我在UdpClient.BeginReceive方法中收到“远程主机强行关闭现有连接”错误 . 可能有什么问题？
这段代码在某个网络中工作，但是在某些网络中它不起作用
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Net.NetworkInformation;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Serialization.Formatters.Binary;
namespace ConsoleApplication1
{
public struct scnHeader
{
public uint signature; // 0x19141287
public ushort sequence; // unique sequence number per packet
public byte count; // retry count for the same sequence
public byte type; // packet type
public ushort length; // length of data
public byte protocol; // protocol type unique to scintilla
public byte id; // unique value per protocol to identify a packet
public byte medium; // type of medium
public byte role; // registrant role type
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public byte[] reserved1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] serialNumber;// Unique device serial number
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] reserved2;
}
public struct scnPlugModifyReq
{
public scnHeader header; // id=102, type=1(req)
public byte totalPlugs; // number of plugs returned in status
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] reserved1; // reserved
public uint plugMask; // Plug state change value
public uint plugState;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] reserved2;
}
public struct scnPlugModifyRsp
{
public scnHeader header; // id=102, type=1(req)
public byte totalPlugs; // number of plugs returned in status
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
public byte[] reserved1; // reserved
public uint plugState;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] reserved2;
}
public class UdpState
{
public UdpClient u;
public IPEndPoint e;
}
class Program
{
public static uint SwapUint(uint value)
{
return (uint)(((value & 0xFFU) << 24) | ((value >> 24) & 0xFFU)
| ((value & 0xFF00U) << 8) | ((value >> 8) & 0xFF00U));
}
public static ulong ReverseBytes2(ulong value)
{
return (value & 0x00000000000000FFUL) << 56 | (value & 0x000000000000FF00UL) << 40 |
(value & 0x0000000000FF0000UL) << 24 | (value & 0x00000000FF000000UL) << 8 |
(value & 0x000000FF00000000UL) >> 8 | (value & 0x0000FF0000000000UL) >> 24 |
(value & 0x00FF000000000000UL) >> 40 | (value & 0xFF00000000000000UL) >> 56;
}
public static ushort SwapUshort(ushort value)
{
return (ushort)(((value & 0xFFU) << 8) | ((value & 0xFF00U) >> 8));
}
public static scnPlugModifyReq tx7;
public static scnPlugModifyRsp rx7;
public static byte[] data;
public static byte[] datar;
public static Socket clientSocket;
public static byte[] getBytesfromstruct(object o)
{
int size = Marshal.SizeOf(o);
byte[] arr = new byte[size];
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(o, ptr, true);
Marshal.Copy(ptr, arr, 0, size);
Marshal.FreeHGlobal(ptr);
return arr;
}
public static object fromBytes(byte[] arr, object o)
{
object str = new object();
int size = Marshal.SizeOf(o);
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(arr, 0, ptr, size);
o = (object)Marshal.PtrToStructure(ptr, o.GetType());
Marshal.FreeHGlobal(ptr);
return o;
}
public static void prescnPlugModifyReq()
{
tx7.header.count = 0x00;
tx7.header.id = 0x65;
tx7.header.length = Program.SwapUshort((ushort)Marshal.SizeOf(tx7));
tx7.header.medium = 0x01;
tx7.header.protocol = 0x01;
tx7.header.reserved1 = new byte[] { 0x0, 0x0 };
tx7.header.reserved2 = new byte[] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
tx7.header.role = 0x03;
tx7.header.sequence = 0x0;
tx7.header.serialNumber = new byte[] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
tx7.header.signature = Program.SwapUint((uint)0x19141287);
tx7.header.type = 0x01;
tx7.totalPlugs = 0x04;
tx7.reserved1 = new byte[] { 0x0, 0x0, 0x0 };
tx7.plugMask = Program.SwapUint(0);
tx7.plugState = Program.SwapUint(0);
tx7.reserved2 = new byte[] { 0x0, 0x0, 0x0, 0x0 };
}
public static bool messageReceived;
public static IPEndPoint URJAIP;
public static IPEndPoint Sender;
public static byte[] send_buffer;
public static byte[] recv_buffer;
public static IPAddress[] UrjaDevices = new IPAddress[30];
public static string myHost = System.Net.Dns.GetHostName();
public static string myIP = Dns.GetHostByName(myHost).AddressList[0].ToString();
public static int count;
public static void sendPacket(object o, IPAddress[] addr, int port)
{
try
{
count = addr.Count(x => x != null);
byte[] send_buffer = Program.getBytesfromstruct(o);
int i = 0;
count = addr.Count(t => t != null);
here1:
messageReceived = false;
while (i < count)
{
UdpClient device = new UdpClient(addr[i].ToString(), port);
Sender = new IPEndPoint(IPAddress.Parse(myIP), 19012);
if (addr[i].ToString() == myIP)
{
i++;
continue;
};
int ret = device.Send(send_buffer, send_buffer.Length);
UdpState s = new UdpState();
s.u = device;
s.e = Sender;
device.BeginReceive(new AsyncCallback(recvPacket), s);//at this point I get exception which is have given at title
if (messageReceived == false)
{
Thread.Sleep(10);
i++;
goto here1;
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
Console.ReadLine();
}
}
public static void recvPacket(IAsyncResult ar)
{
UdpClient dev = (UdpClient)((UdpState)(ar.AsyncState)).u;
IPEndPoint sen = (IPEndPoint)((UdpState)(ar.AsyncState)).e;
Console.WriteLine("Message Received!{0}",dev.Client.RemoteEndPoint.ToString());
messageReceived = true;
}
public static void Main()
{
prescnPlugModifyReq();
byte[] data = getBytesfromstruct(tx7);
IPAddress[] temp = new IPAddress[11];
temp[0] = IPAddress.Parse("192.168.1.1");
temp[1] = IPAddress.Parse("192.168.1.100");
temp[2] = IPAddress.Parse("192.168.1.111");
temp[3] = IPAddress.Parse("192.168.1.200");
temp[4] = IPAddress.Parse("192.168.1.9");
temp[5] = IPAddress.Parse("192.168.1.10");
temp[6] = IPAddress.Parse("192.168.1.106");
temp[7] = IPAddress.Parse("192.168.1.112");
temp[8] = IPAddress.Parse("192.168.1.110");
temp[9] = IPAddress.Parse("192.168.1.109");
temp[10] = IPAddress.Parse("192.168.1.105");
sendPacket(tx7,temp,19012);
Console.ReadLine();
}
}
}