C# 从 Internet Explorer 获取代理设置
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C# Getting proxy settings from Internet Explorer
提问by Kaminari
i have a problem in certain company in germany. They use proxy in their network and my program cant communicate with server.
我在德国的某家公司遇到了问题。他们在他们的网络中使用代理，我的程序无法与服务器通信。
IE works with this settings:
IE 使用此设置：
It means: Automatically detect settings
意思是：自动检测设置
This is the code:
这是代码：
public static bool CompleteValidation(string regKey)
{
string uri = "***";
int c = 1;
if (Counter < 5) c = 6 - Counter;
string response = "";
try
{
System.Net.ServicePointManager.Expect100Continue = false;
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.AllowWriteStreamBuffering = true;
request.Method = "POST";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0";
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
request.Headers.Add(HttpRequestHeader.AcceptLanguage, "pl,en-us;q=0.7,en;q=0.3");
request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
request.Headers.Add(HttpRequestHeader.AcceptCharset, "ISO-8859-2,utf-8;q=0.7,*;q=0.7");
request.KeepAlive = true;
//proxy settings
string exepath = Path.GetDirectoryName(Application.ExecutablePath);
string proxySettings = exepath + @"\proxy.ini";
WebProxy wp = new WebProxy();
if (File.Exists(proxySettings)) {
request.Proxy = WebRequest.DefaultWebProxy;
IniFile ini = new IniFile(proxySettings);
string user = ini.IniReadValue("Proxy", "User");
string pass = ini.IniReadValue("Proxy", "Password");
string domain = ini.IniReadValue("Proxy", "Domain");
string ip = ini.IniReadValue("Proxy", "IP");
string port_s = ini.IniReadValue("Proxy", "Port");
int port = 0;
if (!string.IsNullOrEmpty(ip))
{
if (!string.IsNullOrEmpty(port_s))
{
try
{
port = Convert.ToInt32(port_s);
}
catch (Exception e)
{
ErrorLog.AddToLog("Problem with conversion of port:");
ErrorLog.AddToLog(e.Message);
ErrorLog.ShowLogWindow();
}
wp = new WebProxy(ip, port);
} else {
wp = new WebProxy(ip);
}
}
if (string.IsNullOrEmpty(domain))
wp.Credentials = new NetworkCredential(user, pass);
else
wp.Credentials = new NetworkCredential(user, pass, domain);
request.Proxy = wp;
}
string post = "***";
request.ContentLength = post.Length;
request.ContentType = "application/x-www-form-urlencoded";
StreamWriter writer = null;
try
{
writer = new StreamWriter(request.GetRequestStream()); // Here is the WebException thrown
writer.Write(post);
writer.Close();
}
catch (Exception e)
{
ErrorLog.AddToLog("Problem with request sending:");
ErrorLog.AddToLog(e.Message);
ErrorLog.ShowLogWindow();
}
HttpWebResponse Response = null;
try
{
Response = (HttpWebResponse)request.GetResponse();
}
catch (Exception e)
{
ErrorLog.AddToLog("Problem with response:");
ErrorLog.AddToLog(e.Message);
ErrorLog.ShowLogWindow();
}
//Request.Proxy = WebProxy.GetDefaultProxy();
//Request.Proxy.Credentials = CredentialCache.DefaultCredentials;
string sResponseHeader = Response.ContentEncoding; // get response header
if (!string.IsNullOrEmpty(sResponseHeader))
{
if (sResponseHeader.ToLower().Contains("gzip"))
{
byte[] b = DecompressGzip(Response.GetResponseStream());
response = System.Text.Encoding.GetEncoding(Response.ContentEncoding).GetString(b);
}
else if (sResponseHeader.ToLower().Contains("deflate"))
{
byte[] b = DecompressDeflate(Response.GetResponseStream());
response = System.Text.Encoding.GetEncoding(Response.ContentEncoding).GetString(b);
}
}
// uncompressed, standard response
else
{
StreamReader ResponseReader = new StreamReader(Response.GetResponseStream());
response = ResponseReader.ReadToEnd();
ResponseReader.Close();
}
}
catch (Exception e)
{
ErrorLog.AddToLog("Problem with comunication:");
ErrorLog.AddToLog(e.Message);
ErrorLog.ShowLogWindow();
}
if (response == "***")
{
SaveKeyFiles();
WriteRegKey(regKey);
RenewCounter();
return true;
}
else
{
return false;
}
}
My program logs it as:
我的程序将其记录为：
[09:13:18] Searching for hardware ID
[09:13:56] Problem with response:
[09:13:56] The remote server returned an error: (407) Proxy Authentication Required.
[09:15:04] problem with comunication:
[09:15:04] Object reference not set to an object instance.
If they write user and pass into proxy.ini file, program works. But the problem is they cant do that. And somehow IE works without it. Is there any way to get those settings from IE or system?
如果他们写入用户并传递到 proxy.ini 文件，程序就可以工作。但问题是他们不能那样做。不知何故，IE 没有它也能工作。有没有办法从 IE 或系统获取这些设置？
采纳答案by mattypiper
Use GetSystemWebProxyto return what the system default proxy is.
使用GetSystemWebProxy返回系统默认代理是什么。
WebRequest.DefaultProxy = WebRequest.GetSystemWebProxy();
But every HttpWebRequestshould automatically be filled out with this information by default. For example, the following snippet in a standalone console application should print the correct information on a system with a PAC file configured.
但默认情况下，每个HttpWebRequest都应该自动填写此信息。例如，独立控制台应用程序中的以下代码段应该在配置了 PAC 文件的系统上打印正确的信息。
HttpWebRequest myWebRequest=(HttpWebRequest)WebRequest.Create("http://www.microsoft.com");
// Obtain the 'Proxy' of the Default browser.
IWebProxy proxy = myWebRequest.Proxy;
// Print the Proxy Url to the console.
if (proxy != null)
{
Console.WriteLine("Proxy: {0}", proxy.GetProxy(myWebRequest.RequestUri));
}
else
{
Console.WriteLine("Proxy is null; no proxy will be used");
}
回答by Yuriy
Use DefaultNetworkCredentialsto return system proxy credentials.
使用DefaultNetworkCredentials返回系统代理凭据。
request.Proxy.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
