Question

我用pyqt4和python3.3中的线程编写一个简单的套接字应用程序，但我在运行Qt classes命令时遇到问题，比如在标签或任何事情中显示消息，只有python代码正常工作。

在我的gui中没有向S_label显示任何内容，

我使用2种方法在S_label上显示任何消息，但两种方式都不起作用，

self._ui
self.ui

代码：

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

对于print这两种方式都很有效：

打印（self._ui）
打印（self.ui）

print输出：

- <imigui.Ui_MainWindow object at 0x7fe0746cac10>

- <imigui.Ui_MainWindow object at 0x7fe0746d5d90>

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）：

我的方式遇到了一个新问题：我在我的gui中添加了一个qtextedit，当我想在我的代码Segmentation fault中设置文本时，发生了应用程序崩溃，

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 来自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.write_msg)

def write_msg(self, lbl_msg= None, txt_msg= None):
    if lbl_msg:
        self.ui.C_label.setText(lbl_msg)
    if txt_msg:
        self.ui.Clog_textEdit.setText(txt_msg)

def serv(self):
    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.clis.accept()
                clirecmsg= str(cliconn.recv(1024)
                self._parent.send_msg.emit("{0}:{1} is connected.".format(addr, remoport), "{0}:{1}".format(addr, remoport)
                cliconn.close()

            MY_LOCK.release()

    try :
        self.clis= socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.clis.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        clierhost= str(self.ui.Sip_lineEdit.text())
        clierport= int(self.ui.Sport_lineEdit.text())
        self.clis.bind((clierhost, clierport))
        self.clis.listen(5)
        a= CountT(self)
        a.daemon= True
        a.start()
    except socket.error as err:
        err= str(err)
        print(err)

这是发生交错的错误，我应该按两次按钮获取第一次获取事件错误在linux中显示并且没有任何内容在Windows和第二次按下事件发生，（此错误仅在linux操作系统中显示。）

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

Answer 1

以下代码适用于我（Python 2.6）。我使用CountT删除了imiserv的继承，并将~~替换为{del> QLabel S_label~~ imiserv实例。 pyqtsignal允许线程CounT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_())

不显示任何来自setText（）或线程类内部pyqt4中的其他显示方法的内容

1 个答案: