Re: warning at nslog
Re: warning at nslog
- Subject: Re: warning at nslog
- From: Fritz Anderson <email@hidden>
- Date: Sun, 27 Sep 2009 11:33:14 -0500
On 27 Sep 2009, at 11:12 AM, Jos Timanta Tarigan wrote:
i got problem trying to print stuff by using nslog eg. i want to
print absolute path by this:
NSString *absolutePath = [path stringByExpandingTildeInPath];
and i print it with this
NSLog(absolutePath);
it gives me warning:
Format not a string literal and no format arguments.
i got this error a lot eg trying to print class name, proccesId, etc.
What is this error and how can i handle this?
When you pass a computed string, instead of a literal format string,
as a format argument, you are begging for security exploits and
crashes. This is true of NSLog, stringWithFormat:, or printf. The
warning you got is pretty explicit about that.
Consider what happens when your program does this:
NSString * urlString = @"file:///MyVolume/Users/me/mission
/impossible";
NSLog(urlString);
The format parser sees /, tries to pull the float you promised off
the stack, and you crash. The roster of buggy programs is full of
things that "can't happen."
Instead write
NSLog(@"%@", urlString);
— F
--
Fritz Anderson -- Xcode 3 Unleashed: Headed for its third printing -- <http://x3u.manoverboard.org/
>
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