D2 string conversion

[Sam Hu]

Hello,

In D2 I tried to write a simple function which wrapps WIN32 API MessageBoxW,with which I can handle wide characters like Chinese .Below is my try:

import std.string;
import std.conv;
import std.c.windows.windows;

extern(Windows)int MessageBoxW(HWND,LPCSTR,LPCSTR,int);
int showMessage(wchar[] msg,wchar[ ] caption=cast(wchar[])"Application",int style=MB_OK|MB_ICONINFORMATION)
{
return MessageBoxW(null,to!(const(char)[])(msg),to!(const(char)[])(caption),style);//try one
return MessageBoxW(null,toStringz(to!(const(char[])(msg)),toStringz(to!(const(char)[])(caption)),style);//try two
}

But both *try one* and *try two* the above are wrong.Anyone can figure me out what's the problem and what's the right way to do would be appreciated.

Sam