compatible image type

[gordon]

hi
in my application a file selection by user returns a pathname string
like F:/images/png/my.png or F:/docs/text/somedoc.txt ....etc.
I can get the extension using
extn=string.split(os.path.basename(pathname),'.' )[1]

then later on i want to create a Photoimage using

ImageTk.PhotoImage(file=pathname) and display it on a canvas.

the extn can be anything ..even zip or bat ,doc whatever depending on
user selection...I want to put someway to raise an error message to
the user if he selects a file with extension not of a compatible image
type for PhotoImage.How should i do this? should i check 'extn' to a
list of compatible image type extensions(something like
[''jpg','jpeg','png','gif'...] ) or is there a better way?

gordon

[Marc 'BlackJack' Rintsch]

On Fri, 04 Jul 2008 01:15:30 -0700, gordon wrote:

then later on i want to create a Photoimage using

ImageTk.PhotoImage(file=pathname) and display it on a canvas.

the extn can be anything ..even zip or bat ,doc whatever depending on
user selection...I want to put someway to raise an error message to
the user if he selects a file with extension not of a compatible image
type for PhotoImage.How should i do this? should i check 'extn' to a
list of compatible image type extensions(something like
[''jpg','jpeg','png','gif'...] ) or is there a better way?

Just catch the exception raised by `PhotoImage` if a non compatible file
was selected!?

Ciao,
Marc 'BlackJack' Rintsch

[Larry Bates]

gordon wrote:

hi
in my application a file selection by user returns a pathname string
like F:/images/png/my.png or F:/docs/text/somedoc.txt ....etc.
I can get the extension using
extn=string.split(os.path.basename(pathname),'.' )[1]

then later on i want to create a Photoimage using

ImageTk.PhotoImage(file=pathname) and display it on a canvas.

the extn can be anything ..even zip or bat ,doc whatever depending on
user selection...I want to put someway to raise an error message to
the user if he selects a file with extension not of a compatible image
type for PhotoImage.How should i do this? should i check 'extn' to a
list of compatible image type extensions(something like
[''jpg','jpeg','png','gif'...] ) or is there a better way?

gordon

You do know that there is a method for getting extensions easily?

extn = os.path.splitext(pathname)[1]

Note: It does include the '.' separator (e.g. it returns .txt) but that's easy
to handle.

If you just catch the exception (as Mark suggested), you don't even have to look
at the extension.

-Larry