基于multiprocessing和threading实现非阻塞的GUI界面显示

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环境：python2.7、pyqt4、eric16.11

热点：multiprocessing、threading、GUI、pyqt

需求：

希望界面上的QTextEdit控件可以滚动刷新日志，且软件界面不可以有阻塞。

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最终实现效果如下：

该实现的核心思想是：

先建立一个pipe，write端传给子进程，子进程无限发数据，read端传给子线程，在子进程活动的情况下无限取数据；子线程中再把read到的数据写入QTextEdit控件上。下面贴上详细的代码：

Ui_qt_main.py

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

# Form implementation generated from reading ui file ‘F:\workspace\pyqt5\gui_thread_pipe_subprocess\qt_main.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_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(800, 600)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.verticalLayout = QtGui.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
        self.textEdit = QtGui.QTextEdit(self.centralwidget)
        self.textEdit.setObjectName(_fromUtf8("textEdit"))
        self.verticalLayout.addWidget(self.textEdit)
        self.horizontalLayout = QtGui.QHBoxLayout()
        self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
        spacerItem = QtGui.QSpacerItem(40, 20, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Minimum)
        self.horizontalLayout.addItem(spacerItem)
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.horizontalLayout.addWidget(self.pushButton)
        spacerItem1 = QtGui.QSpacerItem(40, 20, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Minimum)
        self.horizontalLayout.addItem(spacerItem1)
        self.verticalLayout.addLayout(self.horizontalLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)

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

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.pushButton.setText(_translate("MainWindow", "star", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

mainWindow.py

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

#mainWindow.py

from PyQt4 import QtCore, QtGui
from Ui_qt_main import Ui_MainWindow
from handleSubprocess import HandleSubProcess
import multiprocessing, threading


class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setupUi(self)
        #联动按键
        self.btnStar = "star"
        self.btnStop = "stop"
        self.connect(self.pushButton, QtCore.SIGNAL("clicked()"), self.buttonOn)
        pass
    
    def buttonOn(self):
        if self.btnStar == self.pushButton.text():
            self.pushButton.setText(self.btnStop)
            self.starRun()
            pass
        elif self.btnStop == self.pushButton.text():
            self.stopRun()
            self.pushButton.setText(self.btnStar)
            pass
        pass
    
    def stopRun(self):
        print "stopRun"
        if self.p.is_alive():
            self.p.terminate()
            self.t1.join(1)
            pass
        pass
    
    def starRun(self):
        #print "starRun"
        parent_conn, child_conn = multiprocessing.Pipe()
        #子进程
        self.p = HandleSubProcess(child_conn)
        self.t1 = threading.Thread(target=self.run_thread, args=(parent_conn,self.p))
        self.p.start()
        self.t1.start()
        pass
    
    def run_thread(self, parent_conn, pp):
        while pp.is_alive:
            self.textEdit.append(parent_conn.recv())
            self.delay()
            pass
        print "==== run_thread  end ==================\n"
        pass
    
    def delay(self, timeout=9999999):
        cnt = timeout
        while cnt>0:
            cnt -= 1
            pass
        pass
    pass

handleSubprocess.py

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

#handleSubprocess.py

import multiprocessing

class HandleSubProcess(multiprocessing.Process):
    def __init__(self, child_conn):
        super(HandleSubProcess, self).__init__()
        self.child_conn = child_conn
        pass
    
    def run(self):
        cnt = 0
        while True:
            self.child_conn.send("handleSubprocess\t"+str(cnt))
            cnt += 1
            self.delay()
            pass
        pass
    
    def delay(self, timeout=9999999):
        cnt = timeout
        while cnt>0:
            cnt -= 1
            pass
        pass
    pass

enterPoint.py

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

#enterPoint.py

import sys
from PyQt4 import QtCore, QtGui 
from mainWindow import MainWindow



if __name__ == "__main__":
    
    app = QtGui.QApplication(sys.argv)
    ui = MainWindow()
    ui.show()
    sys.exit(app.exec_())

以此与同道中人共勉。

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