How to convert ASCII value to a character in Objective-C ?

Question

I was wondering if anyone has the following php function equivalents in Objective-C for iPhone development:

1. ord() # returns the ASCII value of the first character of a string.
2. chr() # returns a character from the specified ASCII value.

Many thanks!

Answer 1

//char to int ASCII-code
char c = 'a';
int ascii_code = (int)c;

//int to char
int i = 65; // A
c = (char)i;

Answer 2

This is how you can work with ASCII values and NSString. Note that since NSString is working with unichars, there could be unexpected results for a non ASCII string.

// NSString to ASCII
NSString *string = @"A";
int asciiCode = [string characterAtIndex:0]; // 65

// ASCII to NSString
int asciiCode = 65;
NSString *string = [NSString stringWithFormat:@"%c", asciiCode]; // A

Answer 3

Thanks alleus. It is all I need for my apps.