TopicSpace: PyQt4, QThread example

TopicSpace: PyQt4, QThread example

Title: PyQt4, QThread example

Last Modified: 10.16.2008

This is about the most simple example I could think of how to make a thread

#!/usr/bin/env python
"""This is a short program to have an external program grab data for me and get displayed without blocking the whole program"""
from PyQt4 import QtGui,QtCore
import sys
class TerminalViewer(QtGui.QWidget):
	def __init__(self,parent=None):
		QtGui.QWidget.__init__(self,parent)
		self.Label = QtGui.QLabel("Waiting for Something",self)
		self.DataCollector = TerminalX(self)
		self.connect(self.DataCollector,QtCore.SIGNAL("Activated ( QString ) "), self.Activated)
		self.DataCollector.start()
	def Activated(self,newtext):
		self.Label.setText(newtext)
	def closeEvent(self,e):
		e.accept()
		app.exit()

class TerminalX(QtCore.QThread):
	def __init__(self,parent=None):
		QtCore.QThread.__init__(self,parent)
		self.test = ''
	def run(self):
		while self.test != 'q':
			self.test = raw_input('enter data: ')
			self.emit(QtCore.SIGNAL("Activated( QString )"),self.test)

app = QtGui.QApplication(sys.argv)
qb = TerminalViewer()
qb.show()
sys.exit(app.exec_())

This starts a QLabel with some text, if you type in the terminal where you started the program then you can change the text on the widget. The "start()" method executes the "run()" method in addition to starting the thread in a separate process.