Python: win32com.client.getevents ("SAPI.SpSharedRecoContext") 返回 None

Question

我已经下载了一段代码，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。代码一切都很好:

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:类 ContextEvents(win32com.client.getevents("SAPI.SpSharedRecoContext")):TypeError:调用元类基时出错无法创建“NoneType”实例

我在网上搜索了一下，我唯一想到的是: TypeError: Error when calling the metaclass bases

这没有帮助，所以我搜索了更多，并对部分代码做了一些调查，所以我发现 win32com.client.getevents("SAPI.SpSharedRecoContext") retuens None ，因此当它被用作基础时类，该异常被抛出。

那么，问题出在哪里呢？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。

Answer 1

您忘记运行 MakePy。
如果您安装了 pyWin32，它也会安装 PythonWin。

打开PythonWin，然后选择工具| COM MakePy 实用程序 |微软语音对象库5.4