我下载了一段代码，展示了如何使用 Python 2.7.3 解释器在 Windows 7 上使用 Windows Speech API (SAPI 5.1)，并在我的系统上安装了 PyWin32 Build 218。一切都适用于代码：
from win32com.client import constants
import win32com.client
import pythoncom
"""Sample code for using the Microsoft Speech SDK 5.1 via COM in Python.
Requires that the SDK be installed; it's a free download from
http://microsoft.com/speech
and that MakePy has been used on it (in PythonWin,
select Tools | COM MakePy Utility | Microsoft Speech Object Library 5.1).
After running this, then saying "One", "Two", "Three" or "Four" should
display "You said One" etc on the console. The recognition can be a bit
shaky at first until you've trained it (via the Speech entry in the Windows
Control Panel."""
class SpeechRecognition:
""" Initialize the speech recognition with the passed in list of words """
def __init__(self, wordsToAdd):
# For text-to-speech
self.speaker = win32com.client.Dispatch("SAPI.SpVoice")
# For speech recognition - first create a listener
self.listener = win32com.client.Dispatch("SAPI.SpSharedRecognizer")
# Then a recognition context
self.context = self.listener.CreateRecoContext()
# which has an associated grammar
self.grammar = self.context.CreateGrammar()
# Do not allow free word recognition - only command and control
# recognizing the words in the grammar only
self.grammar.DictationSetState(0)
# Create a new rule for the grammar, that is top level (so it begins
# a recognition) and dynamic (ie we can change it at runtime)
# self.wordsRule = self.grammar.Rules.Add("wordsRule",constants.SRATopLevel + constants.SRADynamic, 0)
# Clear the rule (not necessary first time, but if we're changing it
# dynamically then it's useful)
# self.wordsRule.Clear()
self.wordsRule = self.grammar.Rules.Add("wordsRule",1)
self.wordsRule.Clear()
# And go through the list of words, adding each to the rule
[ self.wordsRule.InitialState.AddWordTransition(None, word) for word in wordsToAdd ]
# Set the wordsRule to be active
self.grammar.Rules.Commit()
self.grammar.CmdSetRuleState("wordsRule", 1)
# Commit the changes to the grammar
self.grammar.Rules.Commit()
# And add an event handler that's called back when recognition occurs
self.eventHandler = ContextEvents(self.context)
# Announce we've started using speech synthesis
self.say("Started successfully")
"""Speak a word or phrase"""
def say(self, phrase):
self.speaker.Speak(phrase)
"""The callback class that handles the events raised by the speech object.
See "Automation | SpSharedRecoContext (Events)" in the MS Speech SDK
online help for documentation of the other events supported. """
class ContextEvents(win32com.client.getevents("SAPI.SpSharedRecoContext")):
"""Called when a word/phrase is successfully recognized -
ie it is found in a currently open grammar with a sufficiently high
confidence"""
def OnRecognition(self, StreamNumber, StreamPosition, RecognitionType, Result):
newResult = win32com.client.Dispatch(Result)
print "You said: ",newResult.PhraseInfo.GetText()
if __name__=='__main__':
wordsToAdd = [ "One", "Two", "Three", "Four" ]
speechReco = SpeechRecognition(wordsToAdd)
while 1:
pythoncom.PumpWaitingMessages()
但是我得到了这个异常： class ContextEvents(win32com.client.getevents("SAPI.SpSharedRecoContext")): TypeError: Error when calling the metaclass bases cannot create 'NoneType' instances
我确实在网上搜索过，我唯一想到的是： TypeError: Error when calling the metaclass bases
这没有任何帮助，所以我进行了更多搜索，并对部分代码进行了一些调查，所以我发现 win32com.client.getevents("SAPI.SpSharedRecoContext") retuens None 因此当它被用作基类时，抛出异常。
所以有什么问题？我该如何解决这个问题？否则我可以使用任何其他方式使用 SAPI 5.1 进行语音识别吗？
注意：我知道 SpeechPy 项目，但我必须使用 Windows API。
谢谢。