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  1. #1
    Registered User
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    Jul 2009
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    17

    app does not launch when on QT 4.7 but works fine on QT 4.6.2

    Hi,

    I developed an application on qt for Symbian on QT 4.6.2. It works perfectly fine on this version, but when i install the latest version of QT 4.7, this app does not start. When i start the app, it showz black screen for a second and then closes it.

    Please suggest what can be the reason.

    Thanks in advanve

  2. #2
    Nokia Developer Moderator
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    Mar 2003
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    Lempäälä/Finland
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    29,175

    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    maybe the device does not have the correct Qt in it, so try checking that you have installed Qt 4.7 into the device, and try again.

  3. #3
    Nokia Developer Champion
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    Dec 2008
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    2,357

    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    even I have same prob, so I do back to Qt 4.6

  4. #4
    Super Contributor
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    India
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    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    This is working fine for me as yucca suggested check whether qt4.7 is installed properly or not.
    Use [URL="http://qt.nokia.com/products/qt-quick/"]Qt-Quick[/URL] to make your application UI more attractive.

    [URL="http://store.ovi.com/content/271896"]http://store.ovi.com/content/271896[/URL] | [URL="http://store.ovi.com/content/276199"]http://store.ovi.com/content/276199[/URL] |[URL="http://store.ovi.com/content/276202"] http://store.ovi.com/content/276202[/URL] | [URL="http://store.ovi.com/content/280827"]http://store.ovi.com/content/280827[/URL]

  5. #5
    Nokia Developer Moderator
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    Mar 2003
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    Lempäälä/Finland
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    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    You could also try installing the 4.7 libraries into your testing device, that way you could take advance of the new features of 4.7. of course if you do not need the 4.7 new parts, then you could of course continue with 4.6 for a short while longer.

  6. #6
    Registered User
    Join Date
    Nov 2005
    Posts
    5

    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    Hi,

    We've had a similar problem. We had a fully-tested, stable app that was built and run using QT 4.6.3. We needed a QT bug fix in 4.71. After compiling with 4.7.1 and then running on a device with 4.7.1, the app would crash. Our debug logging showed this happening when accessing a boost shared_ptr and it made no sense. We couldn't find anything wrong with what we were doing.

    We are speculating some sort of bug and/or incompatibility with QT 4.7.1 and the OpenC/OpenC++ v1.7.5 libraries.

    We haven’t had the time to get any further in the analysis. In the mean time, we have rolled back to building with QT 4.6.3 but running on a device with 4.7.1. This is working fine, including the QT bug fixes in 4.7.1 that were blocking us from releasing our app.

    Regards

  7. #7
    Registered User
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    Jul 2009
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    17

    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    Hi,

    Thanks for the suggestion...
    I was using R_AVKON_STATUS_PANE_LAYOUT_EMPTY which was crashing the application in QT 4.7 but not in 4.6.3.
    Please suggest an alternative of this 4.7.

  8. #8
    Nokia Developer Expert
    Join Date
    Nov 2003
    Posts
    43

    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    @chandra.sharmilla: Can you file bug reports to http://bugreports.qt.nokia.com with good description what is happening and also with examle code how the crash can be reproduced and post the links here? There are many possible root causes for crashes

    @rduchesneau: would be good to know more about the problem you have since Qt 4.7 is what we will start pushing for heavily during 2011 and we must sort out what kind of build issue you have. More details would certainly help us to resolve the issue you have.

    Keep in mind that we don't recommend to use Qt 4.6.2 to build applications for Symbian devices and you should use Qt 4.6.3 or preferrably the Nokia Qt SDK which is based on Qt 4.6.3.

  9. #9
    Regular Contributor
    Join Date
    Oct 2008
    Location
    Oslo, Norway
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    329

    Re: app does not launch when on QT 4.7 but works fine on QT 4.6.2

    Hi,

    Quote Originally Posted by chandra.sharmila View Post
    I was using R_AVKON_STATUS_PANE_LAYOUT_EMPTY which was crashing the application in QT 4.7 but not in 4.6.3.
    What was the reason for using AVKON-specific code? If you want to get rid of the status pane while having the softkeys visible, you can use fullscreen mode with Qt::WindowSoftKeysVisibleHint. (Note that there are some problems in old non-touch S60 devices, see QTBUG-11578).

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