Re: [MACTCL] success: adding a custom preview image to a file

[Philip A. <phi...@sh...>]

On Dec 11, 2007, at 9:02 AM, Uwe Kirschner wrote:

> Thanks for pointing out Tclresource to me!

> This is a great package and I did experiment with it but in the end =20=

> I had to abandon the 'pnot' approach altogether since it turns out =20
> that the file open dialog uses the 'pnot' resource but the finder =20
> window doesn't.

> Finally I found SetCustomIcon.c at developer.apple.com which uses =20
> an 'icns' resource instead of 'pnot'. This gave me a starting =20
> point. I skipped all of the UI and QT stuff in the example and just =20=

> used the functions that store the icon in the resource fork. I pass =20=

> in the pixelPtr of a photo image and convert from RGBA to ARGB. One =20=

> must still create a mask image from the photo's alpha channel.

> The reason for this approach - although somewhat old-fashioned - =20
> is  that the 'icns' preview icon will be displayed in the finder =20
> window als well as in the tk_getOpenFile dialog with no need for =20
> any further   programming.

Hi Uwe,

Actually I didn't know that using a custom 'icns' is a substitute/=20
fallback/replacement for 'pnot'. Otherwise I probably would have =20
mentioned that the built-in tool 'sips' which when called as 'sips -i =20=

file [file =E2=80=A6]' will generate the custom icns resource from many =20=

image formats. This could save you some bother in the future because =20
the example code is using obsolete calls -- some of which I think are =20=

completely removed in Leopard.


Philip Aker
echo astwta@lvpc.dslh@nl | tr a-z@. p-za-o.@