Re: Patching an application (long)

FROM : Sven A. Schmidt
DATE : Thu Jan 16 18:10:39 2003

Adam,

thanks a lot for you reply.

On Donnerstag, Januar 16, 2003, at 05:20  Uhr, Adam Atlas wrote:

> Hi Sven,
>
> libPatch is deprecated and unsupported. Its author, Ed Wynne, was
> ordered to stop maintaining and distributing it by Apple (who he works
> for). Not only that, but it is basically nonfunctional on Mac OS X. A
> runtime-level modification you may want to look at is Method
> Swizzling, posted on CocoaDev:
> http://cocoadev.com/index.pl?MethodSwizzling


I don't see how MethodSwizzling could replace the functionality I get
from libPatch. libPatch allows me to load my bundle into the target
application. Inside my bundle I use a category and MethodSwizzling to
override the target object's original method.

Are you saying that I can replace method implementations across
application boundries, i.e. without having to load a bundle into an
application? (Even with the current setup it probably wouldn't be hard
to patch an installer with a text field category that pipes keystrokes
to a file. I haven't tried libPatch on a root process yet, though.)

As you can see from my follow up on my own mail, I got the whole thing
working now, but I'm still very interested in any alternatives,
especially since you indicate that there might be problems with
libPatch.

Thanks again,
Sven

> If that also doesn't work for you, you could license APE from
> Unsanity. Licenses are free, if the product it is used in is freeware.
> If you're only doing this within your own app (you don't need your
> code to run in other programs), contact them about Ape Lite, a
> shared-library version which is more lightweight and better for that
> purpose. (Ape Lite is not listed on their site; you need to contact
> them about it.) Before that, I do suggest you try Method Swizzling.
>
> Since these things are more hacky than general discussion on this
> list, I recommend the extendamac-macosx list for questions like this.
> See http://lists.sourceforge.net/lists/listinfo/extendamac-macosx

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