elif system_name == 'Darwin':
    from ctypes import CFUNCTYPE, cdll
    FUNCTYPE = CFUNCTYPE
    vk = cdll.LoadLibrary('libvulkan.dylib')

elif system_name == 'Darwin':
    from macos import MacOSWindow as Window, MacOSSwapchain as BaseSwapchain

        elif system_name == 'Darwin':
            extensions = [b'VK_KHR_surface', b'VK_MVK_macos_surface']

import vk
import glfw

from ctypes import *
import weakref
import asyncio

class MacOSWindow(object):
    
    def __init__(self, app):
        self.width = 1280
        self.height = 720
        self.window = None
        self.app = weakref.ref(app)

        glfw.init()
        
        glfw.window_hint(glfw.CLIENT_API, glfw.NO_API)
        glfw.window_hint(glfw.VISIBLE, False)           #hidden

        self.window = glfw.create_window(self.width, self.height, 
            "Python vulkan test", None, None)

        # asyncio.ensure_future(process_events(self.app))    

    def __del__(self):
        glfw.terminate()
        

    @property
    def handle(self):
        return self.window
        # return self.__hwnd

    def dimensions(self):
        return (self.width, self.height)
        # dim = RECT()
        # GetClientRect(self.__hwnd, byref(dim))
        # return (dim.right, dim.bottom)

    def show(self):
        glfw.show_window(self.window)
        # ShowWindow(self.__hwnd, SW_SHOWNORMAL)

    def set_title(self, title):
        glfw.set_window_title(self.window, title)

        # glfwSetWindowTitle(window, "My Window");

        # title = c_wchar_p(title)
        # SetWindowTextW(self.__hwnd, title)


class MacOSSwapchain(object):

    def __init__(self, app):
        self.app = weakref.ref(app)
        self.surface = None
        self.swapchain = None
        self.images = None
        self.views = None
        self.create_surface()

    def create_surface(self):
        """
            Create a surface for the window
        """
        
        app = self.app()    #think this paren is because of weakref

        surface = c_void_p(0)

        glfw.create_window_surface(
            instance = app.instance,
            window = app.window.handle, 
            allocator = None,
            surface = byref( surface ) 
        )

        self.surface = surface

Traceback (most recent call last):
  File ".\triangle.py", line 1693, in <module>
    main()
  File ".\triangle.py", line 1686, in main
    app = TriangleApplication()
  File ".\triangle.py", line 1626, in __init__
    Application.__init__(self)
  File ".\triangle.py", line 832, in __init__
    self.create_instance()
  File ".\triangle.py", line 291, in create_instance
    raise RuntimeError('Instance creation failed. Error code: {}'.format(result))
RuntimeError: Instance creation failed. Error code: 4294967289

Traceback (most recent call last):
  File ".\triangle.py", line 1693, in <module>
    main()
  File ".\triangle.py", line 1686, in main
    app = TriangleApplication()
  File ".\triangle.py", line 1626, in __init__
    Application.__init__(self)
  File ".\triangle.py", line 832, in __init__
    self.create_instance()
  File ".\triangle.py", line 276, in create_instance
    result = vk.CreateInstance(byref(create_info), None, byref(instance))
OSError: exception: access violation reading 0x0000000200000001