Re: string to character code hex string

[lithium iodate via Digitalmars-d-learn]

On Saturday, 2 September 2017 at 16:52:17 UTC, Ali Çehreli wrote:
On 09/02/2017 09:23 AM, bitwise wrote:
On Saturday, 2 September 2017 at 15:53:25 UTC, bitwise wrote:
[...]

This seems to work well enough.

string toAsciiHex(string str)
{
    import std.array : appender;

    auto ret = appender!string(null);
    ret.reserve(str.length * 2);
    foreach(c; str) ret.put(format!"%x"(c));
    return ret.data;
}


Lazy version, which the user can easily generate a string from 
by appending .array:

import std.stdio;

auto hexString(R)(R input) {
    import std.conv : text;
    import std.string : format;
    import std.algorithm : map, joiner;
    return input.map!(c => format("%02x", c)).joiner;
}

void main() {
    writeln("AAA".hexString);
}

To generate string:

    import std.range : array;
    writeln("AAA".hexString.array);

Ali

Please correct my if i'm wrong, but it think this has issues 
regarding unicode.
"ö…" becomes "f62026", which, interpreted as UTF-8, is a control 
character ~ " &", so you either need to add padding or use 
.byCodeUnit so it becomes "c3b6e280a6" (correct UTF-8) instead.