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digitalmars.D.learn - How to convert hex string to string or ubytes? Thanks.

reply FrankLike <1150015857 qq.com> writes:
Now,I can get the string from hex string in compile time,but how 
to get it in run time?

How to get it in run time?

Thanks.
Feb 04 2018
next sibling parent "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Mon, Feb 05, 2018 at 05:48:00AM +0000, FrankLike via Digitalmars-d-learn
wrote:

 Now,I can get the string from hex string in compile time,but how to
 get it in run time?
 
 How to get it in run time?
 
 Thanks.


	import std.conv;
	string hex = "900D1DEA";
	uint value = hex.to!uint(16);
	assert(value == 0x900D1DEA);


T

-- 
Be in denial for long enough, and one day you'll deny yourself of things you
wish you hadn't.
Feb 04 2018
prev sibling parent reply "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Mon, Feb 05, 2018 at 05:48:00AM +0000, FrankLike via Digitalmars-d-learn
wrote:

 Now,I can get the string from hex string in compile time,but how to
 get it in run time?
 
 How to get it in run time?


[...]

Oh wait, I think I misunderstood your original question. Perhaps this is
closer to what you want:

	import std.algorithm;
	import std.array;
	import std.conv;
	import std.range;

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


T

-- 
Study gravitation, it's a field with a lot of potential.
Feb 04 2018
next sibling parent FrankLike <1150015857 qq.com> writes:
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



 	assert(str == "Hello world!");


Thanks.very good!
Feb 04 2018
prev sibling next sibling parent FrankLike <1150015857 qq.com> writes:
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 = 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.
Feb 04 2018
prev sibling parent reply FrankLike <1150015857 qq.com> writes:
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.
Feb 05 2018
next sibling parent reply tetyys <tetyys tetyys.com> writes:
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.
Feb 05 2018
parent FrankLike <1150015857 qq.com> writes:
On Monday, 5 February 2018 at 09:45:11 UTC, tetyys wrote:

 On Monday, 5 February 2018 at 08:41:43 UTC, FrankLike wrote:



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


Thank you.I got my error.
Feb 05 2018
prev sibling parent reply Seb <seb wilzba.ch> writes:
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;


md5Of already returns an ubyte[] array.

Use toHexString to get the string:

https://dlang.org/phobos-prerelease/std_digest.html#.toHexString

Try it here:

---
import std.algorithm, std.range, std.stdio, std.conv, std.digest, 
std.digest.md, std.range;
"foo".md5Of.writeln;
"foo".md5Of.toHexString.writeln;
"foo".md5Of.toHexString!(LetterCase.lower).writeln;
"foo".md5Of.toHexString[].chunks(2).map!(a => 
a.to!ubyte(16)).writeln;
---

https://run.dlang.io/is/zoH7fE
Feb 05 2018
parent FrankLike <1150015857 qq.com> writes:
On Monday, 5 February 2018 at 10:04:10 UTC, Seb wrote:

 On Monday, 5 February 2018 at 08:41:43 UTC, FrankLike wrote:



 auto input = cast(string)hexString(hash);


 Use toHexString to get the string:


Sorry,'hexString(hash)' is my clerical error.

Thank you.I got the answer "no array".
Feb 05 2018