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    <p>I'm going to explain a little bit how things work and the relationships between the files, and hopefully this will solve your problem.</p> <p>When you edit the ui file using the designer all changes are made to the ui file itself. Then when you build a couple of things will happen.</p> <p>First... a custom build step will be run on the ui file. This build step runs "uic" as Macke said, and will generate a file called "ui_thenameofyouruifile.h". Where this file is located depends on your project settings, but if you look in your project you should see a folder called Generated Files in your project. </p> <p><img src="https://i.stack.imgur.com/v2j8W.png" alt="enter image description here"></p> <p>If you look in there you should see the newly generated file. This is the code that is "changed" when you make changes to your form. Now if this file is not updated, or does not exist at all, then somehow your project settings got messed up. In this case I would remove your .ui file from the project and re-add it. The add-in should do it's magic and add all the stuff you need. Build again and it should work. (I assume that is probably your problem)</p> <p>The second thing that should happen when you build, is that the class that uses your ui file should recompile. Generally when you create a ui file, you also create an accompanying .h and .cpp file. This is where we do any of the fun logic that we might need in our window. The Qt designer will never ever change this class.</p> <p>In the header file we refer to the ui file by doing this:</p> <pre><code> namespace Ui { class thenameofyouruifile; } #include "ui_thenameofyouruifile.h" </code></pre> <p>and then we add a member variable </p> <p>Ui::thenameofyouruifile UI;</p> <p>There are a couple of ways to do this, but basically that's the idea. The add-in is supposed to configure your project so that the directory where the generate files go is included in the "additional include directories" in your project settings, but that is another place to check to make sure that your code is really linking with the correct generated file.</p>
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    1. COhi, you said "The Qt designer will never ever change this class." to be honest that was my mismatch. I feal very stupid now lol, generated files are OK, but I thought Qtdesigner will put some skeleton code into my class source so I can continue puting my code into. at least thats the case when using CLR forms.. VS will put those skeleton codes so you can just continue puting your own, sadly that's not the case with Qt-addin. thaks alot to you and others for explaining!!
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