How to change widget shape in QtDesigner ?

[giorgik]

As I feared, the build went on for 5 hours and then stopped due to various errors on the *.c code. At this point, I give up using custom plugins and use Qt 6.5 in Visual Studio C++ 2022. But I wonder when Qt will decide to create a QtCreator and Qt Designer environment for recent Visual Studio C++, without doing Qt Creator / Designer on different types of builds...

[d_stranz]

But I wonder when Qt will decide to create a Qt Creator and Qt Designer environment for recent Visual Studio C++, without doing Qt Creator / Designer on different types of builds...

Probably never. Qt Creator and Qt Designer are on different release cycles from the Qt Framework.

But it doesn't matter - Creator and Designer are independent programs. You configure them to work with the version of Qt and the Visual Studio compilers that you have installed. Those two programs can be written using any version of Qt and built with any compiler. If you build a Qt distribution from source code, then these applications will be built using that version, but if you download a pre-built distribution, then they will be built using whatever tools the Qt team uses.

Since Microsoft released version 1.40 of the VS Platform Toolset (current version is 1.43), all binaries built with any 1.4x toolset are compatible, so you can use any version of Qt compiled with a 1.4x toolset with Visual Studio 2022. I used Qt 5.14.2 compiled with VS 2015 (and D/L from Qt website) for a long time with VS 2022 until I needed some features from 5.15.3 and had to build that from source code.

I think the problems you have been having are due to your configuration, not to your Qt Creator, Qt Designer, or Qt framework versions.

then stopped due to various errors on the *.c code.

I saw similar errors, but everything I needed for desktop GUI development was built. If your build got to the point where all of the libraries you need were compiled, then you should be able to run "nmake INSTALL" to copy the files into your installation folder that you specified in the "prefix" option for the build.

[giorgik]

Finally I managed to compile the test program for the led plugin and to be able to vary the properties of the plugin within the Qt Designer, both for the shape field and for the color field, which now finally can vary the shape and color of the led on the form in Qt Designer as I wanted. This result was obtained thanks to the constant help of d_stranz in the post "AnalogClock::staticMetaObject': definition of dllimport static data member not allowe".