Python 3.x 在线程类的pyqt4中不显示setText（）或其他显示方法的任何内容

我用pyqt4和python3.3中的线程编写了一个简单的socket应用程序，但是我在运行Qt类命令时遇到了问题，比如在标签中显示消息或其他任何东西，只有python代码可以正常工作

不向我的gui中的S_标签显示任何内容

我使用两种方式在S_标签上显示任何消息，但两种方式都不起作用

自我评价

self.ui

代码：

self.ui.S_label.setText（“test！”）

self.\u ui.S\u label.setText（“测试！”）

self.ui.S_label.setText（“{0}:{1}已连接。”.format（addr，remoport））

对于这两种方式，

打印

效果良好：

打印（自身用户界面）

打印（self.ui）

打印

输出：

-

-

我做错了什么

我的代码：

from PyQt4 import QtCore, QtGui
from imigui import Ui_MainWindow

class imiserv(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.Sport_lineEdit.setMaxLength(5)
        self.ui.Sconnect_pushButton.clicked.connect(self.serv)

    def serv(self):
        self.sersock= socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sersock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        self.host= str(self.ui.Sip_lineEdit.text())
        self.port= int(self.ui.Sport_lineEdit.text())
        MY_LOCK = threading.Lock()
        class CountT(threading.Thread, imiserv):
            def __init__(self, ui, ser):
                super().__init__()
                imiserv.__init__(self)
                self._sersock= ser

                self._ui= ui
                print(self._ui)
                print(self.ui)
                self.ui.S_label.setText("test !")
                self._ui.S_label.setText("test !")

            def run(self):
                MY_LOCK.acquire()
                while True:
                    cliconn, (addr, remoport)= self._sersock.accept()
                    self.cstr= cliconn.recv(1024)

                    self.ui.S_label.setText("{0}:{1} is connected.".format(addr, remoport))
                    cliconn.close()

                    print(self.cstr)
                MY_LOCK.release()

        try :
            self.sersock.bind((self.host, self.port))
            self.sersock.listen(5)
            a= CountT(self.ui, self.sersock)
            a.daemon= True # for exit from thread when close gui
            a.start()
        except socket.error as err:
            self.ui.S_label.setText(err)

---

编辑（新问题）：

---

我对你的方式有一个新的问题：我在gui中添加了一个qtextedit，当我想在代码中设置它时

分段错误发生了，应用程序崩溃了

错误：

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QTextDocument(0x15c4460), parent's thread is QThread(0xfeb570), current thread is QThread(0x15d3900)
Segmentation fault

我的代码：

from PyQt4 import QtCore, QtGui
from imigui import Ui_MainWindow

class imiserv(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.Sport_lineEdit.setMaxLength(5)
        self.ui.Sconnect_pushButton.clicked.connect(self.serv)

    def serv(self):
        self.sersock= socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sersock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        self.host= str(self.ui.Sip_lineEdit.text())
        self.port= int(self.ui.Sport_lineEdit.text())

        MY_LOCK = threading.Lock()
        class CountT(threading.Thread):
            def __init__(self, label, ser, qtext):
                super().__init__()
                self._sersock= ser

                self._uilabel= label
                self._uiClog= qtext


            def run(self):
                MY_LOCK.acquire()
                while True:
                    cliconn, (addr, remoport)= self._sersock.accept()
                    self.cstr= cliconn.recv(1024)

                    self._uilabel.setText("{0}:{1} is connected.".format(addr, remoport))
                    cliconn.close()

                    print(self.cstr)
                    self._uilabel.setText(self.cstr) # it's ok!
                    self._uiClog.setText(msg) # Segmentation fault

                MY_LOCK.release()


        try :
            self.sersock.bind((self.host, self.port))
            self.sersock.listen(5)
            a= CountT(label= self.ui.S_label, ser= self.sersock, qtext= self.ui.Clog_textEdit)
            a.daemon= True # for exit from thread when close gui
            a.start()
            self.ui.S_label.setText("Connected !")
        except socket.error as err:
            self.ui.S_label.setText(err) # it's ok !
    self.ui.self.ui.Clog_textEdit.setText(err) # it's ok !

为什么?


编辑（新问题2）：

这是我的代码：

从PyQt4导入QtCore、QtGui
从imigui导入Ui_主窗口

类imiserv（QtGui.QMainWindow）：

这是交叉发生的错误，我应该为get事件按两次按钮，在linux中第一次显示错误，在windows中没有显示，第二次按事件发生（此错误仅在linux操作系统中显示）

下面的代码适合我（这里是Python 2.6）。我用
imiserv
删除了
CountT
的继承，并用QLabel
S_标签
替换了ui对象，取而代之的是
imiserv
实例。
pyqtsignal
允许线程计数将文本写入QLabel和QTextEdit：

import socket
import threading

from PyQt4 import QtCore, QtGui
from imigui import Ui_MainWindow

class imiserv(QtGui.QMainWindow):

    send_msg = pyqtSignal('QString', 'QString')

