How to make Create Window Work?

[Ruby The Roobster via Digitalmars-d-learn]

Here is the code im using:

extern(Windows)
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);
}


This gives an error saying: Cannot pas argument of type 'int' to 
argument of type 'void*'. How is this fixed?