Wrong output of quotes in Windows (encoding?)

[Hugo Florentino]

On Wed, 18 Dec 2013 10:05:49 -0800, Ali Çehreli wrote:
> On 12/18/2013 05:32 AM, Hugo Florentino wrote:
>
>> output is incorrect in Windows (even with unicode-supporting
>> fonts).
>
> Is the code page also set to UTF-8? I think you must issue the
> command 'chcp 65001'.
>
> I have changed your program to print the code units individually in
> hex. I changed the test string to a single space character so that 
> you
> can identify it easily on the output:
>
> import std.stdio, std.string, std.encoding;
>
> @trusted string quote(in string str, in char chr = 'd') pure {
>   switch(chr) {
>     case 'b': return '`' ~ str ~ '`'; // backtick
>     case 'd': return `"` ~ str ~ `"`; // double
>     case 'f': return `«` ~ str ~ `»`; // french
>     case 's': return `'` ~ str ~ `'`; // single
>     case 't': return `“` ~ str ~ `”`; // typographic
>     default: return `"` ~ str ~ `"`; // double
>   }
> }
>
> void main() {
>   char[] a = ['b', 'd', 'f', 's', 't'];
>   auto input = " ";
>   foreach(char type; a)
>       writeln(format("Quote type %s:\t%(%02x %)", type,
>                      cast(ubyte[])quote(input, type)));
> }
>
> Does the output of the program look correct according to UTF-8? Then
> your compiler has produced a correct program. :) Here is the output I
> get on SL6.1 compiled with dmd v2.065-devel-41ebb59:
>
> Quote type b:	60 20 60
> Quote type d:	22 20 22
> Quote type f:	c2 ab 20 c2 bb
> Quote type s:	27 20 27
> Quote type t:	e2 80 9c 20 e2 80 9d
>
> I trust the correctness of this feature of D so much that I am too
> lazy to check whether those code units correspond to the intended
> Unicode characters. :)
>
> Ali

Changing the codepage worked indeed. Thanks.
Now, how could I do that programmatically, so that if my application 
runs on a system with a different codepage, the output looks correct?
After all, not all users feel comfortable typing unknown commands.