import win32con
from win32con import WM_INPUTLANGCHANGEREQUEST
import win32gui
import win32api
def setKeyboardLayout_en(inner):
  def wrapper(*args, **kwargs):
    if win32api.LoadKeyboardLayout('0x0409', win32con.KLF_ACTIVATE) == None:
      return Exception('加载键盘失败')
    # 语言代码
    # https://msdn.microsoft.com/en-us/library/cc233982.aspx
    LID = {0x0804: "Chinese (Simplified) (People's Republic of China)",
        0x0409: 'English (United States)'}
 
    # 获取前景窗口句柄
    hwnd = win32gui.GetForegroundWindow()
 
    # 获取前景窗口标题
    title = win32gui.GetWindowText(hwnd)
    # 获取键盘布局列表
    im_list = win32api.GetKeyboardLayoutList()
    im_list = list(map(hex, im_list))
    print(im_list)
    oldKey = hex(win32api.GetKeyboardLayout())
 
    # 设置键盘布局为英文
    result = win32api.SendMessage(
      hwnd,
      WM_INPUTLANGCHANGEREQUEST,
      0,
      0x4090409)
    if result == 0:
      print('设置英文键盘成功！')
    inner(*args,*kwargs)
    result = win32api.SendMessage(
      hwnd,
      WM_INPUTLANGCHANGEREQUEST,
      0,
      oldKey)
    if result == 0:
      print('还原键盘成功！')
  return wrapper