Convert HEX NSString to an ASCII NSString

Question

I got an NSString containing a hex value which I would like to convert in ASCII. How can I do this?

NSString * hexString = // some value NSString * asciiString = // ? convert hexString to ASCI somehow

INCORRECT APPROACH THAT I TRIED:

I tried the following approach that I found on a similar question but it did not work for me:

 NSData *_data = [hexString dataUsingEncoding:NSUTF8StringEncoding]; NSMutableString *_string = [NSMutableString stringWithString:@""]; for (int i = 0; i < _data.length; i++) { unsigned char _byte; [_data getBytes:&_byte range:NSMakeRange(i, 1)]; if (_byte >= 32 && _byte < 127) { [_string appendFormat:@"%c", _byte]; } else { [_string appendFormat:@"[%d]", _byte]; } } asciiString = _string; // Still shows the same as before..

Jiri Zachar · Accepted Answer · 2015-08-07 10:05:17Z

this works for me:

NSString * str = @"312d4555"; NSMutableString * newString = [[NSMutableString alloc] init]; int i = 0; while (i < [str length]){ NSString * hexChar = [str substringWithRange: NSMakeRange(i, 2)]; int value = 0; sscanf([hexChar cStringUsingEncoding:NSASCIIStringEncoding], "%x", &value); [newString appendFormat:@"%c", (char)value]; i+=2; } NSLog(@"%@", newString);

output is: hello

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