/// <summary>
/// 侦听到客户端数据回调his the call back function which will be invoked when the socket
/// detects any client writing of data on the stream
/// </summary>
/// <param name="asyn"></param>
private void ReadCallBack(IAsyncResult asyn)
{
SocketPacket socketData = (SocketPacket)asyn.AsyncState;
try
{
// Complete the BeginReceive() asynchronous call by EndReceive() method
// which will return the number of characters written to the stream
// by the client
int iRx = socketData.m_currentSocket.EndReceive(asyn);
char[] chars = new char[iRx + 1];
// Extract the characters as a buffer
System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
int charLen = d.GetChars(socketData.dataBuffer, 0, iRx, chars, 0);
System.String szData = new System.String(chars);
// 构造事件
ItemValueResult[] values = new ItemValueResult[1];
values[0] = new ItemValueResult();
values[0].Value = socketData.dataBuffer;
values[0].ItemName = "MODBUS Server:" + socketData.m_currentSocket.LocalEndPoint.ToString();
base.OnDataChange(null, null, values);
// Send back the reply to the client
string replyMsg = "Server Reply:" + szData.ToUpper();
// Convert the reply to byte array
byte[] byData = System.Text.Encoding.ASCII.GetBytes(replyMsg);
Socket workerSocket = (Socket)socketData.m_currentSocket;
workerSocket.Send(byData);
// Continue the waiting for data on the Socket
WaitForData(socketData.m_currentSocket, socketData.m_clientNumber);
}
catch (ObjectDisposedException ex)
{
System.Diagnostics.Debugger.Log(0, "1", "\nOnDataReceived: Socket has been closed\n");
CLOGException.Trace("函数CommunicationLib.CTcpServerAccess.ReadCallBack 异常", CBaseMethods.MyBase.GetExceptionInfo(ex));
}
catch (SocketException ex)
{
if (ex.ErrorCode == 10054) // Error code for Connection reset by peer
{
// Remove the reference to the worker socket of the closed client
// so that this object will get garbage collected
m_workerSocketList[socketData.m_clientNumber - 1] = null;
}
CLOGException.Trace("函数CommunicationLib.CTcpServerAccess.ReadCallBack 异常", CBaseMethods.MyBase.GetExceptionInfo(ex));
}
}
/// <summary>
/// 开始等待客户端数据Start waiting for data from the client
/// </summary>
/// <param name="soc"></param>
/// <param name="clientNumber"></param>
private void WaitForData(System.Net.Sockets.Socket soc, int clientNumber)
{
try
{
if (pfnWorkerCallBack == null)
{
// Specify the call back function which is to be
// invoked when there is any write activity by the
// connected client
pfnWorkerCallBack = new AsyncCallback(ReadCallBack);
}
SocketPacket theSocPkt = new SocketPacket(soc, clientNumber);
soc.BeginReceive(theSocPkt.dataBuffer, 0, theSocPkt.dataBuffer.Length, SocketFlags.None, pfnWorkerCallBack, theSocPkt);
}
catch (SocketException ex)
{
CLOGException.Trace("函数CommunicationLib.CTcpServerAccess.WaitForData 异常", CBaseMethods.MyBase.GetExceptionInfo(ex));
}
}
