On 4 Nov 2012, at 1:03 AM, John Delacour wrote:
> Perl is another matter altogether. While I am getting up to speed with Obj-C
> I would like to be able to include Perl routines within projects, and I can
> find very little on the WWW to be guided by. So far I have experimented
> simply with
>
> system ("hard-coded/path/to/file")
This works, but it blocks the entire app while the script runs, and is
suboptimal in some other ways. It's fine for quick&dirty use but I'd recommend
using something like NSTask for a program you're going to ship to other people.
> I have not yet even attempted anything with NSTask and found no way to add
> Perl scripts to the project file tree and refer to them by relative path, so
> you can see I am not very far forward!
Perl scripts would just be ordinary resources as far as Xcode is concerned;
you'd add them to the "copy bundle resources" build phase. Xcode will copy them
into your .app when you build. You can then find the path to a given bundle
resource at run time using NSBundle methods like -pathForResource:ofType:. (The
application itself is a bundle, which can be gotten using [NSBundle
mainBundle]; frameworks, plugins, and the like are also bundles.) The path is
an NSString; if you're giving it to NSTask, you can pass it as-is. If you want
to give the path to a POSIX API (like system() or exec()), you can convert it
to an appropriate C-style string using the -fileSystemRepresentation method.
(In practice the file system representation is just UTF-8, but it's probably
best to use -fileSystemRepresentation instead of hardcoding that bit of
knowledge.)
Hopefully this helps you connect the dots--- all the methods I've mentioned
should have more detailed info in the documentation.
It's also possible to link libperl.dylib directly into your app and use it as
an embedded interpreter. I haven't tried this, though, so I don't know what
problems you might hit.
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