Occasionally get "QThread: Destroyed while thread is still running" when running multiple threads

[jsulm]

@gunraidan said in Occasionally get "QThread: Destroyed while thread is still running" when running multiple threads:

libssl/libcrypto

It's the OpenSSL library which is needed if you want to access https URLs.

[gunraidan]

@jsulm said in Occasionally get "QThread: Destroyed while thread is still running" when running multiple threads:

OpenSSL library

I followed the directions here to go to this site and download the installer for Windows.

I still get the error though. :(

[jsulm]

@gunraidan You should rather install OpenSSL through Qt installer/maintenance tool. See https://stackoverflow.com/questions/68624474/how-to-deploy-qt-application-with-openssl

Also, this is only an issue if you want to access HTTPS URLs. For HTTP you do not need OpenSSL.

[gunraidan]

I'm not sure if I should make a new thread or not, so I'll just post this here.

I can't get self.d_name to print after the api function has been called:

from PyQt6 import QtNetwork
from PyQt6 import QtCore
from PyQt6.QtCore import QUrl
from PyQt6.QtGui import*
from PyQt6 import QtWidgets
from PyQt6.QtWidgets import*
import sys

json2qt = QtCore.QJsonDocument.fromJson

class MainWindow(QWidget):  
    def __init__ (self):
        super().__init__()
        self.title = "Window"
        self.left = 200
        self.top = 300
        self.width = 300
        self.height = 300
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top,self.width, self.height)
        self.start_button()
        self.show()
        
    def start_button(self):
        self.s_button = QtWidgets.QPushButton(self)
        self.s_button.setText('Start')
        self.s_button.clicked.connect(self.site_request)
        
    
    def site_request(self):
        url = 'https://pokeapi.co/api/v2/pokemon/pikachu'
        req = QtNetwork.QNetworkRequest(QUrl(url))
        
        self.nam = QtNetwork.QNetworkAccessManager()
        self.nam.finished.connect(self.handle_request)
        self.nam.get(req)
        
    def handle_request(self, reply):
        er = reply.error()
        if er == QtNetwork.QNetworkReply.NetworkError.NoError:
            qbyte = reply.readAll()
            pokemon_dict = json2qt(qbyte)
            self.d_name = pokemon_dict["abilities"][0]['ability']['name'].toString()
        else:
            print ("Error")
            print(reply.errorString())
            
    def get_all(self):
        self.site_request()
        print(self.d_name)

if __name__ == '__main__':        
    app = QApplication(sys.argv) 
    ex = MainWindow()        
    code = app.exec()
    sys.exit(code)

However, when I put self.d_name to print here:

  def handle_request(self, reply):
        er = reply.error()
        if er == QtNetwork.QNetworkReply.NetworkError.NoError:
            qbyte = reply.readAll()
            pokemon_dict = json2qt(qbyte)
            self.d_name = pokemon_dict["abilities"][0]['ability']['name'].toString()
            print (self.d_name)
        else:
            print ("Error")
            print(reply.errorString())

It prints out fine.

It should print out either way, it's a "self variable".

Anyone know what I'm doing wrong?

[JonB]

@gunraidan
It won't be about self (that bit is fine), it will be about when you try to print the value.

Firstly, you have print(self.d_name) inside a method get_all(). But since your code never actually calls get_all()....

Even if you did call it. site_request()calls self.nam.get(req). But QNetworkAccessManager.get() only initiates a GET request. It does not wait for it to complete and return. Only when finished signal is received and handle_request() is called does self.d_name = ... get executed. That happens asynchronously at a later time. So trying to access it immediately after calling site_request() is too early.