Qt for Python (PySide/Shiboken)

When Qt 6.0 is out, 5.15 will still have the patches on Gerrit, so if there are any issues you want to get fix, you will need to get the source for the latest 5.15 open soruce bug fix release, and then apply the patches. This is just stopping the release of further bug fixing releases. On your Open Source project, you have 3 options: 1. you stay with the latest open source 5.15.x 2. you cherry pick changes an generate your own 5.15.y thaty ou can use, 3. you move to qt6. I’m certain the technicallities of how the dev branch will work will be published soon.

do you have libclang in your path to compile the example?

I'm trying to compile with Visual Studio. In the readme there is no mention of libclang or clang.

First I simply installed PySide2 through pip, which also installed shiboken2. However, to compile the binding example it appears shiboken2-generator is needed. So I went to https://download.qt.io/official_releases/QtForPython/shiboken2-generator/ and downloaded the matching wheel (5.13.2). I was then able to compile using the first method (with NMake), but the resulting dll and pyd "can't be found". So, I tried the other suggested way, using Visual Studio. I was able to create a solution. Loaded it, compiled it and got the error: "STL1000: Unexpected compiler version, expected Clang 8 or newer".

Let me check that webinar, it seems to contain some useful info

It appears it can solve my problems, thanks! Also, I have another question. Is it possible in some way to access a wrapped c++ object from c++?

Maybe I can explain what I'm trying to do. I've been trying to find a solution for quite some time. I have a dll which is loaded by a software. The software knows the interface and so knows the methods to call. The interfaces, classes and methods are in a C++ library (not QT). I want to be able to bridge the dll to python and the cleanest way I found was through shiboken. Ideally, I would want to instantiate objects from the c++ library in python, but use them through the dll. I'm not sure if it's possible through shiboken, but maybe you have suggestions. Thanks.

I think the last bit is not possible, I mean creating bindings you will be able to create C++ object from Python, but you will be unable to modify them from C++.

The software in question normally instantiates the objects itself by calling a function pointer from the dll, which returns a new instance of a class contained in the library.

Sorry, but I don’t have experience with that scenario, but I really feel it will not be possible. I might be wrong 😕

My initial idea was to bypass the function pointer and basically give the calling software an instance (created in python) through a pointer that can be obtained through getCppPointer

I did something with pointer references…

Unless I misunderstood the usage of getCppPointer

Yes, by issue is audio related, specifically the VST protocol

I think your best bet at the moment, besides asking for feedback on the mailing list, is to grep inside the shiboken2/tests directory on the repo

I can pass the pointer to c++ and "use" it?

it’s the other way around

Definitely, looks like it has a wide coverage of cases that could be interesting for my application

In theory I don't really need to modify, only to call methods

I truly recommend you to ask for feedback on the mailing list: bit.ly/pyside2 or the IRC channel #qt-pyside on the Freenode server

Thanks

@Element25 the webinar video is live now (the one from the slides) https://www.youtube.com/watch?v=wOMlDutOWXI&feature=emb_title

Thanks again!

Hi I just wrote the python version of https://doc.qt.io/qtforpython/overviews/qtquick-customitems-painteditem-example.html to test it. I'm not sure where to propose it to share.

I'm listening

does I have to add the copyright at the beggining like other files ?