On Dec 7, 2007, at 11:03 PM, Chipp Walters wrote:
So, I mistakenly thought only .bundle extensions on folders were
bundles-- but, you're saying there are others as well? I've 2
questions:
1. What is the factor which determines whether a folder is treated
like a file?
Here are some notes I picked up from the Apple docs on Bundles.
<http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFBundles/index.html#//apple_ref/doc/uid/10000123i
>
To begin it appears that we have been discussing packages, not
bundles. "It is important to remember the distinction between what is
a bundle and what is a package. The term bundle indicates a directory
with a specific hierarchical structure, whereas the term package
indicates a directory that is treated as an opaque entity by the
Finder. Most bundles (including applications and plug-ins) are also
packages. Some bundles, such as frameworks, are not packages, however."
The Finder uses the following criteria to determine if something is a
package:
* The directory has a known
extension: .app, .bundle, .framework, .plugin, .kext, and so on.
* The directory has its bundle bit set.
* The directory has a known structure type indicating it is a modern
or versioned bundle.
A developer registers their own package extensions with the operating
system. I imagine this is one of the criteria the finder uses.
"To register a document as a package, you must modify the document
type information in your application’s information property list
(Info.plist) file. TheCFBundleDocumentTypes key stores information
about the document types your application supports. For each document
package type, include the LSTypeIsPackagekey with an appropriate
value. The presence of this key tells the Finder and Launch Services
to treat directories with the given file extension as a package."
2. How do you Mac guys handle this? IOW, when you walk through a
folder copying, reading or moving files, how do you know whether or
not you're looking at a folder or a file?
Personally I haven't had to handle it yet. I don't have any
applications that just copy unknown folders around. I'm always copying
folders where I want all contents so I don't have to make a
distinction. It does seem like Revolution needs a better means of
addressing this though.
--
Trevor DeVore
Blue Mango Learning Systems
www.bluemangolearning.com - www.screensteps.com
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