Display realtime output of a subprocess in a tkinter widget
python, python-2.7, subprocess, tkinter
Solution
Finally I found the solution. After the window construction, you must add :
frame.pack()
# force drawing of the window
win.update_idletasks()
And then after every line insertion in the widget, you must also force a refresh with the same method only on the widget.
# insert the line in the Text widget
t.insert(tk.END, out)
# force widget to display the end of the text (follow the input)
t.see(tk.END)
# force refresh of the widget to be sure that thing are displayed
t.update_idletasks()
Problem
My question is almost the same as this one: Widget to Display subprocess stdout? but a step further. I have the following code (python2.7): ``` def btnGoClick(p1): params = w.line.get() if len(params) == 0: return # create child window win = tk.Toplevel() win.title('Bash') win.resizable(0, 0) # create a frame to be able to attach the scrollbar frame = ttk.Frame(win) # the Text widget - the size of the widget define the size of the window t = tk.Text(frame, width=80, bg="black", fg="green") t.pack(side="left", fill="both") s = ttk.Scrollbar(frame) s.pack(side="right", fill="y") # link the text and scrollbar widgets s.config(command=t.yview) t.config(yscrollcommand=s.set) frame.pack() process = subprocess.Popen(["<bashscript>", params], shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: out = process.stdout.readline() if out == '' and process.poll() is not None: break print out t.insert(tk.END, out) ``` The output from the "longrunning" bash script is captured in realtime (appear in the console) but the Tkinter window appear only after the end of the subprocess !! How can I have the window appearing before the subprocess start and update its content in realtime ?