Re: How to convert hex string to string or ubytes? Thanks.

[tetyys via Digitalmars-d-learn]

On Monday, 5 February 2018 at 08:41:43 UTC, FrankLike wrote:
On Monday, 5 February 2018 at 06:12:22 UTC, H. S. Teoh wrote:
On Mon, Feb 05, 2018 at 05:48:00AM +0000, FrankLike via

        auto input = "48656c6c6f20776f726c6421";
        auto str = input.chunks(2)
	                .map!(digits => cast(char) 
digits.to!ubyte(16))
                        .array;

But,if the input come from here:

import std.digest.md;
auto hash =md5Of("Some Words");
auto input = cast(string)hexString(hash);

 auto str = input.chunks(2)
                 .map!(digits => cast(char) digits.to!ubyte(16))
                 .array;

Then get an error:
core.exception.UnicodeException@src\rt\util\utf.d(292):invalid 
UTF-8 sequence
--------------
0x0041B8E6
0x00419530
0x0040796F

Thanks.

Casting unknown bytes to string or char is unsafe, and obviously 
some bytes can be invalid UTF8 sequences.