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Re: Best way to discover resource forks?
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Re: Best way to discover resource forks?


  • Subject: Re: Best way to discover resource forks?
  • From: Steve Christensen <email@hidden>
  • Date: Tue, 11 Jul 2006 13:59:47 -0700

On Jul 11, 2006, at 1:47 PM, Chris Suter wrote:

On 12/07/2006, at 5:40 AM, Steve Christensen wrote:

If you're trying to determine if a file contains resources (in either fork), you'd need to try opening the fork(s) using Resource Manager APIs, which would be considerably more time consuming.

I don't believe you need to open the file to find out if a file contains resources.


You can use the BSD function getattrlist. On Tiger you can also the BSD extended attribute API. See man pages for getattrlist and listxattr. The extended attribute name for the resource fork is defined by the constant XATTR_RESOURCEFORK_NAME (defined in /usr/ include/sys/xattr.h).

You can also access resource forks as if they are regular files by appending "/..namedfork/rsrc" to the name of the file. You may need to check when this was introduced if you need it to work on older systems.

The reason why I mentioned opening the resource file using Resource Manager APIs is that there is nothing in the File Manager APIs to prevent you from creating a resource fork for a file and filling it with whatever data you want.


The resource fork is an HFS file system feature that knows nothing of resource -files-. That there are such special file formats called "resource files" is by convention only and is managed by the Resource Manager, sitting on top of the file system. It's really no different from having a file called foo.pdf that contains a Word document; while there is likely to be some confusion, the file system doesn't prevent you from doing it.

steve

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  • Follow-Ups:
    • Re: Best way to discover resource forks?
      • From: Uli Kusterer <email@hidden>
References: 
 >Best way to discover resource forks? (From: Scott Ellsworth <email@hidden>)
 >Re: Best way to discover resource forks? (From: Ryan Britton <email@hidden>)
 >Re: Best way to discover resource forks? (From: Steve Christensen <email@hidden>)
 >Re: Best way to discover resource forks? (From: Chris Suter <email@hidden>)

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