Objective-C Equivalent to string.unpack('N') in Ruby

Question

I am trying to convert a string to a 32-bit unsigned, network (big-endian) byte order. I can't seem to figure out how to do this. In Ruby I accomplish this by string.unpack('N') - but can't seem how to manage this in Objective-C. Any suggestions? Thanks!

Answer 1

In Objective-C you would convert NSString to NSData . Then you can access the bytes from the NSData object.

NSString *str = @"😄 H€llö Wòrld";
NSData *data = [str dataUsingEncoding:NSUTF32BigEndianStringEncoding];
NSLog(@"%@", data);
// Output:
// <0001f604 00000020 00000048 000020ac 0000006c 0000006c 000000f6 00000020 00000057 000000f2 00000072 0000006c 00000064>

const uint8_t *bytes = [data bytes]; // pointer to converted bytes
NSUInteger length = [data length];   // number of converted bytes