Win32 CreateWindow example in python

winapp.py

from ctypes import *
from ctypes.wintypes import *


WNDPROCTYPE = WINFUNCTYPE(c_int, HWND, c_uint, WPARAM, LPARAM)

WS_EX_APPWINDOW = 0x40000
WS_OVERLAPPEDWINDOW = 0xcf0000
WS_CAPTION = 0xc00000

SW_SHOWNORMAL = 1
SW_SHOW = 5

CS_HREDRAW = 2
CS_VREDRAW = 1

CW_USEDEFAULT = 0x80000000

WM_DESTROY = 2

WHITE_BRUSH = 0


class WNDCLASSEX(Structure):
    _fields_ = [("cbSize", c_uint),
                ("style", c_uint),
                ("lpfnWndProc", WNDPROCTYPE),
                ("cbClsExtra", c_int),
                ("cbWndExtra", c_int),
                ("hInstance", HANDLE),
                ("hIcon", HANDLE),
                ("hCursor", HANDLE),
                ("hBrush", HANDLE),
                ("lpszMenuName", LPCWSTR),
                ("lpszClassName", LPCWSTR),
                ("hIconSm", HANDLE)]

def PyWndProcedure(hWnd, Msg, wParam, lParam):
    if Msg == WM_DESTROY:
        windll.user32.PostQuitMessage(0)
    else:
        return windll.user32.DefWindowProcW(hWnd, Msg, wParam, lParam)
    return 0
  


def main():
	WndProc = WNDPROCTYPE(PyWndProcedure)
	hInst = windll.kernel32.GetModuleHandleW(0)
	wclassName = 'My Python Win32 Class'
	wname = 'My test window'
	
	wndClass = WNDCLASSEX()
	wndClass.cbSize = sizeof(WNDCLASSEX)
	wndClass.style = CS_HREDRAW | CS_VREDRAW
	wndClass.lpfnWndProc = WndProc
	wndClass.cbClsExtra = 0
	wndClass.cbWndExtra = 0
	wndClass.hInstance = hInst
	wndClass.hIcon = 0
	wndClass.hCursor = 0
	wndClass.hBrush = windll.gdi32.GetStockObject(WHITE_BRUSH)
	wndClass.lpszMenuName = 0
	wndClass.lpszClassName = wclassName
	wndClass.hIconSm = 0
	
	regRes = windll.user32.RegisterClassExW(byref(wndClass))
	
	hWnd = windll.user32.CreateWindowExA(
    0,wclassName,wname,
    WS_OVERLAPPEDWINDOW | WS_CAPTION,
    CW_USEDEFAULT, CW_USEDEFAULT,
    300,300,0,0,hInst,0)
	
	if not hWnd:
		print('Failed to create window')
		exit(0)
	print('ShowWindow', windll.user32.ShowWindow(hWnd, SW_SHOW))
	print('UpdateWindow', windll.user32.UpdateWindow(hWnd))

	msg = MSG()
	lpmsg = pointer(msg)

	print('Entering message loop')
	while windll.user32.GetMessageA(lpmsg, 0, 0, 0) != 0:
		windll.user32.TranslateMessage(lpmsg)
		windll.user32.DispatchMessageA(lpmsg)

	print('done.')
	
	
if __name__ == "__main__":
	print "Win32 Application in python"
	main()

For me it works on Python 2.7 but not on Python 3.4, all 32 bit. "CreateWindowExA" returns 0 on Python 3.4.
Edit:
It's related to the Python string format.
Using "RegisterClassExA" and "CreateWindowExA" works on Python 3.4 with broken window title but not on 2.7.
Using "RegisterClassExW" and "CreateWindowExW" works on Python 3.4 with correct window title but not on 2.7., but with "wclassName" and "wname" strings prefixed with 'u' (u'My Python Win32 Class') it works for both properly.

A great code! It can be worked on my side, and i want to know how I can create a window without a title bar? Any help will be appreciated.

To make the code work, just add this line to the top of the file:
windll.user32.DefWindowProcW.argtypes = HWND, UINT, WPARAM, LPARAM