Objective-c EXC_BAD_ACCESS (code=2, address=0x42)?

The function is expecting a pointer to a character, you are giving it a literal character. You need to create a pointer to it. Also characterAtIndex doesn't return a character as you would think.

It returns a unicode character which is actually an unsigned short instead of an unsigned char . However, if you change your code to this it will work.

You need to pass something of the type const unichar *, not just char. You could do this instead.

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