converting D's string to use with C API with unicode

[IGotD-]

On Saturday, 5 December 2020 at 19:51:14 UTC, Jack wrote:
> So in D I have a struct like this:
>
>>struct ProcessResult
>>{
>>	string[] output;
>>	bool ok;
>>}
>
> in order to use output from C WINAPI with unicode, I need to 
> convert each string to wchar* so that i can acess it from C 
> with wchar_t*. Is that right or am I missing anything?
>
>
>>struct ProcessResult
>>{
>>	string[] output;
>>	bool ok;
>>
>>	C_ProcessResult toCResult()
>>	{
>>		auto r = C_ProcessResult();
>>		r.ok = this.ok; // just copy, no conversion needed
>>		foreach(s; this.output)
>>			r.output ~= cast(wchar*)s.ptr;
>>		return r;
>>	}
>>}
>
>>version(Windows) extern(C) export
>>struct C_ProcessResult
>>{
>>	wchar*[] output;
>>	bool ok;
>>}

I would just use std.encoding

https://dlang.org/phobos/std_encoding.html

and use transcode

https://dlang.org/phobos/std_encoding.html#transcode