Language Bindings

**My first problem has been resolved, so I will close this, and open a topic for my new problem.

For future people who come to this topic : The solution for "Device not open" was to use "start function" instead of "execute function".

Thank you people for helping me.**

Did you also check this https://cgit.kde.org/perlqt.git ?

@aidanikuz please watch following video to install and use pyqt5

https://www.youtube.com/watch?v=yqHiOesB-nI

yes.
I guess it might be encoding problem . I set the UTF8 encoding in the options,but it didn't solve the problem.
Platform:
QT version :Android for armeabi-v7a (GCC 4.9, Qt 5.9.3 for Android armv7)
OS: windows 10
Qtcreator version: 4.7.2
Compilers: Android gcc arm-4.9, JDK1.8
Thanks.

@blue34 I haven't tried grpc before. It uses protocol buffers though which I have used and aren't a bad way of doing things.

I've never much cared for RPC mechanisms but whatever is easy for you to get implemented in the C++ side and the Java side is a decent way to do things. :)

Like I said I always go the other way... native c++ library with the front end in java (android) and ios (objc). I've been trying out djinni for that lately and it makes the jni and what not nice and easy. Wrong direction though so that won't help you out much.

@vivekyuvan

As @sierdzio already said, you cannot directly call C++ from C, and therefore you cannot use Qt.. But it is possible to write a wrapper, like discussed here: https://stackoverflow.com/questions/3583353/calling-c-class-member-function-from-c-code

From within the C++ class, you can access all kind of Qt stuff again.

I can't explain difference between case 2) and 3).

However, what you see in 1) is that signal-slot connections are always executed in order in which connections were made (hint: don't depend on this, though). So, when you connect in your plugin, you always do it after main program already had connected it's signals and slots - and thus your slots are executed after main program's, too.

Then in 3) you get immediate execution because (probably) there was no connection made in main program for that particular triggered() signal - you are first in queue.

Why 2) and 3) show different behaviour - I don't know.

Have you doublechecked how things should be run inside Maya?

I suggest you try running the code as a standalone Python QT app first. For that, your code will need to also instantiate a QApplication object and then run the _exec method on it. That may actually be the reason why you're seeing nothing...

@JonB @SGaist Thanks for taking the time to reply. Sorry I've done a bad job of explaining.. The issue is not with the scanning or sorting at scan time.

I'm using a QRunner thread which recursively scans the directory tree, then creates QStandardItem for each file/directory/symlink and puts them into a QStandardItemModel, which is associated with a QTreeView - The scanning and initial sorting (whilst scanning) work perfectly fine.

Cnce scanning is complete, a user can use the column headers to change the sorting (i.e. via Name or Type), if I rely upon the default sorting, it causes the UI to freeze whilst the sort is processed. If I use a QSortFilterProxyModel, this freezing does not happen (UI remains interactive and sort is much quicker), but, the problem is, I'm getting the on-selection glitch that I showed above (if I scroll the tree or resize the window, it forces a redraw and fixes it self).

I would provide the code.. but, it's a hell of a mess (this is not my day job, I'm just experimenting/playing in the evenings)

I've come to the conclusion its a bug / anomaly as I've got the same issue with both PyQT5 and PySide2.. So think I'm going to put this to bed, and move onto something else.

I don't know if you opened this bug: https://bugreports.qt.io/browse/PYSIDE-819
but there is already a patch being reviewed related to a RTTI issue and WebEngine in PySide2, maybe we can continue the discussion there or maybe you can certainly open a new report

I don't know if I got the question right,
but the kind of interaction you describe could be possible by "extending" and existing Qt/C++ application to use Qt/Python code.

Take a look at this example: https://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/scriptableapplication
There, there is a Qt/C++ Window that shows some Python code which you can run and interact with the Qt/C++ object itself.

Please be aware that many things need to be consider, and that you must handle the embedded Python and generate Python bindings for your Qt/C++ potion of code that you want to interact with.

Another use-case which was based on that example, is the research that is currently on-going regarding extending QtCreator with Python:
https://blog.qt.io/blog/2018/08/15/python-extensions/

I hope those cases are in the same direction as your question.

Yes, it's supported.
You can take a look at the following example which passes the --style argument.
http://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/declarative/textproperties/main.py

Hello,
do you have some logs related to the build process?
It seems to me that there is a mismatch between Qt and PySide2 versions.

Which version of Qt did you use?
and which branch of PySide2?

What mistake was it ? It might be useful for other people having the same trouble as you.

Hi @sierdzio

Thanks for the reply!

The API already sends IDs in both formats: int (or double) and string.

If that is the case I will use strings in my code.

Thank you very much.

Regards.

From what's on the report, QtQuick would be a better choice for the UI in that case.

@spanara
I would assume you will have to do your steps --- how else would the button know to change its text?

But with your "many widgets" you should not have to write code for each widget to handle this/update itself. You should be able to loop over all of them doing the updates in one go.

PyQt is a wrapper on top of Qt, what happens within the Qt classes is on the C++ side.

@pleaseHelpSteve: What worked for me is using QStringModel as described here https://stackoverflow.com/questions/50609986/how-to-connect-python-and-qml-with-pyside2 (or here http://doc.qt.io/qt-5/qtquick-modelviewsdata-cppmodels.html)