What is the alternative to the setlocale function of c in D? Thank you.

[John Chapman]

On Sunday, 27 January 2019 at 16:23:42 UTC, FrankLike wrote:
> On Sunday, 27 January 2019 at 10:44:04 UTC, John Chapman wrote:
>> On Sunday, 27 January 2019 at 06:14:15 UTC, FrankLike wrote:
>>> On Saturday, 26 January 2019 at 09:33:33 UTC, John Chapman 
>>> wrote:
>
>>>
>>>> What has that code got to do with setting the console's 
>>>> font? So you need to add more code to accomplish that.
>>>
>>> You don't need to set the font to achieve the goal, why not?
>>
>> This should work:
>>
>> const(char)[] toCodePage(const(char)[] s, uint codePage = 0) {
>>   import core.sys.windows.winnls, std.utf;
>>
>>   foreach (char c; s) {
>>     if (c >= 0x80) {
>>       auto temp = s.toUTF16z();
>>       char[] result;
>>       if ((result.length = WideCharToMultiByte(codePage, 0, 
>> temp, -1, null, 0, null, null)) != 0)
>>         WideCharToMultiByte(codePage, 0, temp, -1, result.ptr, 
>> cast(int)result.length, null, null);
>>       return result;
>>     }
>>   }
>>   return s;
>> }
>>
>> void main() {
>>   import core.sys.windows.wincon, std.stdio;
>>
>>   SetConsoleOutputCP(936); // Simplified Chinese codepage
>>   writeln("字符".toCodePage(936));
>> }
> Yes.
> ////////////////////////////////////////
> extern(C) int setlocale(int,char*);
>
> static this()
> {
> 	import core.stdc.wchar_;
> 	import core.stdc.stdio;
> 	fwide(core.stdc.stdio.stdout,1);
> 	setlocale(0,cast(char*)"china");
> }
> ///////////////////////////////////////////
> it's simple than yours,and don't need convert every string,why 
> not work after D2.0.78.1?

I've no idea, sorry. A quick scan of D's changelogs between those 
versions doesn't reveal anything relevant. But I wonder how your 
code ever worked - on Windows, calling setlocale with "china" 
returns null, which means it's not a valid locale, so did nothing.

This does the right thing:

   extern(C) int _cwprintf(const(wchar)*, ...);

   void main() {
     SetConsoleOutputCP(936);
     _cwprintf("字符\n");
   }