Re: Get Preferred Application Icon URL for a given file
Re: Get Preferred Application Icon URL for a given file
- Subject: Re: Get Preferred Application Icon URL for a given file
- From: JanakiRam <email@hidden>
- Date: Sun, 11 Nov 2007 21:39:54 +0530
NSWorkSpace is some how getting the preferred application image/icon ,
constructing the NSImage object.
Any idea's on how Apple guys did it ?
I also heard that GNU Nextstep is the open source version of Earlier
Cocoa Frameworks. Can i be able to download the sources ?
On 11/11/07, glenn andreas <email@hidden> wrote:
>
>
> On Nov 11, 2007, at 9:23 AM, JanakiRam wrote:
>
> > Hi All,
> > I've a specific requirement to get preferred application Icon
> > for a
> > file.
> >
> > I've gone thru the Cocoa API and found that NSWorkspace is
> > able to
> > get the icon as NSImage but i need to get icon URL , so that my
> > Webkit HTML
> > Page img tag -- can show that image.
>
> You assume such a thing is possible, but there are several problems:
>
> 1) For classic or CFM style apps, the icon could still be part of the
> resource fork for the application. There is thus only a URL for the
> file, not the specific icon within that file.
>
> 2) For other apps, the icons (at different sizes) are stored in
> an .icns file in the thing. I don't believe that WebKit is able to
> display an icns file (since, among other things, it would have to pick
> which size you really wanted, which could easily end up with blocky
> images or blurry ones).
>
> 3) Assuming that LaunchServices keeps each icon as a separate file
> (i.e. with a one to one mapping between icon and URL) in some internal
> cache is either wrong or subject to change, undocumented, unsupported,
> etc... You can't even assume LaunchServices even keeps a cache of
> icons like the old desktop database did under Classic.
>
> >
> >
> > I feel this should be possible may be using some other API or
> > lower
> > level API's.
> >
> > Can any one provide some pointers to solve this problem.
>
> The best thing to do is to provide a custom "file-icon" protocol (or
> "pseudo-CGI" magic URL) that you implement in your program which
> fetches the icon at an appropriate size, and then returns the PNG or
> TIFF representation. See NSURLProtocol (or the various "load request"
> related delegate methods for WebViews). This approach is definitely
> doable, though...
>
>
>
> Glenn Andreas email@hidden
> <http://www.gandreas.com/> wicked fun!
> quadrium | prime : build, mutate, evolve, animate : the next
> generation of fractal art
>
>
>
>
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