爲pyqt4行返回的空白值

我很抱歉，如果這是一個簡單/愚蠢的錯誤或已經被回答，我很新的編程和我正在教育自己。這是我在stackoverflow中的第一個問題，所以請讓我知道如果你需要進一步的信息或我的問題不清楚。爲pyqt4行返回的空白值

我的代碼無法檢索到我在我的lineEdit字段中輸入的IP地址。在函數「readip」中，我試圖獲取lineEdit的值，但我從來沒有得到我輸入的值。我試過ip = str（gui.lineEdit.text（））和ip = str（gui.lineEdit.text）。 ip = str（gui.lineEdit.text）爲我提供了對象的內存插槽，但不是IP地址。

我從我的應用程序附加代碼。請告訴我，我做錯了什麼

這是我的主要用途：

import Gui 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
import PyQt4 
import subprocess 
import time 
import os 
import sys 
from threading import Thread 



class Gui(QDialog,Gui.Ui_mGui): 
    def __init__(self,parent=None): 
     global ip 

     super(Gui,self).__init__(parent) 
     self.setupUi(self) 

     self.connect(self.instructionButton, SIGNAL("clicked()"), self.showInstructions) 
     Gui.connect(self.serviceButton, SIGNAL("clicked()"), backendServiceClass) 
     self.checkBox.stateChanged.connect(self.autostartService) 


     if self.checkBox.isChecked(): 

      print "The AutoStartService Button was checked" 
      #backendService() 

     else: 
      print "The AutoStartService Button was not checked" 




    def readip(self): 
     global ip 
     gui=Gui() 
     ip=str(gui.lineEdit.text()) 
     print ip 
     time.sleep(1) 
     print"test" 
     print ip 
     time.sleep(20) 



    def showInstructions(self): 
     QMessageBox.information(self,"Instructions","Enter the IP address of a mobile device you carry with you always.The Application would check whether it can reach that device using your wireless network. If the device is unreachable, it would put the computer to sleep!") 

    def autostartService(self): 
     if self.checkBox.isChecked(): 
      autoStartService=1 
      TrackAutoStartService = open("AutoStartService", "w+") 
      TrackAutoStartService.write(str(autoStartService)) 
      TrackAutoStartService.close 
      print "Autostart Service Checked" 
      print autoStartService 
     else: 
      autoStartService = 0 
      TrackAutoStartService = open("AutoStartService", "w+") 
      TrackAutoStartService.write(str(autoStartService)) 
      TrackAutoStartService.close 
      print "Autostart Service Unchecked" 
      print autoStartService 

class backendServiceClass(Thread,Gui): 
    def __init__(self,parent=None): 
     Thread.__init__(self) 
     self.daemon = True 
     self.start() 

    def run(Gui): 
     global loop 
     global ip 


     Gui.readip() 


     print ip 

     print ip 

     TrackIP = open("TrackIP", "w+") 
     TrackIP.write(ip) 
     TrackIP.close 
     if loop==1: 
      loop=0 
      #Gui.serviceButton.setText("Start Service") 
     else: 
      loop=1 
      #Gui.serviceButton.setText("Stop Service") 

     print("ping -n 1 -w 1000 " + ip) 
     down = 0 





     while loop==1: 
      try: 
       response = subprocess.check_output(
        ['ping', '-n', '1', '-w', '2000', ip], 
        stderr=subprocess.STDOUT, # get all output 
        universal_newlines=True, # return string not bytes 
        shell=True, 
        creationflags=subprocess.SW_HIDE 
       ) 
      except subprocess.CalledProcessError: 
       response = None 

      if (response != None): 
       down = 0 
       time.sleep(1) 
       print ("The host" + ip + " is Alive!") 

      else: 
       down = down + 1 
       time.sleep(1) 
       print (down) 
       if (down == 10): 
        print ("a total of " + str(down) + "pings has been lost") 
        down = 0 
        time.sleep(10) 
        os.system("shutdown -h") 




global loop 
loop=0 
app=QApplication(sys.argv) 
form=Gui() 
form.show() 




app.exec_()

