我在 iOS 上使用 Xamarin + MonoTouch 浏览网络上的 Web 服务器,然后我可以从中下载文件。
传递给解析事件处理程序的 NSNetService 包含作为 NSData 的地址。我找不到将 NSData 转换为实际 IP 地址的好方法,然后我可以从中构建 URL,即 http://< IPAddress >/folder/file.htm
这是我的 NSNetService.AddressResolved 事件处理程序:
private void OnServiceResolved(object sender, EventArgs args)
{
NSNetService service = (NSNetService)sender;
// service.Port is valid.
// service.HostName is valid.
// but we want the IP addres, which is in service.Addresses.
// None of the following four methods works quite right.
IPAddress address = (IPAddress)service.Addresses [0]; // Cannot convert type NSData to IPAddress
SocketAddress address2 = (SocketAddress)service.Addresses[0]; // Cannot convert NSData to SocketAddress. A binary copy might work?
IPHostEntry entry = (IPHostEntry)service.Addresses [0]; // Cannot convert NSData to IPHostEntry
IPHostEntry entry2 = Dns.GetHostByName (service.HostName); // This kinda works, but is dumb. Didn't we just resolve?
}
在解析事件中从 NSNetService 获取服务的 IP 地址的正确方法是什么?
最佳答案
NSNetService.Addresses
属性为您提供了 NSData
实例,必须将其转换为 IPAddress
(或其他 .NET 类型)可以消化的内容.例如
MemoryStream ms = new MemoryStream ();
(ns.Addresses [0] as NSData).AsStream ().CopyTo (ms);
IPAddress ip = new IPAddress (ms.ToArray ());
请注意,这可以返回一个 IPv6 地址(或 IPAddress
不接受的格式)。您可能希望遍历所有 Addresses
以找到最佳地址。
我将考虑在 Xamarin.iOS 的 future 版本中添加一种便捷方法。
更新
一个更完整的版本,返回一个 IPAddress
,看起来像:
static IPAddress CreateFrom (NSData data)
{
byte[] address = null;
using (MemoryStream ms = new MemoryStream ()) {
data.AsStream ().CopyTo (ms);
address = ms.ToArray ();
}
SocketAddress sa = new SocketAddress (AddressFamily.InterNetwork, address.Length);
// do not overwrite the AddressFamily we provided
for (int i = 2; i < address.Length; i++)
sa [i] = address [i];
IPEndPoint ep = new IPEndPoint (IPAddress.Any, 0);
return (ep.Create (sa) as IPEndPoint).Address;
}
关于c# - 在 MonoTouch 中使用 Bonjour NSNetService 来自 NSData 的 IP 地址?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21743679/