How to convert a text string to hex string?

Question

Lets say I have a text string : \"Say Hello to My Little Friend\"

A function should return hex value as:

5361792048656c6c6f20746f204d79204c6974746c6520467269

Answer 1

You can do this like,

NSString *str = @"Say Hello to My Little Friend";
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];

NSLog(@"data %@",data);

Optput : data <53617920 48656c6c 6f20746f 204d7920 4c697474 6c652046 7269656e 64>

Swift:

 let string = "Say Hello to My Little Friend"
 let data = string.dataUsingEncoding(NSUTF8StringEncoding)

Swift 3:

 let string = "Say Hello to My Little Friend"
 let data = string.data(using: String.Encoding.utf8)