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Re: getCString a good idea here?
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Re: getCString a good idea here?


  • Subject: Re: getCString a good idea here?
  • From: Chris Hanson <email@hidden>
  • Date: Sun, 13 Jul 2003 16:31:16 -0500

On Saturday, July 12, 2003, at 05:30 PM, Michael Hanna wrote:
Hi I'm trying to output to the stdout with a foundation tool. But it seems I'm not using getCString improperly.. I'm certain that the array returns an NSString.

(1) -[NSString getCString:] takes an existing buffer as an argument. This buffer must be large enough to hold a copy of the string converted to the current user's locale's default string encoding. It does *not* return anything. It raises an NSCharacterConversionException if this conversion fails.

(2) Don't use -[NSString getCString:] *or* -[NSString cString]. Ever. Period. Their behavior will differ based on the current user's locale's default string encoding -- you will get different results on different systems for the same string. Instead, always use -[NSString UTF8String] or explicitly get a string's data in an encoding you specify. Or use -[NSString fileSystemRepresentation] if you're going to pass an NSString representing a path to something like fopen().

Apple should have Xcode sound a klaxon and flash your screen whenever it encounters a deprecated method that can cause serious internationalization issues like -[NSString getCString:] or -[NSString cString].

-- Chris

--
Chris Hanson, bDistributed.com, Inc. | Email: email@hidden
Custom Application Development | Phone: +1-847-372-3955
http://bdistributed.com/ | Fax: +1-847-589-3738
http://bdistributed.com/Articles/ | Personal Email: email@hidden
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 >getCString a good idea here? (From: Michael Hanna <email@hidden>)

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