[求助]请问删除用webbrowser打开的网站的cookie

该网站的cookie为httponly的，使用InternetSetCookieEx返回1，但是实际没有删掉，具体代码如下：
        //get HTTPONLY cookie
        dwSize = 512;
        lpszData = new TCHAR[dwSize];        
retry2:
        if (!InternetGetCookieEx((LPCTSTR)strLifeNetURL, NULL, lpszData, &dwSize, INTERNET_COOKIE_HTTPONLY, NULL))
        {
            // Check for an insufficient buffer error.
            if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
            {
                if (lpszData)
                    delete[] lpszData;                
                lpszData = new TCHAR[dwSize];
                goto retry2;
            }
            else
            {
                
            }
        }
        else
        {                                   
            if (lpszData)
                delete[] lpszData;            
        }

        //delete cookie        
        nPos = 0;
        strToken = strCookie.Tokenize(_T(";"), nPos);
        while(!strToken.IsEmpty())
        {
            int nPos1 = 0;
            CString strName = strToken.Tokenize(_T("="), nPos1);
            strName = strName.Trim();
            CString strValue = strToken.Tokenize(_T("="), nPos1);

            CString strData = strValue.Trim() + _T(";path=/;expires=Sat,01-Jan-2000 00:00:00 GMT; httpOnly");
            BOOL bResult = InternetSetCookieEx((LPCTSTR)strLifeNetURL, (LPCTSTR)(strName), (LPCTSTR)strData, INTERNET_COOKIE_HTTPONLY, NULL);

 
            strToken = strCookie.Tokenize(_T(";"), nPos);
        }

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