Re: Simple Tkinter app works in Linux, not in Windows
There is a difference between the above code and your prior code, namely in that you have explicitly instantiated Tk and put your canvas into the root toplevel. Try this in idle where it was failing: snip Problem solved...I tried James' suggestion (explicitly instantiating the root Tk window, and then running the mainloop() as suggested), but it produced the same result i.e. no photo. Ugg... I then looked REALLY closely at my code and noticed that my __init__ function was actually ___init___ (3 underscores instead of 2). Thus, a Frame object was being built, but the __init__ function wasn't getting run. So no image was ever getting added. Silly underscores...or, silly Python newbie :-) It now works under both Linux and Windoze just fine. I would have thought that having no __init__ function would flag an error, but I guess this isn't necessary. I thought about grabbing PDB to debug, and I bet this would have shown the error immediately (i.e., it would never have called the function). Being a newbie is such a joy... Thanks for the help, John -- http://mail.python.org/mailman/listinfo/python-list
Simple Tkinter app works in Linux, not in Windows
Hello, I'm a newbie to Python (literally, within the last two weeks), and I am playing around with Tkinter to build some simple GUIs. I am attempting to build a simple class that displays a GIF. Here is the code: #start of code from Tkinter import * class DisplayPict(Frame): def __init__(self,parent=None): Frame.__init__(self,parent) self.pack() self.img=PhotoImage(file=moon.gif) self.can=Canvas(self) self.can.create_image(2,2,image=self.img,anchor=NW) self.can.pack(fill=BOTH) #keep a reference to the img around self.can.photo=self.img if __name__ == '__main__': DisplayPict().mainloop() #end of code Anyway, I started with this code in Windoze using IDLE, and everytime I ran it I kept getting an empty frame (well, presumably with a Canvas that had nothing in it). I kept thinking that it had to be something to do with the whole images-get-garbage-collected-if-not-referenced issue that I read so much about. So I tried a bunch of different permutations and nothing made a difference. On a whim, I tried this code under Linux, and amazingly, it worked just fine: the image was displayed as expected. So...I am confused. I tried to do my homework (i.e., read through Programming Python, Learning Python, and scouring the internet), but I can't come up with an explanation as to why this doesn't work under Windoze. Can anyone out there show me the error in what I have? Thanks in advance, John O -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple Tkinter app works in Linux, not in Windows
I'm inclined to think that its your python installation. It worked for me with both the cygwin python (both in the console and in an xterm) and it also worked for me with idle using enthought python. I haven't tried the active state python. Thanks for giving it a shot. I just checked the version of Python I was using: 2.3.4 under Linux, and 2.4.2 under Windoze. So there is a difference here I guess, though I'd be surprised if it were actually any kind of fix between the two versions. As a side note, under Win, if I don't put the code in a class it seems to work fine. In other words: #start code from Tkinter import * win = Tk() img = PhotoImage(file=moon.gif) can = Canvas(win) can.create_image(2,2,image=img, anchor=NW) #no requirement for keeping an instance of the image around here win.mainloop() #end code ...and I get a moon displayed in the top-level window. This got me wondering if I was misusing the Frame and/or Canvas widget in some fashion (since obviously there is no Frame in the above snippet). Any other thoughts out there? TIA, John -- http://mail.python.org/mailman/listinfo/python-list
