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Can someone explain what the difference is between these two functions?

Is it just that stringWithCString: must end with a null character?

It’s mainly that stringWithCString: is deprecated and should never be used. See General/StringWithCString

To be more specific, stringWithCString: uses an undefined encoding. The encoding it uses may or may not be the one you want, but at least with stringWithUTF8String: you get predictable results. That’s why Apple deprecated stringWithCString:.

FTR, this also applies to -cString and the like. –boredzo

And General/[NSString defaultCStringEncoding]. Although this will tell you what encoding the *cString methods will use.*

that probably isn’t too useful, though, unless you have a menu item in your application titled ‘C String Encoding’. ;) –boredzo