下面是Gui.py

# -*- coding: utf-8 -*- 

# Form implementation generated from reading ui file 'Gui.ui' 
# 
# Created by: PyQt4 UI code generator 4.11.4 
# 
# WARNING! All changes made in this file will be lost! 

from PyQt4 import QtCore, QtGui 

try: 
    _fromUtf8 = QtCore.QString.fromUtf8 
except AttributeError: 
    def _fromUtf8(s): 
     return s 

try: 
    _encoding = QtGui.QApplication.UnicodeUTF8 
    def _translate(context, text, disambig): 
     return QtGui.QApplication.translate(context, text, disambig, _encoding) 
except AttributeError: 
    def _translate(context, text, disambig): 
     return QtGui.QApplication.translate(context, text, disambig) 

class Ui_mGui(object): 
    def setupUi(self, mGui): 
     mGui.setObjectName(_fromUtf8("mGui")) 
     mGui.resize(246, 308) 
     mGui.setMinimumSize(QtCore.QSize(246, 308)) 
     mGui.setMaximumSize(QtCore.QSize(246, 309)) 
     icon = QtGui.QIcon() 
     icon.addPixmap(QtGui.QPixmap(_fromUtf8(":/image/logo.png")), QtGui.QIcon.Normal, QtGui.QIcon.Off) 
     mGui.setWindowIcon(icon) 
     self.checkBox = QtGui.QCheckBox(mGui) 
     self.checkBox.setGeometry(QtCore.QRect(20, 140, 201, 20)) 
     f = open("AutoStartService", "r+") 
     AutoStartService = int(f.read()) 
     if AutoStartService == 1: 
      self.checkBox.setChecked(True) 
     else: 
      self.checkBox.setChecked(False) 
     self.checkBox.setObjectName(_fromUtf8("checkBox")) 
     self.SleeperLabel = QtGui.QLabel(mGui) 
     self.SleeperLabel.setGeometry(QtCore.QRect(90, 10, 131, 51)) 
     font = QtGui.QFont() 
     font.setFamily(_fromUtf8("Harlow Solid Italic")) 
     font.setPointSize(28) 
     font.setBold(False) 
     font.setItalic(True) 
     font.setWeight(50) 
     self.SleeperLabel.setFont(font) 
     self.SleeperLabel.setObjectName(_fromUtf8("SleeperLabel")) 
     self.SleeperLabel_2 = QtGui.QLabel(mGui) 
     self.SleeperLabel_2.setGeometry(QtCore.QRect(10, 10, 71, 61)) 
     font = QtGui.QFont() 
     font.setFamily(_fromUtf8("Harlow Solid Italic")) 
     font.setPointSize(28) 
     font.setBold(False) 
     font.setItalic(True) 
     font.setWeight(50) 
     self.SleeperLabel_2.setFont(font) 
     self.SleeperLabel_2.setText(_fromUtf8("")) 
     self.SleeperLabel_2.setPixmap(QtGui.QPixmap(_fromUtf8(":/image/logo64x64.png"))) 
     self.SleeperLabel_2.setObjectName(_fromUtf8("SleeperLabel_2")) 
     self.serviceButton = QtGui.QPushButton(mGui) 
     self.serviceButton.setGeometry(QtCore.QRect(10, 260, 101, 31)) 
     self.serviceButton.setObjectName(_fromUtf8("serviceButton")) 
     self.instructionButton = QtGui.QPushButton(mGui) 
     self.instructionButton.setGeometry(QtCore.QRect(130, 260, 101, 31)) 
     self.instructionButton.setObjectName(_fromUtf8("instructionButton")) 
     self.label = QtGui.QLabel(mGui) 
     self.label.setGeometry(QtCore.QRect(20, 210, 151, 16)) 
     self.label.setObjectName(_fromUtf8("label")) 
     self.label_2 = QtGui.QLabel(mGui) 
     self.label_2.setGeometry(QtCore.QRect(20, 80, 171, 16)) 
     self.label_2.setObjectName(_fromUtf8("label_2")) 
     self.checkBox_2 = QtGui.QCheckBox(mGui) 
     self.checkBox_2.setGeometry(QtCore.QRect(20, 160, 221, 20)) 
     self.checkBox_2.setObjectName(_fromUtf8("checkBox_2")) 
     self.label_3 = QtGui.QLabel(mGui) 
     self.label_3.setGeometry(QtCore.QRect(20, 190, 151, 16)) 
     self.label_3.setObjectName(_fromUtf8("label_3")) 
     self.lineEdit = QtGui.QLineEdit(mGui) 
     self.lineEdit.setGeometry(QtCore.QRect(20, 98, 181, 31)) 
     self.lineEdit.setObjectName(_fromUtf8("lineEdit")) 

