Forum Discussion

ChiefBrian's avatar
ChiefBrian
Contributor
15 days ago

QT - Error No such interface supported

Has anyone been able to test modern QT applications 6.7 or 6.8 and get it to work.

I cannot even get the simple example applications from QT to function.  According to support currently 6.7 and 6.8 are supported, but neither seem to work.

Just using the object browser shows error for most items, and none of the QT related methods are even displaying or accessible. 

See attached image.

Any one have a solution to this?

**I tried to upload a small zip file that contains the QT sample app, but the forum prevents it from being uploaded.

Desktop Testing

5 Replies

  • Hassan_Ballan's avatar
    Hassan_Ballan
    Icon for Champion Level 2 rankChampion Level 2
    14 days ago

    Can you download the sample referenced at the page bottom in https://support.smartbear.com/testcomplete/docs/app-testing/desktop/qt/index.html to try it out, and does it work for you as expected?

    As per your statement "According to support currently 6.7 and 6.8 are supported" is not inline with TestComplete documentation https://support.smartbear.com/testcomplete/docs/app-testing/desktop/qt/about.html#General reference.
    TestComplete supports testing Qt applications that are built using a Qt-supported LTS version (5.15 and 6.2), and that were created with a Microsoft® C++ Compiler. You can use the compiler shipped along with Microsoft Visual Studio 2010 and later to compile your applications. Qt library can also be integrated into any other IDE (for example, into Qt Creator).

    💬 If a response helped you out, don’t forget to Like it! And if it answered your question, mark it as the solution so others can benefit too.

  • ChiefBrian's avatar
    ChiefBrian
    Contributor
    12 days ago

    Hassan,

    The documentation is incorrect.  If you look at the release notes for version 15.72 you will see they added support for 6.7.  I confirmed with the support team that 6.8 is also supported.  6.8 is the LTS version so not sure why they even mention 6.7.  With that being said it doesn't appear to work correctly.

    Thanks

    • Hassan_Ballan's avatar
      Hassan_Ballan
      Icon for Champion Level 2 rankChampion Level 2
      12 days ago

      Hi ChiefBrian​ 

      Yes, you are correct, TestComplete version 15.72, released on February 5, 2025, added as an improvement Qt 6.7 support https://support.smartbear.com/testcomplete/docs/general-info/version-history/features-added-to-ver-15-72.html 

      However, it's important to note that TestComplete's official documentation specifies support for Qt applications built with Qt versions 5.15 and 6.2, which are considered Long-Term Support (LTS) versions. 

      Desktop is not my expertise and as no one else in the community responded you will need to further engage with support.

      To debug and isolate, as I requested in my earlier post, it would help if you download the sample and try it out. If it does not work for you, it means we are looking in the wrong place.

      • ChiefBrian's avatar
        ChiefBrian
        Contributor
        12 days ago

        QT 6.2 is no longer in LTS it ended last year.

        I do not know why Smartbear has not updated their documentation that is on them, but the current release of TC does not support QT 6.2 at all. That support was removed with the 15.72 update, and per support that was on purpose(doesn't make sense to me, but that is what we have been told).

        I have already reported the issue to support, just looking to see if others are experiencing the same issue or have tried it because I am hoping for a quicker solution than waiting the support team.

        Thanks