Trouble displaying image with tkinter

[Rob Williscroft]

sj wrote in news:CWfBg.7694$gY6.5173 at newssvr11.news.prodigy.com in
comp.lang.python: 

> I am just learning to use Tkinter and am having problems displaying
> image files. I am able to display an image using tutorials (such as
> http://www.daniweb.com/code/snippet296.html) But when I try my own
> code all I get is an empty widget. What is wrong with the following
> program? 
> 

The problem is that CPython is (garbage) collecting the image.

The canvas object is using it (i.e. passing to TCL/TK) but not 
keeping a reference to it. change idata to self.idata and all 
should be well.

> 
> from Tkinter import *
> 
> class Foo(Frame):

[snip]

> 
>         idata =    	    
> PhotoImage(file="/home/sj/documents/projects/xaed/images/cat_001.gif")
> 
    	     self.idata = PhotoImage .....

>         canvas = Canvas(width=300,height=200)

Your missing a parent reference in there (self in this case) i.e.:

         canvas = Canvas(self, width=300,height=200)


but when I tested it it didn't seem to matter. I'd guess
however that when the layout gets more complex it will
make a difference.

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/