wxPostEvent and wxRichTextCtrl problem
in [wxWindows]
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From: hapalibashi on 29 Oct 2009 07:34 I have incoming asynchronous events that are posted using wxPostEvent (this, myEvent). In onMyEvent I am writing to a wxRichTextCtrl. Occasionally the data written to wxRichTextCtrl is *interleaved* e.g. onMyEvent writes "hello how are you?" to the wxRichTextCtrl onMyEvent writes "yeah I'm ok" to the wxRichTextCtrl wxRichTextCtrl shows "hello how yeah I'm ok are you?" This suggested that the onMyEvent is called multiple times in parallel. However, it is my understanding that there is *one* message queue and that messages are processed *one at a time* so this should not happen! Does this mean there is an issue internal to wxRichTextCtrl and it cannot be used like this?
From: Vadim Zeitlin on 30 Oct 2009 21:23 On 2009-10-29, hapalibashi(a)googlemail.com <hapalibashi(a)googlemail.com> wrote: > I have incoming asynchronous events that are posted using wxPostEvent > (this, myEvent). In onMyEvent I am writing to a wxRichTextCtrl. > > Occasionally the data written to wxRichTextCtrl is *interleaved* e.g. > > onMyEvent writes "hello how are you?" to the wxRichTextCtrl > onMyEvent writes "yeah I'm ok" to the wxRichTextCtrl > > wxRichTextCtrl shows "hello how yeah I'm ok are you?" > > This suggested that the onMyEvent is called multiple times in > parallel. However, it is my understanding that there is *one* message > queue and that messages are processed *one at a time* so this should > not happen! Yes, it really shouldn't. The only explanation I can see is that adding the text to wxRichTextCtrl somehow results in reentering the event loop and so dispatching another pending event. This would be the case if the notorious wxYield() function were used in it but I hope this isn't the case... Regards, VZ -- TT-Solutions: wxWidgets consultancy and technical support http://www.tt-solutions.com/
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