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POPango error after a minute of running
 

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    <p>I have the following python modules. Sorry if the code is ugly. This is my first python GUI app and I'm fairly new to python as well. It's some sort of a count down timer with a todo list. It works kinda well except that after two minutes after running the program, it crashes with the following error:</p> <pre><code>Pango:ERROR:/build/buildd/pango1.0-1.28.0/pango/pango-layout.c:3739:pango_layout_check_lines: assertion failed: (!layout-&gt;log_attrs) </code></pre> <p>I have absolutely no idea what that even means. One I'm confused about is that it works after the first minute, ie. the timer label counts down ok but on the next minute, it crashes immediately.</p> <p>After googling a bit, I think the issue might be related to multithreading? Any ideas?</p> <pre><code>#!/usr/bin/env python # -*- coding: utf-8 -*- # generated by wxGlade 0.6.3 on Fri Jul 9 17:00:08 2010 import wx import settimer # begin wxGlade: extracode # end wxGlade class MyFrame(wx.Frame): def __init__(self, *args, **kwds): # begin wxGlade: MyFrame.__init__ kwds["style"] = wx.DEFAULT_FRAME_STYLE wx.Frame.__init__(self, *args, **kwds) self.todo1 = wx.TextCtrl(self, -1, "") self.timer_label1 = wx.StaticText(self, -1, "00:00") self.set_timer1 = wx.Button(self, -1, "Set Timer") self.todo2 = wx.TextCtrl(self, -1, "") self.timer_label2 = wx.StaticText(self, -1, "00:00") self.set_timer2 = wx.Button(self, -1, "Set Timer") self.todo3 = wx.TextCtrl(self, -1, "") self.timer_label3 = wx.StaticText(self, -1, "00:00") self.set_timer3 = wx.Button(self, -1, "Set Timer") self.todo4 = wx.TextCtrl(self, -1, "") self.timer_label4 = wx.StaticText(self, -1, "00:00") self.set_timer4 = wx.Button(self, -1, "Set Timer") self.todo5 = wx.TextCtrl(self, -1, "") self.timer_label5 = wx.StaticText(self, -1, "00:00") self.set_timer5 = wx.Button(self, -1, "Set Timer") self.hours = 0 self.minutes = 0 self.__set_properties() self.__do_layout() self.Bind(wx.EVT_BUTTON, self.on_set1, self.set_timer1) self.Bind(wx.EVT_BUTTON, self.on_set2, self.set_timer2) self.Bind(wx.EVT_BUTTON, self.on_set3, self.set_timer3) self.Bind(wx.EVT_BUTTON, self.on_set4, self.set_timer4) self.Bind(wx.EVT_BUTTON, self.on_set5, self.set_timer5) # end wxGlade def __set_properties(self): # begin wxGlade: MyFrame.__set_properties self.SetTitle("Track Work") self.todo1.SetMinSize((300, 25)) self.timer_label1.SetMinSize((100, 30)) self.timer_label1.SetFont(wx.Font(15, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.set_timer1.SetMinSize((85, 27)) self.todo2.SetMinSize((300, 25)) self.timer_label2.SetMinSize((100, 30)) self.timer_label2.SetFont(wx.Font(15, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.set_timer2.SetMinSize((85, 27)) self.todo3.SetMinSize((300, 25)) self.timer_label3.SetMinSize((100, 30)) self.timer_label3.SetFont(wx.Font(15, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.set_timer3.SetMinSize((85, 27)) self.todo4.SetMinSize((300, 25)) self.timer_label4.SetMinSize((100, 30)) self.timer_label4.SetFont(wx.Font(15, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.set_timer4.SetMinSize((85, 27)) self.todo5.SetMinSize((300, 25)) self.timer_label5.SetMinSize((100, 30)) self.timer_label5.SetFont(wx.Font(15, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.set_timer5.SetMinSize((85, 27)) # end wxGlade def __do_layout(self): # begin wxGlade: MyFrame.