4. 5.0.1 - "Cannot create accessible interface for object" warnings

5.0.1 - "Cannot create accessible interface for object" warnings


  • Just finished a custom Qt5.0.1 build and noticed an *extensive *amount of what I assume are warnings, coinciding with a significant performance loss of about 25% compared to Qt5.0 and none of those warnings. Here is a short snapshot of what the warnings look like:

    @...
    Cannot create accessible interface for object: QProgressBar(0x35fb30, name = "prog")
    Cannot create accessible interface for object: QProgressBar(0x35fb30, name = "prog")
    Cannot create accessible interface for object: QProgressBar(0x35fb30, name = "prog")
    Cannot create accessible interface for object: QProgressBar(0x35fb30, name = "prog")
    Cannot create accessible interface for object: QLabel(0x3888d0, name = "uniqueWordsLbl")
    Cannot create accessible interface for object: QLabel(0x388850, name = "totalWordsLbl")
    Cannot create accessible interface for object: QLabel(0x3889d0, name = "textCharLbl")
    Cannot create accessible interface for object: QLabel(0x388a50, name = "sepCharLbl")
    Cannot create accessible interface for object: QLabel(0x388950, name = "totalCharLbl")
    Cannot create accessible interface for object: QLabel(0x388ad0, name = "timeLbl")
    Cannot create accessible interface for object: QLabel(0x388b50, name = "mcpiLbl")
    Cannot create accessible interface for object: QHeaderView(0x23de3c0)
    Cannot create accessible interface for object: QHeaderView(0x23de680)
    Cannot create accessible interface for object: QTableView(0x23de0c0, name = "tableView")
    Cannot create accessible interface for object: QHeaderView(0x23de3c0)
    Cannot create accessible interface for object: QHeaderView(0x23de680)
    Cannot create accessible interface for object: QScrollBar(0x23de280)
    Cannot create accessible interface for object: QTableView(0x23de0c0, name = "tableView")
    Cannot create accessible interface for object: QTabBar(0x23781b0, name = "qt_tabwidget_tabbar")
    Cannot create accessible interface for object: QWidget(0x2378470, name = "qt_scrollarea_viewport")
    Cannot create accessible interface for object: QPlainTextEdit(0x2378430, name = "plainTextEdit")
    Cannot create accessible interface for object: QPushButton(0x2378bf0, name = "editBtn")
    ...@

    Also worth nothing I am getting those not only in debug but also in release mode. I assume the performance drop has to do with all that extra output I am getting.

    Ideas?

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  • Also, just noticed I get the warnings only on Windows 7 and Windows 7 Basic UI themes, switching to windows classic there removes the warnings and the performance drop.

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  • I have the same problem, why?

    0
  • Moderators

    Is there a "bug report":https://bugreports.qt-project.org/ about this? I am sure the developer working on accessibility would like to know about your experience.

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  • ^^ https://bugreports.qt-project.org/browse/QTBUG-29720

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  • Hi there,

    the Bug is still not resolved. It says "Need More Info", which I hope I can provide because I ran into the same issue. In case I am just missing something trivial, I would be grateful for hints. Here is how I reproduce the behaviour:

    I built Qt5 from the GIT repository (checked out yesterday) on Windows XP as described "here":http://qt-project.org/wiki/Building_Qt_5_from_Git using the MinGW 4.7 compiler included with the "Qt binary download":http://download.qt-project.org/official_releases/qt/5.0/5.0.2/qt-windows-opensource-5.0.2-mingw47_32-x86-offline.exe.

    For the build I used ActivePerl 5.16.3.1603 and Python-3.3.1.

    My configure options were:

    @configure
    -prefix D:/qt5-build
    -opensource
    -opengl desktop
    -no-icu
    -no-angle
    -no-native-gestures
    -no-audio-backend@

    "make install" ran through without interruption.

    Then, I build the Qt example
    \examples\widgets\dialogs\findfiles

    I add the following line to the findfiles.pro file:
    @CONFIG += console@

    Otherwise the "Cannot create accessible interface for object" warnings will not show at runtime.

