Re: [Pythonmac-SIG] detecting aliases

[Lee Cullens]

Thanks for the reply Bob.  I've been digging around in the Python Documentation Macintosh and more specifically Carbon.File.   (All seems to be a bit of a secret society :~) with scant docs that are not up to date and no content in __doc__s so it's a little hard going) What you noted doesn't seem to work verbatim for me, but noting the following from the Python site googling: ResolveAliasFile(file)    Resolve an alias file. Returns a 3-tuple (fsspec, isfolder, aliased) where fsspec is the resulting FSSpec object,  isfolder is true if fsspec points to a folder and aliased is true if the file was an alias in the first place (otherwise the FSSpec object for the file itself is returned). and following your lead I got the following where ppath is an Aqua alias to a folder so I need to check for an Aqua alias to a file: >>> FSResolveAliasFile(ppath, 1) (<Carbon.File.FSRef object at 0xe0a70>, 1, 1) >>> FSResolveAliasFile(ppath, 1)[0].as_pathname() '/Library/Documentation' with the FSRef though I get the following  >>> def is_alias(ppath): ...      return FSRef(ppath)[0] ... >>> ppath = '/Users/Chinook/Documents/Personal/Sys Documentation alias 1' >>> is_alias(ppath) Traceback (most recent call last):   File "/Applications/WingIDE-Professional-2.0.3/WingIDE.app/Contents/MacOS/src/debug/server/_sandbox.py", line 1, in ?     # Used internally for debug sandbox under external interpreter   File "/Applications/WingIDE-Professional-2.0.3/WingIDE.app/Contents/MacOS/src/debug/server/_sandbox.py", line 2, in is_alias     if __name__ == '__main__': TypeError: unsubscriptable object   Or from the Terminal: Python 2.4.1 (#2, Mar 31 2005, 00:05:10) [GCC 3.3 20030304 (Apple Computer, Inc. build 1666)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import os >>> from Carbon.File import FSResolveAliasFile, FSRef >>> FSRef('/Users/Chinook/Documents/Personal/Sys Documentation alias 1') <Carbon.File.FSRef object at 0x16cd8> >>> def is_alias(ppath): ...   return FSRef(ppath)[0] ... >>> ppath = '/Users/Chinook/Documents/Personal/Sys Documentation alias 1' >>> is_alias(ppath) Traceback (most recent call last):   File "<stdin>", line 1, in ?   File "<stdin>", line 2, in is_alias TypeError: unsubscriptable object >>> Guess I'll have to do some more googling, but it (tentatively) looks like I'm getting back a file ref object as if .data is a default and I have to look at what other methods are available. Thanks again, Lee C On Jun 5, 2005, at 11:02 PM, Bob Ippolito wrote: On Jun 5, 2005, at 7:09 PM, Lee Cullens wrote: One of my little utilities needs to know when it encounters links/ aliases. I can of course detect a Unix symbolic link with os.path.islink ('path') and determine what it points to with os.readlink('path'), but an Aqua alias only triggers os.isfile and it has a size of zero. The size is not a reliable indicator though and I was wondering how (in Python) to detect such and determine what it points to. Is this one of those OS unique things where I need to get into the dev tools to resolve? I've been putting such off till I get into ObjC, since Bob said I would understand the interfaces better then. Aliases have nothing to do with Objective-C, they're only dealt with from Carbon. import os from Carbon.File import FSResolveAliasFile, FSRef def resolve_alias(path):     # resolve an alias, if not an alias then it will just return the     # given path.     return FSResolveAliasFile(path, True)[0].as_pathname() def is_alias(path):     # return 1 if an alias, 0 otherwise     return FSRef(path)[0] -bob

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