMask
    9.