2.067 should modify writeln function, make it display correctly unicode characters in CMD. Exe

[FrankLike via Digitalmars-d]

Many people want to display their string(unicode),but always to 
convert string by 'toMBSz',and it can't convert to immutable 
char[],it's difficult to display their unicode string in CMD.EXE.
  Now,I find a function,if add it in 'writeln' function,D will 
very be popular!

string toMBS(string s, uint codePage = 0)
{
		// Only need to do this if any chars have the high bit set
	foreach (char c; s)
	{
		if (c >= 0x80)
		{
			char[] result;
			int readLen;
			const wchar* ws = std.utf.toUTF16z(s);
			result.length = WideCharToMultiByte(codePage, 0, ws, -1, null, 
0,null, null);

			if (result.length)
			{
				readLen = WideCharToMultiByte(codePage, 0, ws, -1, 
result.ptr,result.length, null, null);
			}

			if (!readLen || readLen != result.length)
			{
				throw new Exception("Couldn't convert string: " ~ 
sysErrorString(GetLastError()));
			}

			return cast(string)result[0..$-1];
		}
	}
	return s;
}

Now ,I use it :

string toStr(string s)
{
    return toMBS(s,0);
}
writeln(toStr("中文"));// chcp: 936

So difficult！

What do you think？