I wrote a code who display in a GUI, the steps of calcul of an algorithm. For this, i use a QThread which is in charge to check the steps and display it in a GUI. This alone is working. However, the first step for the user is to select a configuration file with a QFileDialog. And at this level, Python code crashes after the openning of the QFileDialog if a file is not selected after several seconds. The crash occures when the mouse goes over the QFileDialog window openned. I quite new with the use of QThread. I started with this post Background thread with QThread in PyQt. If someone could help me understand where is my error, that would be great! Thanks!
# main_thread_simple.py
from PyQt5.QtCore import QThread
from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QGridLayout, QFileDialog
import sys
import worker_simple
import os
#https://stackoverflow.com/questions/6783194/background-thread-with-qthread-in-pyqt/6789205
class Form(QWidget):
def __init__(self):
super(Form,self).__init__()
self.label1 = QLabel("")
self.label2 = QLabel("")
self.label3 = QLabel("")
self.label4 = QLabel("")
self.label5 = QLabel("")
self.label6 = QLabel("")
self.label7 = QLabel("")
self.label8 = QLabel("")
self.label9 = QLabel("")
self.label10 = QLabel("")
self.label11 = QLabel("")
fileName, _ = QFileDialog.getOpenFileName(self,"Sélectionner le fichier de configuration", filter = "(*.xlsx)")
repertoire_fichier_configuration = os.path.basename(fileName)
self.obj = worker_simple.Worker(repertoire_fichier_configuration) # no parent!
self.thread = QThread() # no parent!
# 2 - Connect Worker`s Signals to Form method slots to post data.
self.obj.strReady1.connect(self.onStrReady1)
self.obj.strReady2.connect(self.onStrReady2)
# 3 - Move the Worker object to the Thread object
self.obj.moveToThread(self.thread)
# 4 - Connect Worker Signals to the Thread slots
self.obj.finished.connect(self.thread.quit)
# 5 - Connect Thread started signal to Worker operational slot method
self.thread.started.connect(self.obj.Main)
# * - Thread finished signal will close the app if you want!
# self.thread.finished.connect(app.exit)
# 6 - Start the thread
self.thread.start()
# 7 - Start the form
self.initUI()
def initUI(self):
grid = QGridLayout()
self.setLayout(grid)
grid.addWidget(self.label1,0,0)
grid.addWidget(self.label2,1,0)
self.move(300, 150)
self.setWindowTitle('outil de calcul')
self.show()
def onStrReady1(self, txt):
self.label1.setText("{}".format(txt))
def onStrReady2(self, txt):
self.label2.setText("{}".format(txt))
app = QApplication(sys.argv)
form = Form()
sys.exit(app.exec_())
del app
# worker.py
from PyQt5.QtCore import QObject, pyqtSignal, pyqtSlot
import os
from PyQt5.QtWidgets import QFileDialog
class Worker(QObject):
finished = pyqtSignal()
strReady1 = pyqtSignal(str)
strReady2 = pyqtSignal(str)
def __init__(self, fichier_config, parent = None):
super(Worker, self).__init__(parent)
self.fichier_config = fichier_config
@pyqtSlot()
def Main(self): # A slot takes no params
nom_fichier_configuration = self.fichier_config
self.strReady1.emit('début des calculs')
''' code qui s'execute + appel à une fonction qui prend comme paramètre 'nom_fichier_configuration' '''
self.strReady2.emit('fin des calculs')
self.finished.emit()
