How to make Create Window Work?

[Ruby The Roobster]

On Wednesday, 9 December 2020 at 17:42:50 UTC, Adam D. Ruppe 
wrote:
> On Wednesday, 9 December 2020 at 17:37:16 UTC, Ruby The 
> Roobster wrote:
>> It's not the 'NULL' that's the error.
>
> I know.
>
>> It doesn't compile because of the '0'
>> . That is what I need to fix, since I want to make a 
>> WM_COMMAND for that button.
>
> Use lowercase `null` instead.

I did. Still gives an error:

LRESULT WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM 
lParam) nothrow
{
     scope (failure) assert(0);

     HDC hdc;
     PAINTSTRUCT ps;
     RECT rect;

     switch (message)
     {
         case WM_CREATE:
              CreateWindow("BUTTON".toUTF16z,      // window class 
name
                          "The Hello Program",  // window caption
                          WS_CHILD | WS_VISIBLE,  // window style
                          CW_USEDEFAULT,        // initial x 
position
                          CW_USEDEFAULT,        // initial y 
position
                          250,        // initial x size
                          250,        // initial y size
                          hwnd,                 // parent window 
handle
                          0,                 // window menu handle
                          null,            // program instance 
handle
                          null);
                          return 0;
         case WM_COMMAND:
         case WM_DESTROY:
             PostQuitMessage(0);
             return 0;

         default:
     }

     return DefWindowProc(hwnd, message, wParam, lParam);
}