Connecting signals from C++ application with Python?

[NoRulez]

Hi everyone,

I have a C++ application which loads the *.ui files dynamically with the QUiLoader.
For this example MyWidget.ui

Now I want to add the connections for QDial and a QLabel in the Python file (MyWidget.py).

What works in C++ currently is to get the QWidget* from the QUiLoader and access the items with findChildren<QLabel*>().

Can someone please help?

[JonB]

@NoRulez
Why aren't you using Qt + Python + PySide/PyQt for everything? I don't think it will be easy to connect across languages.

You can try the findChildren() approach for Python, if that does whatever you want.

[SGaist]

Hi,

What exactly are you trying to do ?
Port your C++ code to Python ?
Use your C++ code in a Python application ?

[NoRulez]

@SGaist The main application is written in C++ and I want to extend it with python scripting

[JonB]

@NoRulez
Here is my $0.02, unless/until someone else knows better.

To add "Python scripting" to a C++ program you are best searching for C++ to Python scripting, not to do with Qt. That will be possible.

However, you (apparently) want to be able to handle Qt stuff like signals/slots from your Python "scripting". In order to call and deal with Qt stuff from Python you (normally) need a set of Python bindings/library, as provided by either PySide or PyQt. But these (again, normally) provide and require a full program written with them. I don't know how/whether they would allow you have Qt (with its event loop etc.) in a C++ program and somehow "connect" to that.

If that cannot be done could your "scripting" be done without any reference to anything Qt?

[SGaist]

Hi,

You might want to check the Scriptable Application example as a starting point.

[JonB]

@SGaist
Interesting, didn't know about that page. Not sure how complex it is. I wonder how it will cope with, say, signals connected to multiple slots written in different languages.