PyQt4如何通过单击pushButton来使用多处理

Question

我一直在尝试使用多进程运行命令，因为在使用while循环时GUI冻结。我需要调用pyqt4类中的函数。或者更好的方式来处理多进程将Qthread帮助我？我搜索了很多教程，但我无法弄清楚我该如何做到这一点。

我试过这样，它工作正常。问题是我不能得到传递给函数的QeditText的输入，如果有一种方法，我可以然后它会为我想要做的。

import sys 
import multiprocessing 
import time 
from PyQt4 import QtCore, QtGui 
from form import Ui_Dialog 


def worker(): 
    t = MyDialog() 
    name = multiprocessing.current_process().name 
    print name, 'Starting', t.self.ui.rtmpIN.toPlainText() 
    time.sleep(2) 
    print name, 'Exiting' 

class MyDialog(QtGui.QDialog): 
    def __init__(self, parent=None): 
     QtGui.QWidget.__init__(self, parent) 
     self.ui = Ui_Dialog() 
     self.ui.setupUi(self) 
     self.ui.startButton.clicked.connect(self.start) 
     self.ui.stopButton.clicked.connect(self.stop) 
     self.ui.comboBox.addItem("player 1") 
     self.ui.comboBox.addItem("player 2") 
     self.ui.comboBox.addItem("player 3") 
     #self.ui.comboBox.currentIndexChanged.connect(self.selectionchange) 

    def selectionchange(self,i): 
     print self.ui.comboBox.currentText() 

    def start(self): 
     worker_2 = multiprocessing.Process(target=worker) # use default name 
     worker_2.start() 
     print "in: ", self.ui.rtmpIN.toPlainText() 
     print "out: ", self.ui.outPUT.toPlainText() 
     print str(self.ui.comboBox.currentText()) 

     if self.ui.quialityBox.isChecked(): 
      q = "Streaming started" + "\n" + "quality: " + self.ui.Setquality.toPlainText() + "\n" + "player: " + str(self.ui.comboBox.currentText()) 
      self.ui.theLog.append(q) 
      #print self.ui.Setquality.toPlainText() 
     else: 
      p = "Streaming" + "\n" + "player: " + str(self.ui.comboBox.currentText()) + "\n" 
      self.ui.theLog.append(p) 

    def stop(self): 
     print 'stop pressed.' 
     self.close() 




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

我需要能够从工作人员功能中获取数据，有没有办法？

print "in: ", self.ui.rtmpIN.toPlainText() 
print "out: ", self.ui.outPUT.toPlainText() 

编辑：这里忘了form.py是 http://pastebin.com/HksuSjkt

Answer 1

这是我的解决方案：

from PyQt4.QtCore import QThread 

class Worker(QThread): 
    def __init__(self, parent=None): 
     super(Worker, self).__init__(parent) 
     self.textin = "" 
     self.textout = "" 
     self.okay = True 

    def setTextIn(self, text): 
     self.textin = text 

    def setTextOut(self, text): 
     self.textout = text 

    def run(self): 
     while self.okay: 
      print('IN:' + self.textin) 
      print('OUT:' + self.textout) 
      time.sleep(2) 

    def stop(self): 
     self.okay = False 


class MyDialog(QtGui.QDialog): 
    def __init__(self, parent=None): 
     QtGui.QWidget.__init__(self, parent) 
     self.worker = Worker(self) 
     self.ui = Ui_Dialog() 
     self.ui.setupUi(self) 
     self.ui.rtmpIN.textChanged.connect(self.changeText) 
     self.ui.outPUT.textChanged.connect(self.changeText) 
     self.ui.startButton.clicked.connect(self.start) 
     self.ui.stopButton.clicked.connect(self.stop) 
     self.ui.comboBox.addItem("player 1") 
     self.ui.comboBox.addItem("player 2") 
     self.ui.comboBox.addItem("player 3") 

    def selectionchange(self,i): 
     print(self.ui.comboBox.currentText()) 

    def start(self): 
     self.worker.start() 
     print("in: "+self.ui.rtmpIN.toPlainText()) 
     print("out: "+self.ui.outPUT.toPlainText()) 
     print(self.ui.comboBox.currentText()) 

     if self.ui.quialityBox.isChecked(): 
      q = "Streaming started" + "\n" + "quality: " + self.ui.Setquality.toPlainText() + "\n" + "player: " + str(self.ui.comboBox.currentText()) 
      self.ui.theLog.append(q) 
     else: 
      p = "Streaming" + "\n" + "player: " + str(self.ui.comboBox.currentText()) + "\n" 
      self.ui.theLog.append(p) 

    def changeText(self): 
     self.worker.setTextIn(self.ui.rtmpIN.toPlainText()) 
     self.worker.setTextOut(self.ui.outPUT.toPlainText()) 

    def stop(self): 
     self.worker.stop() 
     self.worker.quit() 
     self.worker.wait() 
     print('stop pressed.') 
     self.close() 

    def closeEvent(self, event): 
     self.worker.stop() 
     self.worker.quit() 
     self.worker.wait() 
     QtGui.QDialog.closeEvent(self, event) 


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

输出：

Answer 2

我不是一个在PyQt的专家，但我认为你把一个条目部件中提到您form.py eyllanesc，我可以看到你导入。

你使用特殊变量来包含UI等字符串的原因之一是它驻留的类占用了一个指定的内存空间（当涉及到范围等时）。

当涉及到多处理时，内存空间不再共享，您无法再访问此变量。如果你使用multiTHREADING，它是一个新的线程，但在同一个进程中，这意味着它可以访问你想要的Qt字符串。

的语法是为了这个目的相同

import threading 

def foo(): pass 

t = threading.Thread(target=foo, 
        args=[]) 

t.daemon = True 

t.start() 

了解更多关于线程here