Just to gain familiarity with the -
getLineStart:end:contentsEnd:forRange, I tried the following
fantasy code :
unsigned* startIndex=47;
This will make the startIndex variable a memory address which
potentially points to an unsigned int. It declares a holder for the
address only, not for the unsigned. Initializing it to 47 makes it
point to memory address 47 (probably invalid and not an unsigned).
The by-reference arguments of the -getLineStart:... method are
"unsigned *" -- you need to provide an address of an unsigned int
where the method can store the number. To do that, you can declare
some variables normally, and use the C address-of operator (&) to get
their addresses:
Your original code was passing in 47 for the startIndex pointer,
meaning that the method was trying to write over whatever was at
memory address 47, causing an exception and crashing the app.
Jonathon Mah
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