PyQt loading libraries, what is wrong there?

[SGaist]

Hi,

Not a direct answer but wouldn't it be simpler to create bindings the same way PyQt does for your custom set of widgets ?

[ilian]

@SGaist I am really not a python/PyQt expert, so I have no idea about how to do that, but I will do some research, thanks.

[SGaist]

Take a look here. PyQt uses sip to create the bindings. At the bottom of the page you can find an Qt example.

[ilian]

@SGaist I don't want to deal with that SIP thing, I want to keep as Qt as possible for the other team members. I was able to use QPluginLoader and get a QObject instance in the damned PyQt, however I am stuck with the lacking of qobject_cast<> which can cast to the interface, and I have no idea how to implement the classic C++ interface in the PyQt thing. Also the internet lacks any sophisticated info :(

[ilian]

What I came into my mind, which can be considered an ugly hack, it to dump a QWidget to a char array, then cast it to QWidget again using C union

union WidgetData
{
        QWidget w;
        char data[sizeof(QWidget)];
};

but even then, I can't cast anything ... Really, I don't want to bother with that SIP thing, I want to keep it as simple as possible, and there must be some way, I'll try with Python.h to see if cant be done there, but this is really frustrating from PyQt side, not to have a simple example for the QLibrary and QPLuginLoader....

[jsulm]

@ilian "I don't want to deal with that SIP thing" - do you think it is better to hack around with manual library loading and some dirty hacks like the union? PyQt already provides nice Qt integration in Python using SIP - it would be better to do it in the same way.

[ilian]

@jsulm It's a huge task I can't handle the whole task writing over 200 classes in that SIP modules. What I want is just to bridge existing slots in a C++ program to a PyQt based program, so the PyQto to be able to send signal/slots to the C++ program. That's why I want to be able to extract an Qt stuff from the library, which is C++. If I go into the SIP thing I will be totally lost.

[ilian]

Also the examples are all for PyQt4 , and I am using PyQt5 that leads me to even further obfuscation.

[ilian]

I am trying PyQt4 example in the SIP site, it fails me building a Qt module. Even with a copy/pasted code it gives me missing sbf files and cannot find QtGui\QtGuimod.sip . I don't know how people deal with this thing anymore.

[ilian]

I was able to fight trough the SIP, if somebody needs an example: here it is:
https://github.com/heatblazer/pyqtlibtest/tree/master/sip

@SGaist thanks for the referal, it was a hard task but there is no way around.
@jsulm Seems like I could not avoid SIP :(