Re: How to detect string encoding before reading a file in NSString?
Re: How to detect string encoding before reading a file in NSString?
- Subject: Re: How to detect string encoding before reading a file in NSString?
- From: Greg Guerin <email@hidden>
- Date: Tue, 26 Apr 2011 13:41:14 -0700
Laurent Daudelin wrote:
I've found different ways to do that (some pure Cocoa, some using
Carbon) but I was wondering about the wisdom of this list as to
what is the best way to detect the encoding of a file before
passing it to NSString initWithContentsOfFile:encoding:error:?
You might not have to guess at all, if the file has an xattr of
"com.apple.TextEncoding" attached to it. I don't know if any of the
NSString encoding-guessing methods use this xattr or not. It's easy
to test, though: TextEdit.app writes the xattr when you Save As and
choose an encoding.
The contents of the xattr is a text-encoding name (such as "utf-8"),
then a semicolon, then a longish decimal number.
You can see a file's xattrs with the xattr command in Terminal. Type
'xattr -h' for a summary of options and args. The xattr API works
great in C (BSD functions, exist since OS 10.4 Tiger).
Google search terms:
xattr site:developer.apple.com
-- GG
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