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

1. # -*- coding: utf-8 -*-
3. # Form implementation generated from reading ui file 'F:\workspace\pyqt5\gui_thread_pipe_subprocess\qt_main.ui'
4. #
5. # Created by: PyQt4 UI code generator 4.11.4
6. #
7. # WARNING! All changes made in this file will be lost!
9. from PyQt4 import QtCore, QtGui
11. try:
12. _fromUtf8 = QtCore.QString.fromUtf8
13. except AttributeError:
14. def _fromUtf8(s):
15. return s
17. try:
18. _encoding = QtGui.QApplication.UnicodeUTF8
19. def _translate(context, text, disambig):
20. return QtGui.QApplication.translate(context, text, disambig, _encoding)
21. except AttributeError:
22. def _translate(context, text, disambig):
23. return QtGui.QApplication.translate(context, text, disambig)
25. class Ui_MainWindow(object):
26. def setupUi(self, MainWindow):
27. MainWindow.setObjectName(_fromUtf8("MainWindow"))
28. MainWindow.resize(800, 600)
29. self.centralwidget = QtGui.QWidget(MainWindow)
30. self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
31. self.verticalLayout = QtGui.QVBoxLayout(self.centralwidget)
32. self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
33. self.textEdit = QtGui.QTextEdit(self.centralwidget)
34. self.textEdit.setObjectName(_fromUtf8("textEdit"))
35. self.verticalLayout.addWidget(self.textEdit)
36. self.horizontalLayout = QtGui.QHBoxLayout()
37. self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
38. spacerItem = QtGui.QSpacerItem(40, 20, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Minimum)
39. self.horizontalLayout.addItem(spacerItem)
40. self.pushButton = QtGui.QPushButton(self.centralwidget)
41. self.pushButton.setObjectName(_fromUtf8("pushButton"))
42. self.horizontalLayout.addWidget(self.pushButton)
43. spacerItem1 = QtGui.QSpacerItem(40, 20, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Minimum)
44. self.horizontalLayout.addItem(spacerItem1)
45. self.verticalLayout.addLayout(self.horizontalLayout)
46. MainWindow.setCentralWidget(self.centralwidget)
47. self.menubar = QtGui.QMenuBar(MainWindow)
48. self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
49. self.menubar.setObjectName(_fromUtf8("menubar"))
50. MainWindow.setMenuBar(self.menubar)
51. self.statusbar = QtGui.QStatusBar(MainWindow)
52. self.statusbar.setObjectName(_fromUtf8("statusbar"))
53. MainWindow.setStatusBar(self.statusbar)
55. self.retranslateUi(MainWindow)
56. QtCore.QMetaObject.connectSlotsByName(MainWindow)
58. def retranslateUi(self, MainWindow):
59. MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
60. self.pushButton.setText(_translate("MainWindow", "star", None))
63. if __name__ == "__main__":
64. import sys
65. app = QtGui.QApplication(sys.argv)
66. MainWindow = QtGui.QMainWindow()
67. ui = Ui_MainWindow()
68. ui.setupUi(MainWindow)
69. MainWindow.show()
70. sys.exit(app.exec_())

mainWindow.py

1. #-*- coding: utf-8 -*-
3. #mainWindow.py
5. from PyQt4 import QtCore, QtGui
6. from Ui_qt_main import Ui_MainWindow
7. from handleSubprocess import HandleSubProcess
8. import multiprocessing, threading
11. class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
12. def __init__(self):
13. super(MainWindow, self).__init__()
14. self.setupUi(self)
15. #联动按键
16. self.btnStar = "star"
17. self.btnStop = "stop"
18. self.connect(self.pushButton, QtCore.SIGNAL("clicked()"), self.buttonOn)
19. pass
21. def buttonOn(self):
22. if self.btnStar == self.pushButton.text():
23. self.pushButton.setText(self.btnStop)
24. self.starRun()
25. pass
26. elif self.btnStop == self.pushButton.text():
27. self.stopRun()
28. self.pushButton.setText(self.btnStar)
29. pass
30. pass
32. def stopRun(self):
33. print "stopRun"
34. if self.p.is_alive():
35. self.p.terminate()
36. self.t1.join(1)
37. pass
38. pass
40. def starRun(self):
41. #print "starRun"
42. parent_conn, child_conn = multiprocessing.Pipe()
43. #子进程
44. self.p = HandleSubProcess(child_conn)
45. self.t1 = threading.Thread(target=self.run_thread, args=(parent_conn,self.p))
46. self.p.start()
47. self.t1.start()
48. pass
50. def run_thread(self, parent_conn, pp):
51. while pp.is_alive:
52. self.textEdit.append(parent_conn.recv())
53. self.delay()
54. pass
55. print "==== run_thread end ==================\n"
56. pass
58. def delay(self, timeout=9999999):
59. cnt = timeout
60. while cnt>0:
61. cnt -= 1
62. pass
63. pass
64. pass

handleSubprocess.py

1. #-*- coding: utf-8 -*-
3. #handleSubprocess.py
5. import multiprocessing
7. class HandleSubProcess(multiprocessing.Process):
8. def __init__(self, child_conn):
9. super(HandleSubProcess, self).__init__()
10. self.child_conn = child_conn
11. pass
13. def run(self):
14. cnt = 0
15. while True:
16. self.child_conn.send("handleSubprocess\t"+str(cnt))
17. cnt += 1
18. self.delay()
19. pass
20. pass
22. def delay(self, timeout=9999999):
23. cnt = timeout
24. while cnt>0:
25. cnt -= 1
26. pass
27. pass
28. pass

enterPoint.py

1. #-*- coding: utf-8 -*-
3. #enterPoint.py
5. import sys
6. from PyQt4 import QtCore, QtGui
7. from mainWindow import MainWindow
11. if __name__ == "__main__":
13. app = QtGui.QApplication(sys.argv)
14. ui = MainWindow()
15. ui.show()
16. sys.exit(app.exec_())

以此与同道中人共勉。

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转载于:https://www.cnblogs.com/naedzq/p/6127449.html