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  1. Qt
  2. QTBUG-62083

Windows: WM_USER to a different HWND in the message queue does not turn on the socket notifiers again

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P3: Somewhat important P3: Somewhat important
    • 5.9.2
    • 5.9.1
    • Core: Event loop
    • None
    • msvc2015
    • 7c2850cd8f1029b74d960fad5754320b61176f46 (qtbase/5.9/31.7.2017, 5.9.2)

      problem: sporadically there are no more "readyRead" signals from QTcpSocket, even though there is data sent to the socket

      I manage to track it to the proccessing of WM_QT_ACTIVATENOTIFIERS in qeventdispatcher_win.cpp (see Attachment):
      the socket notifiers do not get registered again because a WM_USER message to a different HWND is found by PeekMessage at qtbase\src\corelib\kernel\qeventdispatcher_win.cpp:210 .

      cause: the 2nd param of PeekMessage is "0" (=look for any window of the current thread)
      and on the other hand WM_QT_SOCKETNOTIFIER = WM_USER(1024) is a widely-used customized window message   

      proposal to fix: the 2nd param to PeekMessage should be "d->internalHwnd" instead of "0", souldn't it?

       

        1. WM_QT_ACTIVATENOTIFIERS.png
          WM_QT_ACTIVATENOTIFIERS.png
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            kleint Friedemann Kleint
            reiteran Anton Reiter
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