Language Bindings

@Codmasters said in How change a Variable from another class:

the code gives me "False" instead of TRUE

This has nothing to do with Qt, first try to learn C++, there are many online trainings available.

@SGaist It's just that your predictions are uncanny, i.e. scary ;-)

Thank you all for the discussion

I have this same problem on Qt Creator 4.12.2 (From revision 33c5ff216a) but I don't have Clang anywhere on my system, other than the distribution that comes with Qt. I am using Qt 5.15.0 with MSVC2019.

It doesn't seem like there is a way to download the linked beta build any longer as the listed artifacts are not in anyway hyperlinked, though perhaps you have to go somewhere else that I'm missing.

I was using Qt 5.14.3 with MSVC2019 on another system without issue but it hasn't been updated in a while so I guess the 16.5 update was the issue.

I'm guessing that even though it has been a bit since this issue was posted that the latest official version of Qt Creator still using Clang 8.0.

Is there another link to that beta build that anyone has?

EDIT:

Never mind, I eventually correctly guessed that you have to be logged into github in order to download artifacts from these builds for whatever reason.

Using this build also fixed the issue for me.

Thanks for the links !

I am preparing a patch to support QSerialPort in PySide2 here:
https://codereview.qt-project.org/c/pyside/pyside-setup/+/299976

Great !

Since you have it alive now please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found.

Sleep() function actually suspends the processing of the thread in which it is called by the operating system, allowing other threads and processes to execute while it sleeps. With multiple threads and processes, sleep() suspends your thread - it uses next to zero processing power.

@SGaist
Unfortunately I am locked into Qt4 with the program itself. Heck, I was even hoping I could somehow influence this Qt4 app by some external python app running Pyside2. I have no idea how any of the underlying Qt infrastructure works, but that seems very far from possible (at least for me)

My experience with PyQt5 and Pyside2 has been super pleasant and I feel really comfortable in Python, and not comfortable at all in C++, so that's why I'm looking around if there's an alternative.

Ill probably give this a go for starters: https://ubuverse.com/embedding-the-python-interpreter-in-a-qt-application/

@germyrinn
Hi, this was an old post of mine.

As I wrote, the problem is that for the £ sign e.g. read from a file created in the way I describe, decode("utf-8") gives me a UnicodeDecodeError. I found the only conversion which works is decode("cp850").

@SGaist
OIC. So

how to change the file name from German to English or vice-versa

The OP does not really mean change the filename (on disk)? Then there is no issue.

@Nick79
I resolved it. On my linux machine I had to install some gstreamer packages. Now everything works! Great

Hi and welcome to devnet,

QTextCodec comes to mind for that task.

@galou_breizh I answered in the other post. But it's not a good way to duplicate post for the same issue. Please try to avoid it in the future, thanks

@galou_breizh
I think point_size is too small and the ellipse generated is "pixelated" because of that.

This gives a nice circle filled with blue

# -*- coding: utf-8 -*- """Show an incomprehension in setScale for QGraphicsItemGroup.""" from PySide2 import QtCore from PySide2 import QtGui from PySide2 import QtWidgets point_size = 10.0 # In real-world units. # Get entrypoint through which we control underlying Qt framework app = QtWidgets.QApplication([]) scene = QtWidgets.QGraphicsScene() group = QtWidgets.QGraphicsItemGroup() scale = 50.0 # 1 real-world units = 500 px. !! Has no apparent effect. pen = QtGui.QPen(QtCore.Qt.red) brush = QtGui.QBrush(QtCore.Qt.blue) x = 1.0 # Real-world units. y = 2.0 # Real-world units. top_left = (x - point_size / 2.0, y - point_size / 2.0) ellipse = QtWidgets.QGraphicsEllipseItem( QtCore.QRectF(*top_left, point_size, point_size)) ellipse.setPen(pen) ellipse.setBrush(brush) ellipse.setScale(scale) group.addToGroup(ellipse) # group.setScale(scale) scene.addItem(group) view = QtWidgets.QGraphicsView(scene) view.show() # Start Qt/PySide2 application. If we don't show any windows, the # app would just loop at this point without the means to exit app.exec_()