Object passing in a new thread python

Asked Apr 09 '17 at 05:51

Active Apr 09 '17 at 05:56

Viewed 131 times

I am facing problem with tkinter. I declared root = tkinter.Tk(). Then I want to run a canvas widget in a new thread. Problem is passing root object. Is there any solution?`

root = tkinter.Tk()
def f():
    text = StringVar() 
    scrollView=Label(root,height=1,width=20,bg="white",
    textvariable=text,anchor=NW)
    scrollView.pack()

    scrollString = "This is a test. Woking with pi. This is a great tool for 
    developing any handy device."
    #Time delay between chars, in milliseconds
    for i in range(len(scrollString)+1):
        s = scrollString[i:]
        text.set(s)
        sleep(.1)
        root.update()

t1 = threading.Thread(target=f)
print "Starting thread"
t1.start()

edited Apr 09 '17 at 05:56

asked Apr 09 '17 at 05:51

Zulkar Nayem

Possible duplicate of [How do you run your own code alongside Tkinter's event loop?](http://stackoverflow.com/questions/459083/how-do-you-run-your-own-code-alongside-tkinters-event-loop) – Tadhg McDonald-Jensen Apr 09 '17 at 06:12
note that the callback passed to ".after" should be responsible for a single update, not a whole loop of updates. – Tadhg McDonald-Jensen Apr 09 '17 at 06:13
Do not forget to declare `global root` in `f()` – Billal Begueradj Apr 09 '17 at 06:22
`global root` is not working @BillalBEGUERADJ – Zulkar Nayem Apr 09 '17 at 06:38
Script is running fine when I am declaring `tkinter.Tk()` object inside another thread where `.update` attributed.. But I need to declare it in main thread. @TadhgMcDonald-Jensen – Zulkar Nayem Apr 09 '17 at 06:46
1

you cannot "run a canvas widget in a new thread". All tkinter widgets must be created and manipulated in the same thread. – Bryan Oakley Apr 09 '17 at 12:49
@ZulkarNayem prehaps on your system but the exact code run on my machine gives me the error: `RuntimeError: main thread is not in main loop`, tkinter is not stable with threads. – Tadhg McDonald-Jensen Apr 13 '17 at 17:31
Yes you are right. I also think so. @TadhgMcDonald-Jensen – Zulkar Nayem Apr 19 '17 at 06:36

Object passing in a new thread python

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