    After "qmake" followed by "make release" the program findfiles.exe runs fine under my Windows XP.

    Now, I want to deploy it for a Windows 7 machine. So I copy the following files from the MinGW 4.7 compiler and from my Qt5 build bin directories into my deploy directory:

    • platforms/qwindows.dll
    • libgcc_s_sjlj-1.dll
    • libstdc++-6.dll
    • libwinpthread-1.dll
    • Qt5Core.dll
    • Qt5Gui.dll
    • Qt5Widgets.dll
    • findfiles.exe

    I run findfiles.exe on Windows 7 (with the "Windows Classic" UI theme), and everything works fine.

    When I change the UI theme to "Windows 7", however, I get the "Cannot create accessible interface for object" warnings in the console.

    As suggested in the "bug report":https://bugreports.qt-project.org/browse/QTBUG-29720 I set the environment variable QT_DEBUG_PLUGINS=1. Here is what output I get while just starting findfiles.exe and closing the window immediately after it appeared:

    @QFactoryLoader::QFactoryLoader() looking at "C:/mydeploy/platforms/qwindows.dll"
    Got keys from plugin meta data ("windows")
    loaded library "C:/mydeploy/platforms/qwindows.dll"
    Cannot create accessible interface for object: QLabel(0x45e4a8)
    Cannot create accessible interface for object: QLineEdit(0x438d68)
    Cannot create accessible interface for object: QComboBox(0x349900)
    Cannot create accessible interface for object: QLabel(0x45e5e8)
    Cannot create accessible interface for object: QLineEdit(0x45df88)
    Cannot create accessible interface for object: QComboBox(0x438d88)
    Cannot create accessible interface for object: QLabel(0x45e628)
    Cannot create accessible interface for object: QLineEdit(0x45e488)
    Cannot create accessible interface for object: QComboBox(0x45e0c8)
    Cannot create accessible interface for object: QPushButton(0x3497a0)
    Cannot create accessible interface for object: QWidget(0x48d998, name = "qt_scr
    ollarea_viewport")
    Cannot create accessible interface for object: QWidget(0x48ded8, name = "qt_scr
    ollarea_viewport")
    Cannot create accessible interface for object: QHeaderView(0x48deb8)
    Cannot create accessible interface for object: QTableWidget(0x48d958)
    Cannot create accessible interface for object: QLabel(0x45e668)
    Cannot create accessible interface for object: QPushButton(0x349840)
    Cannot create accessible interface for object: Window(0x28fe6c)
    Cannot create accessible interface for object: Window(0x28fe6c)
    QLibraryPrivate::unload succeeded on "C:/mydeploy/platforms/qwindows.dll"@

    Clicking any buttons in the findfiles program produces a lot more of these warnings. I hope that somebody can shed some light onto this. For findfiles there is no noticable performace loss, but with my actual application there is...

    Thanks a lot in Advance,
    Ludwick

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  • Moderators

    Please provide the information to the bug report, not the forum:-)

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  • Adding the file

    accessible/qtaccessiblewidgets.dll

    into the folder of my executable file, actually solved the problem!

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  • I have same problem with this warning bug under VS2010 with using static build.

    Solved by:

    1. importing plugin to my main.cpp:

    #include <QtPlugin>
    Q_IMPORT_PLUGIN(AccessibleFactory)

    1. adding to project options > Linker>Input>Additional Library Directories->$(QTDIR)\plugins\accessible

    2. adding to project options >Linker>Input>Additional Dependencies->qtaccessiblewidgets(d).lib (d -> depending on debug or release version)

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  • I have same problem.
    the Qt version 5.0.2

    0 1 Replies
  • Moderators

    @LuYong

    Please provide a detailed of your actual problem.
    Simply stating that you have the same problem does not get you anywhere.
    Version 5.0.2 is completely outdated.

    BTW you are necroposting.

    Vote the answer(s) that helped you to solve your issue(s)

    3

  • You need to include the directory "accessible" with the corresponding dlls under your application directory.
    That will solve your problem.

    Andres - http://www.visiondepatentes.com.ar

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