Qt 6

This is now marked as a bug:
https://bugreports.qt.io/browse/QTBUG-103558

Hello again guys, I hope you're all doing well.

So I tried what you all suggested and it finally worked.
Thank you so much for your precious time, advices and patience.

@Christian-Ehrlicher any installer checks and verify the requisites before install anything.

Bit of a grave dig and shameless plug, but in case anyone else stumbles upon this, while we wait for Qt6 to add the planned cross platform version of the old QWinTaskbarButton, I have effectively re-implemented the class in a small library:

https://github.com/oblivioncth/Qx

The API is mostly the same as the original, though with minor differences. Primarily, the interface for manipulating the progress indicator was moved into the main button class instead of being a separate one.

See specifically: https://oblivioncth.github.io/Qx/class_qx_1_1_taskbar_button.html

Note the 4 in your lib's names. You'll need to migrate them first so QtGui4.lib -> Qt6Gui.lib and so on.
qtmain.lib is now called Qt6EntryPoint.lib

QtWebkit, as Christian mentioned, is no longer part of Qt and was replaced by QtWebEngine.

I knew it was something silly, thanks!

DEPENDENCIES is only relevant for resolving dependencies between QML modules at runtime, or for tools like qmllint.
It does not affect linking relationships at all.

I suggest you push your current project state to some repository (like github) and share it and the errors you get, because it's not entirely clear what fails at the moment.

For example in your post at https://forum.qt.io/post/711286 you link Qt6::Multimedia into appSynth rather than Synth.

To ensure Multimedia symbols are found, you need to link Qt6::Multimedia into the target whose sources uses multimedia symbols.

Within qt_add_qml_module, you have to include all SOURCE classes/functions that are used.
For example, if I made my Synthesizer class depend on another class, AudioMakers then the source (AudioMakers.h & AudioMakers.cpp) must be in the SOURCE list and omitting them gives the same errors.

I'm not sure I understand this statement.
All sources both (.cpp and .h) should indeed be specified as sources. either via qt_add_qml_module's SOURCES option or using target_sources.

@JonB Thanks. This QGraphicsProxyWidget is what i needed."

Guys I'm really sorry, I should have called the copy function so that it can be executed.
Now I get a QList full of values.

Sorry again, a simple lack of attention made things go wrong.
@jsulm @JonB @JonB Thank you for your precious time and patience

@Christian-Ehrlicher said in Collisions with custom QGraphicsItem that inherits from QObject:

@JonB But it will behave exactly as his class wrt to the pointers:

Absolutely true! Hence I said

Apart from the answer @Christian-Ehrlicher has given to the question you ask.

This is just a suggestion for if OP does want equivalent for the class CustomRect : public QObject, public QGraphicsItem. Not that it will change any behaviour wrt to pointers question.

@JoeCFD the first post in this topic contains the code that's needed to replicate the issue. You'll need an X server without a window manager though; I have mentioned how I can get one on Windows but I'm not sure how exactly the setup can be replicated in Linux etc.

@LouieLoay
That only tells you what your Qt Creator IDE version is, and what version of Qt it uses internally. You need to look at what version of Qt itself you are using for compiling/running your code, which may not be the same.

Having said that, your Creator is a pretty old version (5.5/2015), so that might be indicative you also use an old-ish version of Qt. I do not know at which version of Qt support for ModBus/CANBUS was introduced. Whichever route you go, you are likely to want a newer version of Qt than 5.5.

@satyanarayana143 And you do not have any other MinGW or MSYS installations on your machine?
Try to add

CONFIG += c++17

to your pro file if you use QMake, else add

set(CMAKE_CXX_STANDARD 17)

to your CMakeLists.txt file.

Hello again,
Thank you for all the precious information.