Question

I’m new to iPhone development, I want to convert a string to hex format.

For example 00A400024F01 to 0x00,0xA4,0x00,0x02,0x4F,0x01 I guess I should start by dividing the string and then convert the grouped value. I don’t know how to do that.

Answer 1

u just found answer from this stackoverflow question:-

How to convert an NSString to hex values

+ (NSString *) stringToHex:(NSString *)str
    {   
        NSUInteger len = [str length];
        unichar *chars = malloc(len * sizeof(unichar));
        [str getCharacters:chars];

        NSMutableString *hexString = [[NSMutableString alloc] init];

        for(NSUInteger i = 0; i < len; i++ )
        {
            // [hexString [NSString stringWithFormat:@"%02x", chars[i]]]; /*previous input*/
            [hexString appendFormat:@"%02x", chars[i]]; /*EDITED PER COMMENT BELOW*/
        }
        free(chars);

        return [hexString autorelease];
    }

UPDATE

You can divide one sting on to two string using below method:-

NSString * mystring = @"Hello,How are you";// suppos your string like that
NSArray * array = [mystring componentsSeparatedByString:@","];
NSString * str1 = [array objectAtIndex:0]; //Hello
NSString * str2 = [array objectAtIndex:1]; //How are you

and if you want to murge two string in to one string like :-

NSString *str1=@"hi Sweet Lady";
NSString *str2=@"How are you";

NSString *mainstr=[NSString stringWithFormat:@"%@ %@",str1,str2];

Output is ==== hi Sweet Lady How are you