     self.retranslateUi(mGui) 
     QtCore.QMetaObject.connectSlotsByName(mGui) 

    def retranslateUi(self, mGui): 
     mGui.setWindowTitle(_translate("mGui", "Sleeper V3.0", None)) 
     self.checkBox.setText(_translate("mGui", "Autostart Service at Application start", None)) 
     self.SleeperLabel.setText(_translate("mGui", "Sleeper", None)) 
     self.serviceButton.setText(_translate("mGui", "Start Service", None)) 
     self.instructionButton.setText(_translate("mGui", "Instructions", None)) 
     self.label.setText(_translate("mGui", "Currently Tracking the device :", None)) 
     self.label_2.setText(_translate("mGui", "IP Address of your Mobile Device", None)) 
     self.checkBox_2.setText(_translate("mGui", "Autostart Application at System Startup", None)) 
     self.label_3.setText(_translate("mGui", "Service Status :", None)) 
     f1 = open("TrackIP", "r+") 
     IP = str(f1.read()) 
     if IP != "": 
      self.lineEdit.setText(_translate("mGui", IP, None)) 
     self.lineEdit.setPlaceholderText(_translate("mGui", "Mobile IP", None)) 

import xz_rc 

if __name__ == "__main__": 
    import sys 



    app = QtGui.QApplication(sys.argv) 
    mGui = QtGui.QWidget() 
    ui = Ui_mGui() 
    ui.setupUi(mGui) 
    mGui.show() 
    sys.exit(app.exec_())

請讓我知道如果你需要更多信息

來源

2017-02-28 Vishnu Anilkumar

在'readip（）'，也沒有必要建立一個新的'Gui'實例。使用'self'：'self.lineEdit.text（）' – Crispin

嗯，說實話，你的代碼有很多缺陷。你的問題來自它。

global loop

您不必使用全局變量。你可以通過構造函數將它們傳遞給類，並保存爲實例變量。

Gui.connect(self.serviceButton, SIGNAL("clicked()"), backendServiceClass)

而是點擊你最好在桂構造函數創建並啓動它的點擊創建和啓動的對象。

# Gui init self.service = backendServiceClass(parent=self) ... self.serviceButton.clicked.connect(self.service.start)

class backendServiceClass(Thread, Gui):

不要從桂繼承。

class backendServiceClass(Thread, Gui): ... def run(Gui): .... Gui.readip()

這是你的問題。儘管將self變量重命名爲Gui，但它仍指向backendServiceClass實例。而且，因爲你從Gui類繼承，它有lineEdit對象。但是這與你改變的lineEdit不一樣。

UPDATE：

我修改你的代碼一點點，所以這裏是一個工作代碼：

桂。PY

# -*- coding: utf-8 -*- 

# Form implementation generated from reading ui file 'Gui.ui' 
# 
# Created by: PyQt4 UI code generator 4.11.4 
# 
# WARNING! All changes made in this file will be lost! 

from PyQt4 import QtCore, QtGui 

try: 
    _fromUtf8 = QtCore.QString.fromUtf8 
except AttributeError: 
    def _fromUtf8(s): 
     return s 

try: 
    _encoding = QtGui.QApplication.UnicodeUTF8 


    def _translate(context, text, disambig): 
     return QtGui.QApplication.translate(context, text, disambig, _encoding) 
except AttributeError: 
    def _translate(context, text, disambig): 
     return QtGui.QApplication.translate(context, text, disambig) 


