policy.py 文件源码

def CreateInstance(clsid, reqIID):
  """Create a new instance of the specified IID

  The COM framework **always** calls this function to create a new 
  instance for the specified CLSID.  This function looks up the
  registry for the name of a policy, creates the policy, and asks the
  policy to create the specified object by calling the _CreateInstance_ method.

  Exactly how the policy creates the instance is up to the policy.  See the
  specific policy documentation for more details.
  """
  # First see is sys.path should have something on it.
  try:
    addnPaths = win32api.RegQueryValue(win32con.HKEY_CLASSES_ROOT,
                                      regAddnPath % clsid).split(';')
    for newPath in addnPaths:
      if newPath not in sys.path:
        sys.path.insert(0, newPath)
  except win32api.error:
    pass
  try:
    policy = win32api.RegQueryValue(win32con.HKEY_CLASSES_ROOT,
                                      regPolicy % clsid)
    policy = resolve_func(policy)
  except win32api.error:
    policy = DefaultPolicy

  try:
    dispatcher = win32api.RegQueryValue(win32con.HKEY_CLASSES_ROOT,
                                      regDispatcher % clsid)
    if dispatcher: dispatcher = resolve_func(dispatcher)
  except win32api.error:
    dispatcher = None

  if dispatcher:
    retObj = dispatcher(policy, None)
  else:
    retObj = policy(None)
  return retObj._CreateInstance_(clsid, reqIID)