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Re: NSString vs. unicode encoding
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Re: NSString vs. unicode encoding


  • Subject: Re: NSString vs. unicode encoding
  • From: Shawn Erickson <email@hidden>
  • Date: Wed, 16 Sep 2009 11:31:35 -0700

On Tue, Sep 15, 2009 at 9:04 PM, Johan Kool <email@hidden> wrote:

> Dear list,
>
> I need to work with strings as in stringA. (I don't have much choice, but
> to have it in a NSString at the start.) I want to have the readable output
> "hello world".
>
> NSString *stringA = @"hello\040world";
> NSString *stringB =  [NSString stringWithUTF8String:"hello\040world"] ;
>
> // This works, so I know NSString can deal with the encoding I have in
> stringA
> NSLog(stringB);
>
> // This does not work (as expected)
> NSLog([NSString stringWithUTF8String:[stringA UTF8String]]);
>
> // Nor does this work
> NSLog([NSString stringWithUTF8String:[[stringA
> dataUsingEncoding:NSUTF8StringEncoding] bytes]]);
>
> // Or this for that matter
> NSLog([NSString stringWithUTF8String:[[stringA
> dataUsingEncoding:NSASCIIStringEncoding] bytes]]);


Never pass a string like that to NSLog. NSLog takes the first parameter as
the FORMAT definition for the log statement. It parses that string looking
for %d, etc. and then will attempt pull additional parameters based on what
it parses. So it can cause in proper memory/stack access which can crash
and/or expose information from you processes memory.

Always ensure the first parameter you pass to NSLog is a proper format
string (this goes for any function that takes a format string).

NSLog(@"%@", ...) in this case.

-Shawn
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