On Aug 26, 7:57*pm, Peter Duniho <NpOeStPe...@NnOwSlPiAnMk.com> wrote:
> sadegh wrote:
> > Hi,
> > By click on image files in the right side of windows browser, a
> > preview of that image is shown in the left side of browser in
> > "details" window.
> > I need to do some changes in that preview of image (without changing
> > in the original file). For example, show that preview image in gray
> > level while the original is a color image.
>
> > Any help or links are appreciated.
>
> > BTW, I use windows XP OS, and C# .Net 2008.
>
> There's nothing in .NET that supports this.
>
> I am not even sure of the specific unmanaged API used in XP to support
> preview of files. *For all I know, only those document types
> specifically supported by XP will work. *The API I'm aware for this was
> introduced in Vista. *You can find some information on that here:http://msdn.microsoft.com/en-us/magazine/cc163487.aspx
>
> Even if there's an unmanaged API, shell extensions written with managed
> code are unsupported for .NET 3.5 and earlier, because of versioning
> issues (you can't load different versions of .NET 3.5 and earlier into
> the same process, so a shell extension written that targets one version
> could prevent shell extensions written in another from loading in the
> Windows Shell).
>
> I have it on good authority that, should a new version actually be
> released (they've been saying it will be out soon, but so far hasn't
> been), Microsoft's Windows API Code Pack will include support for
> writing preview handlers. *But again, it will use the API introduced in
> Vista and so won't work on XP. *If you're curious, you can look here:http://code.msdn.microsoft.com/WindowsAPICodePack
>
> Pete
Thanks, Peter.
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