如何使用 pyqt5 运行 while 循环-尊龙凯时

问题描述

我在一个项目上工作:程序下载但我在使用 while 循环时遇到问题，用于检查与 internet 的连接，如果 true 不 settext('') to lable 和 if flase settext('anytext') to lable

i work on one project : program download but i have a problem with while loop for check the connection with the internet and if true doesn't settext('') to lable and if flase settext('anytext') to lable

连接检查方法

    def checkinternetconnection(self,host="8.8.8.8", port=53, timeout=3):
    while self.conection==false:
        try:
            socket.setdefaulttimeout(timeout)
            socket.socket(socket.af_inet, socket.sock_stream).connect((host, port))
            self.conection = true
            return self.conection
        except exception as e:
                print(e)
                self.label_9.settext('please check internect connection')
                self.conection = false
                return self.conection
    self.finished.emit()

我已经厌倦了 qthread .请问我该怎么做:)?如果连接丢失=false settext('check internet') 以及连接变为 true 时，应用程序正在运行时 settext('')

i have tired with qthread . please how i can do it :) ? and when app is running if connection is lost=false settext('check internet') and when the connection become true settext('')

构造者

from_class,_=loaduitype(os.path.join(os.path.dirname(__file__),'designe.ui'))
class mainapp(qmainwindow,from_class):
    finished = pyqtsignal()
    def __init__(self,parent=none):
        super(mainapp, self).__init__(parent)
        qmainwindow.__init__(self)
        super().setupui(self)
        self.handlegui()
        self.handlebutton()
        self.setwindowicon(qicon('mainicon.png'))
        self.menubarw()
        self.conection = false

主代码

def main():
    app = qapplication(sys.argv)
    window = mainapp()
    window.checkinternetconnection()
    window.show()
    app.exec()
if __name__=='__main__':
    main()

推荐答案

qthread不要太复杂，使用线程库:

do not get complicated with qthread, use the threading library:

def main():
    app = qtwidgets.qapplication(sys.argv)
    window = mainapp()
    threading.thread(target=window.checkinternetconnection, daemon=true).start()
    window.show()
    app.exec()

另一方面，由于您使用的是线程，因此不应从另一个线程更新 gui，为此您可以使用 qmetaobject::invokemethod:

on the other hand, since you are using a thread, you should not update the gui from another thread, for this you can use qmetaobject::invokemethod:

def checkinternetconnection(self,host="8.8.8.8", port=53, timeout=3):
    while true:
        try:
            socket.setdefaulttimeout(timeout)
            socket.socket(socket.af_inet, socket.sock_stream).connect((host, port))
            self.conection = true
        except exception as e:
            self.conection = false
            print(e)
        msg = "" if self.conection else 'please check internect connection'
        print("msg", msg)
        qtcore.qmetaobject.invokemethod(self.label_9, "settext",
            qtcore.qt.queuedconnection,  
            qtcore.q_arg(str, msg))
    self.finished.emit()