On Nov 11, 2009, at 11:58 AM, Hank Heijink (Mailinglists) wrote:
> So, I'm curious about how -[NSString initWithCString:encoding:] works.
> According to the documentation, it returns "An NSString object initialized
> using the characters from nullTerminatedCString." Does that mean it doesn't
> copy the bytes? Then what does it do? -[NSString initWithUTF8String]
> explicitly states that it returns "An NSString object initialized by copying
> the bytes from bytes."
-initWithCString:encoding: should copy the bytes. You can verify that yourself
with a small test:
char buf[10+1] = "0123456789";
NSString *s = [[NSString alloc] initWithCString:buf
encoding:NSASCIIStringEncoding];
NSLog(@"before %@", s);
memset(buf, 'x', 10);
NSLog(@"after %@", s);
If the bytes were not copied then `before` and `after` would differ.
I don't see any memory errors in your code. My next suspect would be memory
errors in getMetadata() or getLengthOfMetadata(). Try replacing
getLengthOfMetadata(...) with pcLength=10, and/or getMetadata(...) with
memset(pBuffer, 'x', pcLength). If one of those changes makes the crash go away
then those two functions look much more suspicious.
--
Greg Parker [email protected] Runtime Wrangler
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