我正在开发一个家庭安全应用程序。我想做的一件事是根据我是否在家自动关闭和打开它。我有一部带 Wifi 的手机,当我在家时,它会自动连接到我的网络。
电话通过 DHCP 连接并获取其地址。虽然我可以将其配置为使用静态 IP,但我宁愿不这样做。C#/.Net 中是否有任何类型的“Ping”或等效项可以获取设备的 MAC 地址并告诉我它当前是否在网络上处于活动状态?
编辑:澄清一下,我在 PC 上运行软件,我希望能够在同一个 LAN 上检测到手机。
编辑:这是我想出的代码,感谢 spoulson 的帮助。它可靠地检测我感兴趣的任何电话是否在房子里。
private bool PhonesInHouse()
{
Ping p = new Ping();
// My home network is 10.0.23.x, and the DHCP
// pool runs from 10.0.23.2 through 10.0.23.127.
int baseaddr = 10;
baseaddr <<= 8;
baseaddr += 0;
baseaddr <<= 8;
baseaddr += 23;
baseaddr <<= 8;
// baseaddr is now the equivalent of 10.0.23.0 as an int.
for(int i = 2; i<128; i++) {
// ping every address in the DHCP pool, in a separate thread so
// that we can do them all at once
IPAddress ip = new IPAddress(IPAddress.HostToNetworkOrder(baseaddr + i));
Thread t = new Thread(() =>
{ try { Ping p = new Ping(); p.Send(ip, 1000); } catch { } });
t.Start();
}
// Give all of the ping threads time to exit
Thread.Sleep(1000);
// We're going to parse the output of arp.exe to find out
// if any of the MACs we're interested in are online
ProcessStartInfo psi = new ProcessStartInfo();
psi.Arguments = "-a";
psi.FileName = "arp.exe";
psi.RedirectStandardOutput = true;
psi.UseShellExecute = false;
psi.CreateNoWindow = true;
bool foundone = false;
using (Process pro = Process.Start(psi))
{
using (StreamReader sr = pro.StandardOutput)
{
string s = sr.ReadLine();
while (s != null)
{
if (s.Contains("Interface") ||
s.Trim() == "" ||
s.Contains("Address"))
{
s = sr.ReadLine();
continue;
}
string[] parts = s.Split(new char[] { ' ' },
StringSplitOptions.RemoveEmptyEntries);
// config.Phones is an array of strings, each with a MAC
// address in it.
// It's up to you to format them in the same format as
// arp.exe
foreach (string mac in config.Phones)
{
if (mac.ToLower().Trim() == parts[1].Trim().ToLower())
{
try
{
Ping ping = new Ping();
PingReply pingrep = ping.Send(parts[0].Trim());
if (pingrep.Status == IPStatus.Success)
{
foundone = true;
}
}
catch { }
break;
}
}
s = sr.ReadLine();
}
}
}
return foundone;
}