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Thread: Qt Application Weird Pause/Halt issue

  1. #1
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    Default Qt Application Weird Pause/Halt issue

    Hi there,

    I have encountered a weird problem recently. I created a new application that process HTML files with Qt. Here is basically what it does

    1. Loads up a HTML page using QWebView
    2. Extract some information from the HTML file
    3. Go back to Step 1 to process the next one.

    The problem is that after a while, the program stops processing. When it stops is totally random. Sometimes it stops after a long while, sometimes it stops half a minute after it starts.

    To resume it, all I need to do is just to hover the mouse cursor over the application window. I don't even need to click anything. Just hovering over it and it will start working again.

    This happens in Windows 7 and Windows Vista. Not sure about XP since I don't have a machine running it.

    I am having a hard time figuring out this problem. Maybe someone can help me with it? Thanks in advance.
    Last edited by roland8454; 8th March 2010 at 18:48.

  2. #2
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    Default Re: Qt Application Weird Pause/Halt issue

    Well, that behavior would cause your message pump to be activated, so maybe it was stuck waiting for something to happen?

    I don't know why your program acts this way, but maybe the addition of a QTimer would give it an appropriate event to stop hanging?
    Last edited by squidge; 8th March 2010 at 23:32.

  3. #3
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    Default Re: Qt Application Weird Pause/Halt issue

    fatjuicymole, thanks for your reply.

    The code does rely on catching "loadFinished" signal from QWebView to make sure an HTML is fully rendered.

    Can you please explain a bit more about the "message pump"? I'm not quite sure what that is. Thank you.

  4. #4
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    Default Re: Qt Application Weird Pause/Halt issue

    Did you figure out why this was happening, and what to do to prevent it? I'm having a similar problem...

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