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Editorial Team
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Asked: 2026-05-23T15:03:28+00:00

I have been working with Qt and Visual Studios 2008 for a while now.

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I have been working with Qt and Visual Studios 2008 for a while now. However, the other day after a reboot, the add-in to visual studios stopped working.

What’s working:

  • templates and wizards.
    I can add new items either ui, qrc, or even projects (although I
    haven’t tried it)
  • Building existing projects – any files already setup to moc or uid or whatever, that works fine.

What’s not working:

  • The Qt menu is not there. I can’t access the Qt project properties (usually found when right-clicking on a project)

  • Using the Qt editors such as Designer. When I double-click a UI file, I get the following error:

    “Couldn’t connect to QtAppWrapper server Expected server address
    127.0.0.1:12005

  • Any automatic ‘stuff’ that VS used to do. Ex. When you add the Q_OBJECT macro, it would add your generated files to the project.

What I have tried/investigated:

I have tried rebooting, restarting VS, un-installing and re-installing the Qt Addin, upgrading to a new version of the Qt Addin. All to no avail.

There doesn’t appear to be any trouble-shooting help on the Qt web-site. I saw someone asked a similar question on the Qt forums, but there was no answer.

I was working with 1.1.7, I upgraded to 1.1.8 to see if that would help.

Any ideas? Thanks in advance for any help.

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1 Answer

  1. Editorial Team

    The problem appears to be with Visual Studios. It was unable to read the .addin file.

    So if you look in the add-in manager you will notice that any add-ins using .addin files are not listed.

    The actual problem is with the MSXML components installation. I had v4.0, but there could be issues with other versions as well.

    For a fuller explanation see here.

    So following their suggestion I uninstalled MSXML, (v4.0), and installed the 6.0 SP1 version that they linked to. At that point, all the .addin defined addins appeared in the add-in manager. At this point, you may have to re-enable it.

    In my case, I had to un-install the Qt add-in, and re-install it before it worked completely.

    I had the error “QtAppWrapper can’t be found in the installation directory”

    But upon re-installation of the addin, everything starting working perfectly.

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