__do_layout flex_sizer = wx.FlexGridSizer(5, 3, 2, 25) flex_sizer.Add(self.todo1, 0, 0, 0) flex_sizer.Add(self.timer_label1, 0, 0, 0) flex_sizer.Add(self.set_timer1, 0, 0, 0) flex_sizer.Add(self.todo2, 0, 0, 0) flex_sizer.Add(self.timer_label2, 0, 0, 0) flex_sizer.Add(self.set_timer2, 0, 0, 0) flex_sizer.Add(self.todo3, 0, 0, 0) flex_sizer.Add(self.timer_label3, 0, 0, 0) flex_sizer.Add(self.set_timer3, 0, 0, 0) flex_sizer.Add(self.todo4, 0, 0, 0) flex_sizer.Add(self.timer_label4, 0, 0, 0) flex_sizer.Add(self.set_timer4, 0, 0, 0) flex_sizer.Add(self.todo5, 0, 0, 0) flex_sizer.Add(self.timer_label5, 0, 0, 0) flex_sizer.Add(self.set_timer5, 0, 0, 0) self.SetSizer(flex_sizer) flex_sizer.Fit(self) self.Layout() # end wxGlade def on_set1(self, event): # wxGlade: MyFrame.&lt;event_handler&gt; app = wx.PySimpleApp(0) wx.InitAllImageHandlers() MyTimer = settimer.Timer(None, -1, "") MyTimer.get_out_instance(self) app.SetTopWindow(MyTimer) MyTimer.Show() app.MainLoop() event.Skip() def set_label(self): self.timer_label1.SetLabel("%02d:%02d" % (self.hours, self.minutes)) self.minutes -= 1 # end of class MyFrame if __name__ == "__main__": app = wx.PySimpleApp(0) wx.InitAllImageHandlers() main_frame = MyFrame(None, -1, "") app.SetTopWindow(main_frame) main_frame.Show() app.MainLoop() </code></pre> <p>timer.py</p> <pre><code>import threading import time class Timer(threading.Thread): def __init__(self, seconds, track): threading.Thread.__init__(self) self.total_time = seconds self.track = track def run(self): for sec in range(self.total_time): time.sleep(60) self.track.set_label() </code></pre> <p>settimer.py</p> <pre><code>#!/usr/bin/env python # -*- coding: utf-8 -*- # generated by wxGlade 0.6.3 on Fri Jul 9 16:49:11 2010 import wx import timer # begin wxGlade: extracode # end wxGlade class Timer(wx.Frame): def __init__(self, *args, **kwds): # begin wxGlade: Timer.__init__ kwds["style"] = wx.DEFAULT_FRAME_STYLE wx.Frame.__init__(self, *args, **kwds) self.hours_text = wx.TextCtrl(self, -1, "") self.hours = wx.StaticText(self, -1, "HH") self.minutes_text = wx.TextCtrl(self, -1, "") self.minutes = wx.StaticText(self, -1, "MM") self.set = wx.Button(self, -1, "Set") self.out_instance = None self.__set_properties() self.__do_layout() self.Bind(wx.EVT_BUTTON, self.on_set, self.set) # end wxGlade def __set_properties(self): # begin wxGlade: Timer.__set_properties self.SetTitle("Set Timer") self.hours_text.SetMinSize((40, 25)) self.hours.SetFont(wx.Font(12, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.minutes_text.SetMinSize((40, 25)) self.minutes.SetFont(wx.Font(12, wx.DEFAULT, wx.NORMAL, wx.BOLD, 0, "")) self.set.SetMinSize((50, 27)) # end wxGlade def __do_layout(self): # begin wxGlade: Timer.__do_layout flex_sizer = wx.FlexGridSizer(1, 5, 0, 4) flex_sizer.Add(self.hours_text, 0, 0, 0) flex_sizer.Add(self.hours, 0, wx.ALIGN_CENTER_VERTICAL, 0) flex_sizer.Add(self.minutes_text, 0, 0, 0) flex_sizer.Add(self.minutes, 0, wx.ALIGN_CENTER_VERTICAL, 0) flex_sizer.Add(self.set, 0, wx.ALIGN_CENTER_VERTICAL, 0) self.SetSizer(flex_sizer) flex_sizer.Fit(self) flex_sizer.AddGrowableRow(1) flex_sizer.AddGrowableCol(3) self.Layout() # end wxGlade def get_out_instance(self, out): # get the instance of trackwork # this method is meant to be called outside this class self.out_instance = out def on_set(self, event): # wxGlade: Timer.&lt;event_handler&gt; self.out_instance.hours = int(self.hours_text.GetValue()) self.out_instance.minutes = int(self.minutes_text.GetValue()) self.out_instance.set_label() t = timer.Timer(self.out_instance.minutes, self.out_instance) t.start() self.Destroy() event.Skip() # end of class Timer </code></pre>
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