class Ui_mGui(object): 
    def setupUi(self, mGui): 
     mGui.setObjectName(_fromUtf8("mGui")) 
     mGui.resize(246, 308) 
     mGui.setMinimumSize(QtCore.QSize(246, 308)) 
     mGui.setMaximumSize(QtCore.QSize(246, 309)) 
     icon = QtGui.QIcon() 
     icon.addPixmap(QtGui.QPixmap(_fromUtf8(":/image/logo.png")), 
         QtGui.QIcon.Normal, QtGui.QIcon.Off) 
     mGui.setWindowIcon(icon) 
     self.checkBox = QtGui.QCheckBox(mGui) 
     self.checkBox.setGeometry(QtCore.QRect(20, 140, 201, 20)) 
     self.checkBox.setObjectName(_fromUtf8("checkBox")) 
     self.SleeperLabel = QtGui.QLabel(mGui) 
     self.SleeperLabel.setGeometry(QtCore.QRect(90, 10, 131, 51)) 
     font = QtGui.QFont() 
     font.setFamily(_fromUtf8("Harlow Solid Italic")) 
     font.setPointSize(28) 
     font.setBold(False) 
     font.setItalic(True) 
     font.setWeight(50) 
     self.SleeperLabel.setFont(font) 
     self.SleeperLabel.setObjectName(_fromUtf8("SleeperLabel")) 
     self.SleeperLabel_2 = QtGui.QLabel(mGui) 
     self.SleeperLabel_2.setGeometry(QtCore.QRect(10, 10, 71, 61)) 
     font = QtGui.QFont() 
     font.setFamily(_fromUtf8("Harlow Solid Italic")) 
     font.setPointSize(28) 
     font.setBold(False) 
     font.setItalic(True) 
     font.setWeight(50) 
     self.SleeperLabel_2.setFont(font) 
     self.SleeperLabel_2.setText(_fromUtf8("")) 
     self.SleeperLabel_2.setPixmap(
      QtGui.QPixmap(_fromUtf8(":/image/logo64x64.png"))) 
     self.SleeperLabel_2.setObjectName(_fromUtf8("SleeperLabel_2")) 
     self.serviceButton = QtGui.QPushButton(mGui) 
     self.serviceButton.setGeometry(QtCore.QRect(10, 260, 101, 31)) 
     self.serviceButton.setObjectName(_fromUtf8("serviceButton")) 
     self.instructionButton = QtGui.QPushButton(mGui) 
     self.instructionButton.setGeometry(QtCore.QRect(130, 260, 101, 31)) 
     self.instructionButton.setObjectName(_fromUtf8("instructionButton")) 
     self.label = QtGui.QLabel(mGui) 
     self.label.setGeometry(QtCore.QRect(20, 210, 151, 16)) 
     self.label.setObjectName(_fromUtf8("label")) 
     self.label_2 = QtGui.QLabel(mGui) 
     self.label_2.setGeometry(QtCore.QRect(20, 80, 171, 16)) 
     self.label_2.setObjectName(_fromUtf8("label_2")) 
     self.checkBox_2 = QtGui.QCheckBox(mGui) 
     self.checkBox_2.setGeometry(QtCore.QRect(20, 160, 221, 20)) 
     self.checkBox_2.setObjectName(_fromUtf8("checkBox_2")) 
     self.label_3 = QtGui.QLabel(mGui) 
     self.label_3.setGeometry(QtCore.QRect(20, 190, 151, 16)) 
     self.label_3.setObjectName(_fromUtf8("label_3")) 
     self.lineEdit = QtGui.QLineEdit(mGui) 
     self.lineEdit.setGeometry(QtCore.QRect(20, 98, 181, 31)) 
     self.lineEdit.setObjectName(_fromUtf8("lineEdit")) 

     self.retranslateUi(mGui) 
     QtCore.QMetaObject.connectSlotsByName(mGui) 

    def retranslateUi(self, mGui): 
     mGui.setWindowTitle(_translate("mGui", "Sleeper V3.0", None)) 
     self.checkBox.setText(
      _translate("mGui", "Autostart Service at Application start", None)) 
     self.SleeperLabel.setText(_translate("mGui", "Sleeper", None)) 
     self.serviceButton.setText(_translate("mGui", "Start Service", None)) 
     self.instructionButton.setText(
      _translate("mGui", "Instructions", None)) 
     self.label.setText(
      _translate("mGui", "Currently Tracking the device :", None)) 
     self.label_2.setText(
      _translate("mGui", "IP Address of your Mobile Device", None)) 
     self.checkBox_2.setText(
      _translate("mGui", "Autostart Application at System Startup", 
         None)) 
     self.label_3.setText(_translate("mGui", "Service Status :", None)) 
     self.lineEdit.setPlaceholderText(_translate("mGui", "Mobile IP", None))

