Question

I’m trying to produce a string from an array of bytes in objective c. Within my class, i define the following constant char

static const char HELLO_WORLD[] = {0x68,0x65,0x6c,0x6c,0x6f,0x20,0x77,0x6f,0x72,0x6c,0x64,0x0d,0x0a};

I then have a method in MyClass that looks like this:

+ (NSString *)stringFromBytes:(const void*)bytes
{
    return [[NSString alloc] initWithBytes:bytes length:(sizeof(bytes)/sizeof(bytes[0])) encoding:NSUTF8StringEncoding];
}

if I call the method by doing this

[MyClass stringFromBytes:HELLO_WORLD];

I get a string that looks like “hell” – im not sure if i’m doing the length part of this correctly, and im assuming thats the issue. Any guidance on how to get that working?

thanks!

Answer 1

Do this:

+ (NSString *)stringFromBytes:(const char[])charbytes length:(NSUInteger)length
{
  return [[NSString alloc] initWithBytes:charbytes length:length encoding:NSUTF8StringEncoding];
}

Use like this:

 NSString *str = [MyClass stringFromBytes:HELLO_WORLD length:sizeof(HELLO_WORLD)];
 NSLog(@"%@",str);