wchar[] and wchar*

[Denis Koroskin]

(I wonder why this message wasn't sent hours ago and stuck in my mailbox, but here it goes:)

On Tue, 07 Apr 2009 09:32:59 +0400, novice2 <sorry at noem.ail> wrote:

> hi!
> could you advice me, please, what techniques should be used
> while working with D wchar[] and C wchar* (e.g. Windows unicode API  
> named ...W()).
>
> how to pass wchar[] to FuncW(wchar*) and back?
>
> thanks!

The easiest way to go is as follows:

import std.string;

// helper functions
wchar* toWptr(wchar[] str, wchar[] buffer = void) {
   size_t len = str.length;
   buffer.length = len + 1;
   buffer[0..len] = str[];
   buffer[len-1] = 0;

   return buffer.ptr;
}

wchar[] fromWptr(wchar* ptr) {
   return ptr[0..wcslen(ptr)];
}

wchar[] s = "Hello, World"w;
wchar[] h = s[0..5];

// usage
FuncW(toWptr(s), toWptr(h));

// how to use to avoid heap activity:
wchar[256] tmp;
wchar* wptr = toWptr(s, tmp);
...


Hope that helps.