hi
i am trying to display an image on a canvas in a gui made with Tkinter
widgets
class PhotoDisplay:
def __init__(self,p arent):
self.mainframe = Frame(parent,ba ckground="grey" )
.....
#added a subframe to hold canvas and button
....
self.canvFrame= Frame(self.main frame,...)
....
self.mycanvas=C anvas(self.canv Frame,...)
...
def okbuttonClick(s elf):
self.mycanvas.d elete(ALL)
myimagename=... #get an imagefilename from somewhere..
self.showSelect edImage(myimage name)
def showSelectedIma ge(self,imageNa me):
myimg=ImageTk.P hotoImage(file= imageName)
imgtag=self.myc anvas.create_im age(70,100,imag e=myimg)
self.mycanvas.u pdate_idletasks ()
when i click the button ,the image is displayed for a fraction of a
second on the canvas and disappears.I couldn't figure out why this is
happening.I am quite new to Tkinter and still going thru Fredrik
Lundh's intro to tkinter..can someone tell me if i am doing sthing
wrong here?
thanks in advance
harry
1  3123 
On Thu, Aug 28, 2008 at 4:07 PM, harryos <os**********@g mail.comwrote:
hi
i am trying to display an image on a canvas in a gui made with Tkinter
widgets
class PhotoDisplay:
def __init__(self,p arent):
self.mainframe = Frame(parent,ba ckground="grey" )
.....
#added a subframe to hold canvas and button
....
self.canvFrame= Frame(self.main frame,...)
....
self.mycanvas=C anvas(self.canv Frame,...)
...
def okbuttonClick(s elf):
self.mycanvas.d elete(ALL)
myimagename=... #get an imagefilename from somewhere..
self.showSelect edImage(myimage name)
def showSelectedIma ge(self,imageNa me):
myimg=ImageTk.P hotoImage(file= imageName)
imgtag=self.myc anvas.create_im age(70,100,imag e=myimg)
self.mycanvas.u pdate_idletasks ()
when i click the button ,the image is displayed for a fraction of a
second on the canvas and disappears.I couldn't figure out why this is
happening.I am quite new to Tkinter and still going thru Fredrik
Lundh's intro to tkinter..can someone tell me if i am doing sthing
wrong here?
You have to keep a reference to these images you are creating,
otherwise as soon as those methods finishes they are gone.
thanks in advance
harry
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