Looking for a little help with the win32 headers

[Rikki Cattermole via Digitalmars-d-learn]

On 26/03/2015 5:52 p.m., Belly wrote:
> Hello, just installed D today. I have this code:
>
> import std.stdio;
> import win32.windef;
> import win32.winbase;
>
> void main()
> {
>      LPSTR lpBuffer;
>      PDWORD lpnSize;
>      int result = GetComputerNameA(lpBuffer, lpnSize);
>
>      writeln(result);
> }
>
> It passes zeroes to the API, I'm stuck and can't find a suitable sample
> in the win32 repository here:
> https://github.com/AndrejMitrovic/DWinProgramming

According to MSDN you need to preallocate the buffer.

import std.stdio;
import win32.windef;
import win32.winbase;

void main() {
	char[] buffer;
	buffer.length = MAX_COMPUTERNAME_LENGTH + 1;
	size_t size = MAX_COMPUTERNAME_LENGTH;

	int result = GetComputerNameA(buffer.ptr, &size);

	writeln(buffer[0 .. size]);
}

I haven't tested it. But I think that should work.
Also I think writeln will be outputting with a null terminator. So may 
need to -1 it.

https://msdn.microsoft.com/en-us/library/windows/desktop/ms724295%28v=vs.85%29.aspx