作为Python中GUI开发的新手(使用pygtk),我刚刚开始学习线程。为了测试我的技能,我用启动/停止按钮编写了一个简单的GTK界面。目标是,当它被点击时,一个线程开始快速地在文本框中增加一个数字,同时保持图形用户界面的响应。

我让GUI工作得很好,但是线程有问题。这可能是一个简单的问题,但我的思想是油炸一天。下面我先粘贴了来自Python解释器的引用通告,然后是代码。你可以去

http://drop.io/pxgr5id

下载。我正在使用BZR进行修订控制,因此如果您想进行修改并重新删除它,请提交更改。我也在粘贴代码

http://dpaste.com/113388/

因为它可以有行号,而这个降价的东西让我头疼。

回溯

crashsystems@crashsystems-laptop:~/Desktop/thread-gui$ python threadgui.pybtnStartStop clicked

Traceback (most recent call last):

File "threadgui.py", line 39, in on_btnStartStop_clicked

self.thread.stop()

File "threadgui.py", line 20, in stop

self.join()

File "/usr/lib/python2.5/threading.py", line 583, in join

raise RuntimeError("cannot join thread before it is started")

RuntimeError: cannot join thread before it is started

btnStartStop clicked

threadStop = 1

btnStartStop clicked

threadStop = 0

btnStartStop clicked

Traceback (most recent call last):

File "threadgui.py", line 36, in on_btnStartStop_clicked

self.thread.start()

File "/usr/lib/python2.5/threading.py", line 434, in start

raise RuntimeError("thread already started")

RuntimeError: thread already started

btnExit clicked

exit() called

代码

#!/usr/bin/bash

import gtk, threading

class ThreadLooper (threading.Thread):

def __init__ (self, sleep_interval, function, args=[], kwargs={}):

threading.Thread.__init__(self)

self.sleep_interval = sleep_interval

self.function = function

self.args = args

self.kwargs = kwargs

self.finished = threading.Event()

def stop (self):

self.finished.set()

self.join()

def run (self):

while not self.finished.isSet():

self.finished.wait(self.sleep_interval)

self.function(*self.args, **self.kwargs)

class ThreadGUI:

# Define signals

def on_btnStartStop_clicked(self, widget, data=None):

print "btnStartStop clicked"

if(self.threadStop == 0):

self.threadStop = 1

self.thread.start()

else:

self.threadStop = 0

self.thread.stop()

print "threadStop = " + str(self.threadStop)

def on_btnMessageBox_clicked(self, widget, data=None):

print "btnMessageBox clicked"

self.lblMessage.set_text("This is a message!")

self.msgBox.show()

def on_btnExit_clicked(self, widget, data=None):

print "btnExit clicked"

self.exit()

def on_btnOk_clicked(self, widget, data=None):

print "btnOk clicked"

self.msgBox.hide()

def on_mainWindow_destroy(self, widget, data=None):

print "mainWindow destroyed!"

self.exit()

def exit(self):

print "exit() called"

self.threadStop = 1

gtk.main_quit()

def threadLoop(self):

# This will run in a thread

self.txtThreadView.set_text(str(self.threadCount))

print "hello world"

self.threadCount += 1

def __init__(self):

# Connect to the xml GUI file

builder = gtk.Builder()

builder.add_from_file("threadgui.xml")

# Connect to GUI widgets

self.mainWindow = builder.get_object("mainWindow")

self.txtThreadView = builder.get_object("txtThreadView")

self.btnStartStop = builder.get_object("btnStartStop")

self.msgBox = builder.get_object("msgBox")

self.btnMessageBox = builder.get_object("btnMessageBox")

self.btnExit = builder.get_object("btnExit")

self.lblMessage = builder.get_object("lblMessage")

self.btnOk = builder.get_object("btnOk")

# Connect the signals

builder.connect_signals(self)

# This global will be used for signaling the thread to stop.

self.threadStop = 1

# The thread

self.thread = ThreadLooper(0.1, self.threadLoop, (1,0,-1))

self.threadCounter = 0

if __name__ == "__main__":

# Start GUI instance

GUI = ThreadGUI()

GUI.mainWindow.show()

gtk.main()