源网址http://bbs.csdn.net/topics/390830518
class Program
{
[DllImport(@"wininet", SetLastError = true, CharSet = CharSet.Auto,
EntryPoint = "InternetSetOption",
CallingConvention = CallingConvention.StdCall)]
public static extern bool InternetSetOption(
int hInternet, int dmOption, IntPtr lpBuffer, int dwBufferLength);
public static void SetProxy(string proxy)
{
//打开注册表
RegistryKey regKey = Registry.CurrentUser;
string SubKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings"; RegistryKey optionKey = regKey.OpenSubKey(SubKeyPath, true); //更改健值,设置代理,
optionKey.SetValue("ProxyEnable", 1);
optionKey.SetValue("ProxyServer", proxy);
//激活代理设置【用于即使IE没有关闭也能更新当前打开的IE中的代理设置。】
InternetSetOption(0, 39, IntPtr.Zero, 0);
InternetSetOption(0, 37, IntPtr.Zero, 0);
}
static void Main(string[] args)
{
//本事例中未对代理服务器设置密码的情况进行尝试
String ip = null;
for (int i = 1; i < 254; i++)
{
ip = "172.0.0." + i + ":808";//ip请替换为你需要查找的ip段
SetProxy(ip);
if (prcessBaidu())
{
Console.WriteLine(ip + "_____________TestOK"); break;
}
else
{
Console.WriteLine(ip + "__false");
}
}
}
//成功返回true,错误返回false
public static Boolean prcessBaidu()
{
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://www.163.com"); myRequest.Method = "POST"; //采用post方式提交访问163主页 // Get response
try//当无法访问163网站时,下面的对象会有错误产生,所以用try..catch处理掉这些异常
{
Stream newStream = myRequest.GetRequestStream();//获取请求流 // Send the data.
newStream.Close();//关闭请求流
HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();//获取应答对象
StreamReader reader = new StreamReader(myResponse.GetResponseStream());//获取应答流
string content = reader.ReadToEnd();//将流对象读取到string 中
if (content.IndexOf("http://reg.163.com") > -1)//如果访问网站成功,则网页中包含置顶的关键字符串“http://reg.163.com”表示访问网页成功
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
}
return false;
}
}