How to make Create Window Work?

[Ruby The Roobster]

On Wednesday, 9 December 2020 at 17:32:57 UTC, Adam D. Ruppe 
wrote:
> On Wednesday, 9 December 2020 at 17:25:10 UTC, Ruby The 
> Roobster wrote:
>>              CreateWindow("BUTTON".toUTF16z,      // window 
>> class name
>
> fyi for a string literal like this you can just do
>
> "BUTTON"w.ptr // note the w
>
>> This gives an error saying: Cannot pas argument of type 'int' 
>> to argument of type 'void*'. How is this fixed?
>
> Use lowercase `null` instead.

It's not the 'NULL' that's the error. 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.