change Chrome window title text by python win32

testwin32.py

import sys
import ctypes

user32 = ctypes.windll.user32

def getClassName(hwnd):
    resultString = ctypes.create_string_buffer("\000" * 32)
    user32.GetClassNameA(hwnd, resultString, len(resultString))
    return resultString.value

def text(hwnd):
    length = user32.GetWindowTextLengthA(hwnd)
    if length:
        buffer = ctypes.create_string_buffer("",length + 1)
        if user32.GetWindowTextA(hwnd, buffer, length +1):
            return buffer.value

def proc(hwnd, user):
    if write_file == True:
        value = hwnd, text(hwnd), getClassName(hwnd)
        fo.write(str(value) + "?n")
    else:
        #if getClassName(hwnd) == "Chrome_WidgetWin_1": #search by WindowsClass name
        if text(hwnd) != None and text(hwnd)[-8:] == "- Chrome": #search by titlebar text
            print hwnd, type(text(hwnd)), text(hwnd), getClassName(hwnd)
            user32.SetWindowTextA(hwnd,ctypes.c_char_p("hoeg"))    #change titlebar text
    return 1

def run():
    WNDENUMPROC = ctypes.WINFUNCTYPE(ctypes.c_int, ctypes.c_void_p, ctypes.c_long)
    user32.EnumWindows(WNDENUMPROC(proc), 0)
    return 1

if __name__ == '__main__':
    if len(sys.argv) == 2:
        write_file = True
        fo = file(sys.argv[1]+".txt", "w")
        run()
        fo.close()
    else:
        write_file = False
        run()