On Aug 14, 2010, at 3:14 PM, Peter Otten wrote:
> Chris Hare wrote:
>
>> The scenario is this:
>>
>> I want to loop around all of the images in a given directory (which I know
>> will be images, but I guess I should check), show an image in a window,
>> wait 2 seconds and show the next one and repeat that indefinitley, which
>> will be until the user closes the window.
>>
>> This is the code I extracted from the larger program and made work - sort
>> of - in a standalone fashion. When I run the code, each of the file names
>> gets displayed, and I can view the images, so it has to be something I am
>> doing wrong with this chunk of code.
>>
>> However, I don't see what the problem is.
>
> I have not looked at your code in detail, but event loops and time.sleep()
> don't play together very well. Use after(delay_in_milliseconds, callable)
> instead.
>
> Here's a simple example that loops over images passed from the command line:
>
> import Image
> import ImageTk
> import os
> import sys
> import Tkinter as tk
>
> from itertools import cycle
>
> def next_image():
> imagefile = next(imagefiles)
> image = Image.open(imagefile)
>
> w, h = image.size
> image = image.resize((700, 700*h//w))
>
> label.image = label["image"] = ImageTk.PhotoImage(image=image)
> root.title("Now showing %s" % os.path.basename(imagefile))
>
> root.after(2000, next_image)
>
> if __name__ == "__main__":
> imagefiles = sys.argv[1:]
> assert imagefiles
> imagefiles = cycle(imagefiles)
>
> root = tk.Tk()
> label = tk.Label(root)
> label.pack()
>
> root.after_idle(next_image)
> root.mainloop()
>
Thanks Peter. I threw away what I started with and merged your code into my
class:
class externalLoopDisplay:
def show(self):
main.logging.debug("externalLoopDisplay.show:","start")
self.window = Tk()
self.btnClose = Button(self.window, text="Close",
command=self.window.destroy, bg=backColor,highlightbackground=warnColor,
highlightcolor=okColor)
self.btnClose.grid(row=0, column=2)
self.label = Label(self.window)
self.label.grid(row=1, column=0, columnspan=3)
dirName = getRadarPath() + "/net" + str(netNumber.get()) # e.g.
.../Radar/net17/net17-YYYYMMDDHHMMSS.gif
self.imagefiles = glob.glob(dirName + "/*.gif")
self.imagefiles = cycle(self.imagefiles)
self.window.after_idle(self.next_image)
def next_image(self):
imagefile = next(self.imagefiles)
image = Image.open(imagefile)
w, h = image.size
image = image.resize((600, 550*h//w))
self.label.image = self.label["image"] =
ImageTk.PhotoImage(image=image) # <==== bails here
self.window.title("Now showing %s" % os.path.basename(imagefile))
self.window.after(2000, next_image)
I marked where the code bails with an error saying pyimage2 doesn't exist. All
of the images exist and worked just fine with your standalone script.
Suggestions?
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