2

This code Using PyQt5 extracted from http://www.tutorialspoint.com does not work when I add it in a script in the console of QGIS 3.16. Can you enlighten me on this subject?

import sys
from PyQt5 import QtGui

def window():
    app = QtGui.QApplication(sys.argv)
    w = QtGui.QWidget()
    b = QtGui.QLabel(w)
    b.setText("Hello World!")
    w.setGeometry(100,100,200,50)
    b.move(50,20)
    w.setWindowTitle("PyQt")
    w.show()
    sys.exit(app.exec_())
    
    if __name__ == '__main__':
       window()
5

I think the original code have a different indentation :

import sys
from PyQt5 import QtWidgets

def window():
    app = QtWidgets.QApplication(sys.argv)
    w = QtWidgets.QWidget()
    b = QtWidgets.QLabel(w)
    b.setText("Hello World!")
    w.setGeometry(100,100,200,50)
    b.move(50,20)
    w.setWindowTitle("PyQt")
    w.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    window()

It's a code to create a widget with a label Hello World! inside a QApplication app loop.

But, when you launch QGIS, it's already a Qt application with its own loop. So, the working code will be :

import sys
from PyQt5 import QtWidgets

def window():
    w = QtWidgets.QWidget()
    b = QtWidgets.QLabel(w)
    b.setText("Hello World!")
    w.setGeometry(100,100,200,50)
    b.move(50,20)
    w.setWindowTitle("PyQt")
    return w


w = window()
w.show()
3
  • Thinks, It's OK, but after i shall like to install in this box coordinates (X,Y) and an EPSG etc... to create a points or lines. Where can I found examples dealing with this problem. Have you an idea about this. – M. Labriki Feb 4 at 16:32
  • I suggest you to start with the official documentation : docs.qgis.org/3.16/en/docs/pyqgis_developer_cookbook/plugins/… and to install Plugin Builder QGIS plugin to have a plugin with a simple dialog you can modify and improve. After, you have to know Python and how to develop with PyQt. – J. Monticolo Feb 4 at 16:41
  • Im going to try this. Think you for your help and for your advice. – M. Labriki Feb 5 at 8:33

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