    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.Sport_lineEdit.setMaxLength(5)
        self.ui.Sconnect_pushButton.clicked.connect(self.serv)

        self.send_msg.connect(self.my_slot)

    def write_msg(self, lbl_msg, txt_msg):
        self.ui.S_label.setText(lbl_msg)
        self.ui.Clog_textEdit.setText(txt_msg)

    def serv(self):
        self.sersock= socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sersock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        self.host= str(self.ui.Sip_lineEdit.text())
        self.port= int(self.ui.Sport_lineEdit.text())
        MY_LOCK = threading.Lock()
        class CountT(threading.Thread):
            def __init__(self, parent):
                threading.Thread.__init__(self)
                self._parent= parent

            def run(self):
                MY_LOCK.acquire()
                self._parent.send_msg.emit("Waiting connections","")
                while True:
                    cliconn, (addr, remoport)= self.__parent.sersock.accept()
                    self.cstr= cliconn.recv(1024)
                    self._parent.send_msg.emit("{0}:{1} is connected.".format(addr, remoport), self.cstr)
                    cliconn.close()

                MY_LOCK.release()

        try :
            self.sersock.bind((self.host, self.port))
            self.sersock.listen(5)
            a= CountT(self)
            a.daemon= True # for exit from thread when close gui
            a.start()
        except socket.error as err:
            self.ui.S_label.setText(err.strerror.decode("utf-8"))
            self.ui.Clog_textEdit.setText(err.strerror.decode("utf-8"))

if __name__ == "__main__":
  import sys
  app = QtGui.QApplication(sys.argv)
  s = imiserv()
  s.show()
  sys.exit(app.exec_())

完全有效！！！谢谢，但是你能告诉我为什么会发生这个问题吗？？为什么继承不起作用？这样做有什么错？继承毫无意义，但我认为这不是问题所在。将lineedit小部件作为参数解决了问题。您的方式有一个新问题：我在gui中添加了一个qtextedit，当我想在代码中设置它时，出现了“分段错误”：QObject:无法为处于不同线程中的父级创建子级。（父线程是QTextDocument（0x15c4460），父线程是QThread（0xfeb570），当前线程是QThread（0x15d3900）分段错误，为什么？将文本写入QTextEdit会导致异常，因为它是在另一个线程中完成的。我不知道为什么这不是QLabel的问题。我编辑了我的答案：向imserv类添加了一个信号。该信号连接到设计用于在QLabel和QTextEdit中写入文本的插槽。该信号为emit注意，CounT类现在只有一个构造函数参数：imiserv实例。CounT实例现在可以访问套接字和pyqtsignal。是的，您可以使用
self.\u parent
访问imiserv实例的所有成员。这只是标准Python：您给一个类一个insta它允许您使用它的方法并访问它的属性。在您的情况下，这允许避免直接从线程中进行任何与Qt相关的调用。
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.3/threading.py", line 637, in _bootstrap_inner
    self.run()
  File "imiclilap.py", line 34, in run
    cliconn, (addr, remoport)= self._parent.clis.accept()
  File "/usr/lib/python3.3/socket.py", line 135, in accept
    fd, addr = self._accept()
OSError: [Errno 22] Invalid argument

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python3.3/threading.py", line 637, in _bootstrap_inner
    self.run()
  File "imiclilap.py", line 34, in run
    cliconn, (addr, remoport)= self._parent.clis.accept()
  File "/usr/lib/python3.3/socket.py", line 135, in accept
    fd, addr = self._accept()
OSError: [Errno 22] Invalid argument

import socket
import threading

from PyQt4 import QtCore, QtGui
from imigui import Ui_MainWindow

class imiserv(QtGui.QMainWindow):

    send_msg = pyqtSignal('QString', 'QString')

    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.Sport_lineEdit.setMaxLength(5)
        self.ui.Sconnect_pushButton.clicked.connect(self.serv)

        self.send_msg.connect(self.my_slot)

    def write_msg(self, lbl_msg, txt_msg):
        self.ui.S_label.setText(lbl_msg)
        self.ui.Clog_textEdit.setText(txt_msg)

    def serv(self):
        self.sersock= socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sersock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        self.host= str(self.ui.Sip_lineEdit.text())
        self.port= int(self.ui.Sport_lineEdit.text())
        MY_LOCK = threading.Lock()
        class CountT(threading.Thread):
            def __init__(self, parent):
                threading.Thread.__init__(self)
                self._parent= parent

            def run(self):
                MY_LOCK.acquire()
                self._parent.send_msg.emit("Waiting connections","")
                while True:
                    cliconn, (addr, remoport)= self.__parent.sersock.accept()
                    self.cstr= cliconn.recv(1024)
                    self._parent.send_msg.emit("{0}:{1} is connected.".format(addr, remoport), self.cstr)
                    cliconn.close()

                MY_LOCK.release()

        try :
            self.sersock.bind((self.host, self.port))
            self.sersock.listen(5)
            a= CountT(self)
            a.daemon= True # for exit from thread when close gui
            a.start()
        except socket.error as err:
            self.ui.S_label.setText(err.strerror.decode("utf-8"))
            self.ui.Clog_textEdit.setText(err.strerror.decode("utf-8"))

if __name__ == "__main__":
  import sys
  app = QtGui.QApplication(sys.argv)
  s = imiserv()
  s.show()
  sys.exit(app.exec_())