WinHttpGetProxyForUrlの使用 (ID：102711)

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ホームページ(ブログ、Twitterなど)のURL (省略可)

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VB6(SP6)でWinHttpGetProxyForUrlを使いたいのですが、パラメータエラーが出てしまいます。
いろいろ調べているのですが現状エラーを修正できません。
どのように修正すべきか御教授いただけますでしょうか

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Private Const WINHTTP_ACCESS_TYPE_DEFAULT_PROXY = 0
Private Const WINHTTP_NO_PROXY_NAME = 0
Private Const WINHTTP_NO_PROXY_BYPASS = 0
Private Const WINHTTP_FLAG_ASYNC = &H10000000
Private Const WINHTTP_AUTOPROXY_CONFIG_URL = &H2

Private Declare Function WinHttpOpen Lib "winhttp.dll" _
    (ByVal pwszUserAgent As String, _
     ByVal dwAccessType As Long, _
     ByVal pwszProxyName As String, _
     ByVal pwszProxyBypass As String, _
     ByVal dwFlags As Long) As Long

Private Type WINHTTP_AUTOPROXY_OPTIONS
    dwFlags                 As Long
    dwAutoDetectFlags       As Long
    lpszAutoConfigUrl       As String
    lpvReserved             As Long
    dwReserved              As Long
    fAutoLogonIfChallenged  As Long
End Type

Private Type WINHTTP_PROXY_INFO
    dwAccessType            As Long
    lpszProxy               As Long
    lpszProxyBypass         As Long
End Type

Private Declare Function WinHttpGetProxyForUrl Lib "winhttp.dll" _
    (ByVal hSession As Long, _
     ByVal lpcwszUrl As String, _
     ByRef autoproxyOptions As WINHTTP_AUTOPROXY_OPTIONS, _
     ByRef proxyInfo As WINHTTP_PROXY_INFO) As Boolean

Dim session As Long
session = WinHttpOpen(0, WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, WINHTTP_FLAG_ASYNC)

Dim autoproxyOptions As WINHTTP_AUTOPROXY_OPTIONS
autoproxyOptions.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL
autoproxyOptions.dwAutoDetectFlags = 0
autoproxyOptions.lpszAutoConfigUrl = ""
autoproxyOptions.lpvReserved = 0
autoproxyOptions.dwReserved = 0
autoproxyOptions.fAutoLogonIfChallenged = 0

Dim proxyInfo As WINHTTP_PROXY_INFO
proxyInfo.dwAccessType = 0
proxyInfo.lpszProxy = 0
proxyInfo.lpszProxyBypass = 0

WinHttpGetProxyForUrl(session, "http://www.yahoo.co.jp/", autoproxyOptions, proxyInfo)
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WinHttpOpenはうまくいきますが、WinHttpGetProxyForUrlでは
Err.LastDllErrorの値が87で「パラメータが間違っています。」になります。
よろしくお願いします。

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