How to use the azure-servicemanagement-legacy.azure.servicemanagement._http.winhttp.VARIANT function in azure-servicemanagement-legacy

def create_bool_false():
        variant = VARIANT()
        variant.vt = VT_BOOL
        variant.vdata.boolval = 0
        return variant

_CLSIDFromString(unicode(name), byref(self))


class _WinHttpRequest(c_void_p):

    '''
    Maps the Com API to Python class functions. Not all methods in
    IWinHttpWebRequest are mapped - only the methods we use.
    '''
    _AddRef = WINFUNCTYPE(c_long) \
        (1, 'AddRef')
    _Release = WINFUNCTYPE(c_long) \
        (2, 'Release')
    _SetProxy = WINFUNCTYPE(HRESULT,
                            HTTPREQUEST_PROXY_SETTING,
                            VARIANT,
                            VARIANT) \
        (7, 'SetProxy')
    _SetCredentials = WINFUNCTYPE(HRESULT,
                                  BSTR,
                                  BSTR,
                                  HTTPREQUEST_SETCREDENTIALS_FLAGS) \
        (8, 'SetCredentials')
    _Open = WINFUNCTYPE(HRESULT, BSTR, BSTR, VARIANT) \
        (9, 'Open')
    _SetRequestHeader = WINFUNCTYPE(HRESULT, BSTR, BSTR) \
        (10, 'SetRequestHeader')
    _GetResponseHeader = WINFUNCTYPE(HRESULT, BSTR, POINTER(c_void_p)) \
        (11, 'GetResponseHeader')
    _GetAllResponseHeaders = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (12, 'GetAllResponseHeaders')
    _Send = WINFUNCTYPE(HRESULT, VARIANT) \

def create_empty():
        variant = VARIANT()
        variant.vt = VT_EMPTY
        variant.vdata.llval = 0
        return variant

(11, 'GetResponseHeader')
    _GetAllResponseHeaders = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (12, 'GetAllResponseHeaders')
    _Send = WINFUNCTYPE(HRESULT, VARIANT) \
        (13, 'Send')
    _Status = WINFUNCTYPE(HRESULT, POINTER(c_long)) \
        (14, 'Status')
    _StatusText = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (15, 'StatusText')
    _ResponseText = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (16, 'ResponseText')
    _ResponseBody = WINFUNCTYPE(HRESULT, POINTER(VARIANT)) \
        (17, 'ResponseBody')
    _ResponseStream = WINFUNCTYPE(HRESULT, POINTER(VARIANT)) \
        (18, 'ResponseStream')
    _WaitForResponse = WINFUNCTYPE(HRESULT, VARIANT, POINTER(c_ushort)) \
        (21, 'WaitForResponse')
    _Abort = WINFUNCTYPE(HRESULT) \
        (22, 'Abort')
    _SetTimeouts = WINFUNCTYPE(HRESULT, c_long, c_long, c_long, c_long) \
        (23, 'SetTimeouts')
    _SetClientCertificate = WINFUNCTYPE(HRESULT, BSTR) \
        (24, 'SetClientCertificate')

    def open(self, method, url):
        '''
        Opens the request.

        method:
            the request VERB 'GET', 'POST', etc.
        url:
            the url to connect

'''
    _AddRef = WINFUNCTYPE(c_long) \
        (1, 'AddRef')
    _Release = WINFUNCTYPE(c_long) \
        (2, 'Release')
    _SetProxy = WINFUNCTYPE(HRESULT,
                            HTTPREQUEST_PROXY_SETTING,
                            VARIANT,
                            VARIANT) \
        (7, 'SetProxy')
    _SetCredentials = WINFUNCTYPE(HRESULT,
                                  BSTR,
                                  BSTR,
                                  HTTPREQUEST_SETCREDENTIALS_FLAGS) \
        (8, 'SetCredentials')
    _Open = WINFUNCTYPE(HRESULT, BSTR, BSTR, VARIANT) \
        (9, 'Open')
    _SetRequestHeader = WINFUNCTYPE(HRESULT, BSTR, BSTR) \
        (10, 'SetRequestHeader')
    _GetResponseHeader = WINFUNCTYPE(HRESULT, BSTR, POINTER(c_void_p)) \
        (11, 'GetResponseHeader')
    _GetAllResponseHeaders = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (12, 'GetAllResponseHeaders')
    _Send = WINFUNCTYPE(HRESULT, VARIANT) \
        (13, 'Send')
    _Status = WINFUNCTYPE(HRESULT, POINTER(c_long)) \
        (14, 'Status')
    _StatusText = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (15, 'StatusText')
    _ResponseText = WINFUNCTYPE(HRESULT, POINTER(c_void_p)) \
        (16, 'ResponseText')
    _ResponseBody = WINFUNCTYPE(HRESULT, POINTER(VARIANT)) \

def create_safearray_from_str(text):
        variant = VARIANT()
        variant.vt = VT_ARRAY | VT_UI1

        length = len(text)
        variant.vdata.parray = _SafeArrayCreateVector(VT_UI1, 0, length)
        pvdata = c_void_p()
        _SafeArrayAccessData(variant.vdata.parray, byref(pvdata))
        ctypes.memmove(pvdata, text, length)
        _SafeArrayUnaccessData(variant.vdata.parray)

        return variant

def send(self, request=None):
        ''' Sends the request body. '''

        # Sends VT_EMPTY if it is GET, HEAD request.
        if request is None:
            var_empty = VARIANT.create_empty()
            _WinHttpRequest._Send(self, var_empty)
        else:  # Sends request body as SAFEArray.
            _request = VARIANT.create_safearray_from_str(request)
            _WinHttpRequest._Send(self, _request)

def set_tunnel(self, host, port):
        ''' Sets up the host and the port for the HTTP CONNECT Tunnelling.'''
        url = host
        if port:
            url = url + u':' + port

        var_host = VARIANT.create_bstr_from_str(url)
        var_empty = VARIANT.create_empty()

        _WinHttpRequest._SetProxy(
            self, HTTPREQUEST_PROXYSETTING_PROXY, var_host, var_empty)

def set_tunnel(self, host, port):
        ''' Sets up the host and the port for the HTTP CONNECT Tunnelling.'''
        url = host
        if port:
            url = url + u':' + port

        var_host = VARIANT.create_bstr_from_str(url)
        var_empty = VARIANT.create_empty()

        _WinHttpRequest._SetProxy(
            self, HTTPREQUEST_PROXYSETTING_PROXY, var_host, var_empty)

def response_body(self):
        '''
        Gets response body as a SAFEARRAY and converts the SAFEARRAY to str.
        '''
        var_respbody = VARIANT()
        _WinHttpRequest._ResponseBody(self, byref(var_respbody))
        if var_respbody.is_safearray_of_bytes():
            respbody = var_respbody.str_from_safearray()
            return respbody
        else:
            return ''