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.spl it(os.path.base name(pathname), '.' )[1]

then later on i want to create a Photoimage using

ImageTk.PhotoIm age(file=pathna me) 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(some thing like
[''jpg','jpeg',' png','gif'...] ) or is there a better way?

gordon

[Marc 'BlackJack' Rintsch]

Re: compatible image type

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

then later on i want to create a Photoimage using
>
ImageTk.PhotoIm age(file=pathna me) 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(some thing 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]

Re: compatible image type

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.spl it(os.path.base name(pathname), '.' )[1]
>
then later on i want to create a Photoimage using
>
ImageTk.PhotoIm age(file=pathna me) 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(some thing 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.splitex t(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