What is the function used to update frame image automatically in python?

Question

I asked this question before and the previous one linked to another question but it didn't solve the problem.

I have a number of images, which are updated frequently in a file. The names of images are on the same pattern (e.g: img1.jpg , img2.jpg ...)

I am programming a GUI on python tkinter to start from the first image and automatically update after 30 second. after many tries, I have no idea how to achieve that because mainloop()function freezes the GUI and the problem is that I need them in one GUI.

Here is the code I used to open and resize images:

from PIL import Image, ImageTk

x=1
class Window(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.master = master
        self.pack(fill=BOTH, expand=1)
        load = Image.open("./images/img%s.jpg"%x)
        load=load.resize((1350,800))
        render = ImageTk.PhotoImage(load)
        img = Label(self, image=render)
        img.image = render
        img.place(x=0, y=0)
        
root = Tk()
app = Window(root)
root.wm_title("Tkinter window")
root.geometry("1350x800")
root.mainloop()

I tried to use label.after(3000,function) but no results came up so I deleted it from the code. Is there any way to solve this problem?

Thanks in advance

What is `load = Image.open("./images/img%s.jpg"%x)` x? what is x? — Delrius Euphoria, Sep 17 '20 at 16:20
@CoolCloud the images names are img1 img2 etc... so i am planning to open the next image by increasing x value every 30 second to show the image — Ali Altaher, Sep 17 '20 at 16:26
@CoolCloud i know i need a solution for this case because it depends on a function and i tried a lot of functions without and benefits — Ali Altaher, Sep 17 '20 at 16:30
I'm pretty sure you didnt kept a reference. Anyway, maybe this will give you an idea of: https://stackoverflow.com/q/62200353/13629335 — Thingamabobs, Sep 17 '20 at 16:36

Delrius Euphoria · Answer 1 · 2020-09-18T22:02:02.387

1

Too big for the comments, But this is a working version of your code:

from tkinter import *
from PIL import Image, ImageTk


class Window(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.master = master
        self.pack(fill=BOTH, expand=1)

        self.x = 1 #assigning x to 1 to start with img1 
        self.load = Image.open(f"./images/img{self.x}.jpg").resize((1350,800),Image.ANTIALIAS) #loading first img
        self.render = ImageTk.PhotoImage(self.load) #instantiating first img
        self.img = Label(self, image=self.render) #labelizing it
        self.img.image = self.render #keeping reference
        self.img.pack() #packing it because place(x=0,y=0) will lead to overwriting of image
        self.master.after(3000,self.update) #calling the function continoursly
    def update(self):
        self.x+=1 #increasing the x by 1 over each call to function
        if self.x < 9:
            self.load = Image.open(f"./images/img{self.x}.jpg").resize((1350,800),Image.ANTIALIAS)
            self.render = ImageTk.PhotoImage(self.load)
            self.img.config(image=self.render) #changing the image of label
            self.master.after(3000,self.update)

root = Tk()
app = Window(root)
root.wm_title("Tkinter window")
root.geometry("1350x800")
root.mainloop()

Hope this helped, do let me know if any errors or doubts.

Cheers

edited Sep 18 '20 at 22:02

answered Sep 17 '20 at 16:44

Delrius Euphoria

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Thanks a lot but this code works for only the first 2 images so i updated it and i will share it in a comment – Ali Altaher Sep 17 '20 at 17:46
@AliAltaher Actually, would appreciate if you accept my answer – Delrius Euphoria Sep 17 '20 at 17:56
`self.rep` is undefined in your second solution. Also `self.master.after(3000, self.update)` is still be executed even though `self.x == 9` is true, is it what your solution wants? – acw1668 Sep 18 '20 at 03:06
@acw1668 what about now? – Delrius Euphoria Sep 18 '20 at 09:54
`self.rep` is still undefined. Actually you don't need to call `after_cancel()`, just use `if self.x < 9: load the image and call after()`. – acw1668 Sep 18 '20 at 09:59
Either ways, its fixed now – Delrius Euphoria Sep 25 '20 at 14:13

score 0 · Answer 2 · answered Sep 17 '20 at 17:46

This code solved my problem:

#from tkinter import *
from PIL import Image, ImageTk
import os
from tkinter import Frame,Label,BOTH,Tk
class Window(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.master = master
        self.pack(fill=BOTH, expand=1)

        self.x = 1
        self.load = Image.open(f"./images/img{self.x}.jpg").resize((1350,800),Image.ANTIALIAS)
        self.render = ImageTk.PhotoImage(self.load)
        self.img = Label(self, image=self.render)
        self.img.image = self.render
        self.img.pack()
        self.master.after(3000,self.update)
    def update(self):
        if self.x<len(os.listdir("./images/")):

            self.x+=1
            self.load = Image.open(f"./images/img{self.x}.jpg").resize((1350,800),Image.ANTIALIAS)
            self.render = ImageTk.PhotoImage(self.load)
            self.img.config(image=self.render)
            self.master.after(3000,self.update)

        else:
            self.x=1
            self.master.after(1,self.update)
root = Tk()
app = Window(root)
root.wm_title("Tkinter window")
root.geometry("1350x800")
root.mainloop()

`after(1, ...)` is somewhat dangerious. You're trying to call a function 1000 times per second which could starve the tkinter event loop. — Bryan Oakley, Sep 17 '20 at 17:47
@BryanOakley no friend it will call once to reset the images index to the first one — Ali Altaher, Sep 17 '20 at 17:51
If `len(os.listdir("./images/"))` is 1 or 0, this code will attempt to run 1000 times per second. — Bryan Oakley, Sep 17 '20 at 18:01

What is the function used to update frame image automatically in python?

2 Answers2