Tkinter - Error on button-click

General Usage
1

Hi,
I’m playing around with Tkinter and don’t understand why I get an error, when
I want to replace a text. The test program should start a new measurement,
but something goes wrong, when the “Repeat”-Button is clicked. The code
I’m playing with it.

using Base.Threads, Tk

l=ReentrantLock()
cn1=Channel{Any}(1)
val1=Atomic{Float64}(0)
val2=Atomic{Float64}(0)

function mt_func()
   lock(l)
   try
      @threads for i = 1:10^6
          atomic_add!(val1,1.924)
      end
      put!(cn1,val1[])
      atomic_cas!(val2,val2[],0.5val1[])
      atomic_xchg!(val1,fetch(cn1)^0.5)
   finally
      unlock(l)
   end 
   return take!(cn1),val2[], val1[]
end

function mt_rep(path)
   set_value(Info1, "Bla,  bla, bla")
end

function prog_end(path)
    destroy(w)
end

function main()
    global w=Toplevel("Systemtest",1048,570)
    pack_stop_propagate(w)
    mFr=Frame(w, padding=[5,5,5,5], relief="groove")
    pack(mFr,expand=true,fill="both")
   
    grid(Label(mFr,"Info"), 1,1, sticky="nw", pady=5)
    Info1=Text(mFr, width=128, height=30, padx=5, relief="flat")
    grid(Info1,2,1, sticky="w")
    Button1=Button(mFr,"Repeat")
    grid(Button1,3,1, sticky="ws", padx=15, pady=15)
    bind(Button1, "command", mt_rep)
    Button2=Button(mFr,"Quit") 
    grid(Button2,3,1, sticky="es", padx=15, pady=15)
    bind(Button2, "command", prog_end)  
    
    et=@elapsed mw,hw,qw=mt_func()
    itxt="""
    Elapsed time: $et seconds
    Threads:      $(Sys.CPU_THREADS)
    val1[]:       $mw
    val2[]:       $hw
    sqrt val1[]:  $qw
    
    \n$(Sys.cpu_info())"""
    set_value(Info1, "$itxt")
 end

 main();

The function that produces the error is mt_rep, no matter what it says.
Any hints?

Thank You

btw.
Sorry for my english, I’m no native speaker.

2

In your function

function mt_rep(path)
   set_value(Info1, "Bla,  bla, bla")
end

Info1 is not defined because it is out of scope.

For a working example just put a global before the initialization of Info1:

global Info1=Text(mFr, width=128, height=30, padx=5, relief="flat")

like you already have done it for

global w=Toplevel("Systemtest",1048,570)

In general relying on global values is not the best design. I can’t find the Tk.jl documentation, in particular for the bind command, so I can’t tell now, how to do it better, e.g. by providing Info1 as a parameter to mt_rep.

3

Oh, I’d overseen the scope of the variable…but now it runs :grinning:
Many thx for your help.
.
btw.
I’m only trying some things with Julia and Tk .This is currently no
seriously code. So the global variables are no problem
The Tk.jl docu is here: Docu Tk.jl