Re: Gdk::PixbufFormat

[Andreas Volz <lists brachttal net>]

Am Sat, 1 Dec 2007 22:12:44 +0100 schrieb Andreas Volz:

> Hello,
> 
> I need to find out the format of a file that I display with Pixbuf.
> Gdk::PixbufFormat looks good, but I've no idea how to use it. Could
> anyone tell me how to use it?

As background info why I need this:

in the normal case I use Gdk::Pixbuf::create_from_file() to load images
into my application. But in a special case I load images from a cache
directory that has only names like:

1183526716  1719181811  2285749610  3283493605  3889420936  617060752
1206182082  1726820500  2369683778  334370454   3917029890  699709512
1287426164  173772501   2458688180  3359494770  4089503340  705928064
...

But if I give that names to Gdk::Pixbuf::create_from_file() no files
are loaded. Does Pixbuf really only use the file extensions to get the
format? Isn't is possible to auto detect it from the content?

Another idea may be to give the "real" name as detect option to Pixbuf,
but the filename to load the file. I've this name, because I saved it
to a database.

Or would be possible to rename a cache file to it's "real" .jpeg name
before loading and rename it back after loading. But I don't like this.

Perhaps it's possible to inherit a class from Gdk::Pixbuf and access
some protected data to do what I like.

regards
Andreas