客户端代码：
private void ListenThreadMothed()
{
try {
IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("0.0.0.0"), 4162);
m_sListen = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
m_sListen.Bind(ipe);
IPEndPoint ipend = new IPEndPoint(IPAddress.Any, 0);
EndPoint remote = (EndPoint)ipend;
PostRecv(remote);
} catch (Exception ex) {
MsgBox(ex.Message);
}
}
private void PostRecv(EndPoint endPoint)
{
try {
byte[] buffer = new byte[6000];
m_sListen.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, endPoint, EndRecv, new AsyncState(buffer, 0, buffer.Length, endPoint));
} catch (Exception ex) {
}
}
private void EndRecv(IAsyncResult asyncResult)
{
AsyncState state = null;
byte[] sendbuf;
try {
state = (AsyncState)asyncResult.AsyncState;
PostRecv(state.EndPoint);
int readBytes = m_sListen.EndReceiveFrom(asyncResult, state.EndPoint);
string content = Encoding.Default.GetString(state.Buffer, 0, readBytes);
} catch (Exception ex) {
}
}
private void PostSend(byte[] buffer, int offset, int size, EndPoint endPoint)
{
try {
m_sListen.BeginSendTo(buffer, offset, size, SocketFlags.None, endPoint, EndSend, new AsyncState(buffer, offset, size, endPoint));
} catch (Exception ex) {
}
}
private void EndSend(IAsyncResult asyncResult)
{
try {
AsyncState state = (AsyncState)asyncResult.AsyncState;
byte[] buffer = state.Buffer;
int sendBytes = m_sListen.EndSendTo(asyncResult);
int remainBytes = state.Size - sendBytes;
if (remainBytes <= 0) {
return;
}
PostSend(buffer, buffer.Length - remainBytes, remainBytes, state.EndPoint);
} catch (Exception ex) {
}
}
[Serializable(), StructLayout(LayoutKind.Sequential)]
internal struct AsyncState
{
private readonly byte[] m_buffer;
private readonly int m_offset;
private readonly int m_size;
public AsyncState(byte[] buffer, EndPoint endPoint)
{
if (endPoint == null) {
throw new ArgumentNullException("endPoint");
}
this.m_buffer = buffer;
this.m_offset = 0;
this.m_size = buffer.Length;
this.EndPoint = endPoint;
}
public AsyncState(byte[] buffer, int offset, int size, EndPoint endPoint)
{
if (buffer == null) {
throw new ArgumentNullException("array");
}
if (offset < 0) {
throw new ArgumentOutOfRangeException("offset", "ArgumentOutOfRange_NeedNonNegNum");
}
if (size < 0) {
throw new ArgumentOutOfRangeException("count", "ArgumentOutOfRange_NeedNonNegNum");
}
if ((buffer.Length - offset) < size) {
throw new ArgumentException("Argument_InvalidOffLen");
}
if (endPoint == null) {
throw new ArgumentNullException("endPoint");
}
this.m_buffer = buffer;
this.m_offset = offset;
this.m_size = size;
this.EndPoint = endPoint;
}
public byte[] Buffer {
get { return m_buffer; }
}
public int Offset {
get { return m_offset; }
}
public int Size {
get { return m_size; }
}
public EndPoint EndPoint;
}
例如，知道这个客户端ip地址和端口为：113.21.16.5：4162
服务端的发送代码要怎么写？ 注意 ： 客户端有路由， 且 没有映射 端口
