在执行实际请求之前检查证书指纹。 Windows C

Question

我有这段代码：

int Request(char* Method, LPCSTR Host, LPCSTR url, LPCSTR header, LPSTR data, bool ssl){
//http://msdn.microsoft.com/en-us/library/windows/desktop/aa385096%28v=vs.85%29.aspx
        HINTERNET internet = InternetOpenA("Firefox", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
        if (internet != NULL)
        {
            //http://msdn.microsoft.com/en-us/library/windows/desktop/aa384363%28v=vs.85%29.aspx
            HINTERNET connect = InternetConnectA(internet, Host, port, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
            if (connect != NULL)
            {
                //Here I want to get the certificate from the server and check the thumbprint. If it's not the want I want I don't do any request
                if(thumbprint != "49023842938429034809234"){
                    InternetCloseHandle(connect);
                    InternetCloseHandle(internet);
                    return error;
                }

                //http://msdn.microsoft.com/en-us/library/windows/desktop/aa384233%28v=vs.85%29.aspx
                HINTERNET request = HttpOpenRequestA(connect, m, url, "HTTP/1.1", NULL, NULL,
                    dwFlags, NULL);

                if (request != NULL)
                {
                    int datalen = 0;
                    if (data != NULL) datalen = strlen(data);
                    int headerlen = 0;
                    if (header != NULL) headerlen = strlen(header);

                    //http://msdn.microsoft.com/en-us/library/windows/desktop/aa384247%28v=vs.85%29.aspx
                    HttpSendRequestA(request, header, headerlen, data, datalen);

                    //http://msdn.microsoft.com/en-us/library/windows/desktop/aa384350%28v=vs.85%29.aspx
                    InternetCloseHandle(request);
                }
            }
            InternetCloseHandle(connect);
        }
        InternetCloseHandle(internet);
    }

我想查看指纹，如果服务器没有提供预期的指纹，我将关闭连接并且不启动实际请求。

我看过这篇文章，但是作者做了一个HEAD请求来获取它。 http://blogs.msdn.com/b/jpsanders/archive/2009/04/17/how-to-get-certificate-information-using-wininet-apis.aspx。在连接到服务器后，我无法获得证书详细信息吗？

谢谢