主要應用

import subprocess 
import time 
import os 
import sys 

from PyQt4.QtCore import * 
from PyQt4.QtGui import * 

from Gui import Ui_mGui 


class Gui(QDialog, Ui_mGui): 
    def __init__(self, parent=None): 
     super(Gui, self).__init__(parent) 
     self.setupUi(self) 

     f = open("AutoStartService", "r+") 
     AutoStartService = int(f.read()) 
     if AutoStartService == 1: 
      self.checkBox.setChecked(True) 
     else: 
      self.checkBox.setChecked(False) 
     f.close() 

     f = open("TrackIP", "r+") 
     IP = str(f.read()) 
     if IP != "": 
      self.lineEdit.setText(IP) 
     f.close() 

     self.service = backendServiceClass(parent=self) 

     self.connect(self.instructionButton, SIGNAL("clicked()"), 
        self.showInstructions) 
     Gui.connect(self.serviceButton, SIGNAL("clicked()"), 
        lambda: self.service.toggle_service(self.lineEdit.text())) 
     self.checkBox.stateChanged.connect(self.autostartService) 

     if self.checkBox.isChecked(): 
      print "The AutoStartService Button was checked" 
      # backendService() 
     else: 
      print "The AutoStartService Button was not checked" 

    def showInstructions(self): 
     QMessageBox.information(self, "Instructions", 
           "Enter the IP address of a mobile device you carry with you always.The Application would check whether it can reach that device using your wireless network. If the device is unreachable, it would put the computer to sleep!") 

    def autostartService(self): 
     if self.checkBox.isChecked(): 
      autoStartService = 1 
      print "Autostart Service Checked" 
     else: 
      autoStartService = 0 
      print "Autostart Service Unchecked" 
     print autoStartService 

     TrackAutoStartService = open("AutoStartService", "w+") 
     TrackAutoStartService.write(str(autoStartService)) 
     TrackAutoStartService.close() 


class backendServiceClass(QThread): 
    def __init__(self, parent=None): 
     QThread.__init__(self, parent) 
     self.daemon = True 
     self.ip = None 

    def toggle_service(self, ip): 
     if self.isRunning(): 
      self.terminate() 
      self.parent().serviceButton.setText("Start Service") 
     else: 
      self.parent().serviceButton.setText("Stop Service") 
      self.ip = str(ip) 
      self.start() 

    def run(self): 
     TrackIP = open("TrackIP", "w+") 
     TrackIP.write(self.ip) 
     TrackIP.close() 
     print("ping -n 1 -w 1000 " + self.ip) 
     down = 0 

     while 1: 
      try: 
       response = subprocess.check_output(
        ['ping', '-n', '1', '-w', '2000', self.ip], 
        stderr=subprocess.STDOUT, # get all output 
        universal_newlines=True, # return string not bytes 
        shell=True, 
        creationflags=subprocess.SW_HIDE 
       ) 
      except subprocess.CalledProcessError: 
       response = None 

      if (response != None): 
       down = 0 
       time.sleep(1) 
       print ("The host" + self.ip + " is Alive!") 

      else: 
       down = down + 1 
       time.sleep(1) 
       print (down) 
       if (down == 10): 
        print ("a total of " + str(down) + "pings has been lost") 
        down = 0 
        time.sleep(10) 
        os.system("shutdown -h") 


app = QApplication(sys.argv) 
form = Gui() 
form.show() 
app.exec_()

來源

2017-02-28 11:47:43 mFoxRU

爲pyqt4行返回的空白值

回答

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