I know there must be a better way but this was all I could come up with as a 
rookie cocoa programmer to get a substring out of a  very long NSString from a 
textView growing as the operator types in the message content. The receive 
buffer in the chip I am talking to will only take 80 characters before an XOFF 
(buffer 2/3 full).  XON occurs when the chip buffer is reduced to about 1/3 
full.  This routine is in a thread that reads data from the chip as well.

char sndBuffer[65];
int j;

characterIndex++;  // is always sitting at the last character sent so advance 
to the next character in string.
for (j = 0; j < 65; j++) {
    sndBuffer[j] = [string characterAtIndex:characterIndex];
    characterIndex++;
}
sndBuffer[j] = 0x00;
substring = [NSString stringWithUTF8String:sndBuffer];

It works flawlessly, but there oughta be a way without reverting to C?
Suggestions very much welcomed.

JIM ROGERS
jimrogers_w4...@me.com
http://web.me.com/jimrogers_w4atk

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