// 以下内容用于建立P2P连接
/// <summary>
/// 发起方请求Socket连接
/// </summary>
/// <param name="UserToken">要发送的RTF文本/要发送的文件</param>
/// <param name="isRtf">决定要发送的是什么</param>
private void createSocket(string UserToken, bool isRtf)
{
try
{
// 新建一个封装的P2P通信类
Socket newSocket = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
client = new P2PChatClient(owner, this, newSocket);
if (isRtf)
{
client.rtfToSend = UserToken;
}
else
{
client.fileToSend = UserToken;
}
// 准备连接
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
client.createSocketCompletedEventHandler);
saEA.RemoteEndPoint = new IPEndPoint(
owner.remoteIPaddress[targetName].IpAddress,
owner.PortTCPSend);
// 连接
client.socket.ConnectAsync(saEA);
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：createSocket");
Trace.WriteLine(ex.Message);
}
}
/// <summary>
/// 将P2PChatClient与FormChat互相绑定
/// 如果没有FormChat则创建
/// </summary>
/// <param name="p2pClient"></param>
/// <param name="targetName">发起方的用户名</param>
public void SetChatFormClient(P2PChatClient p2pClient, string targetName)
{
if (!formChats.ContainsKey(targetName))
{
formChats.Add(targetName, new FormChat(this, targetName));
}
formChats[targetName].SetHandlerForSocket(p2pClient);
}
/// <summary>
/// 设置与对方的P2PChatClient，并将P2PChatClient的owner设为自己。
/// 由于对方连接到自己而调用。
/// </summary>
/// <param name="newSocketHandler"></param>
public void SetHandlerForSocket(P2PChatClient newSocketHandler)
{
client = newSocketHandler;
client.SetOwner(this);
}
/// <summary>
/// 接受方
/// 收到1次确认，判断连接的类型
/// </summary>
/// <param name="sender"></param>
/// <param name="ea"></param>
private void firstAckReceivedEventHandler(
object sender, EventArgs ea)
{
Socket rcvSocket = sender as Socket;
try
{
// 接收到的异步Socket事件参数
SocketAsyncEventArgs socketAsyncEA = (SocketAsyncEventArgs)ea;
// 提取接收到的文本
string rcvString =
Encoding.ASCII.GetString(socketAsyncEA.Buffer);
ProtocalHandler protocalHandler =
new ProtocalHandler(MyName);
// 是否是协议
if (!protocalHandler.SetXmlText(rcvString))
{
throw new MyProtocalException(
"不是有效的协议文本，找不到CSP2P标签");
}
// 数据包类型
string type = protocalHandler.GetElementTextByTag("type");
if (type == null)
{
throw new MyProtocalException(
"不是有效的1次确认，找不到type标签");
}
if (type.Equals("closesocket")) // 对方要求关闭Socket
{
rcvSocket.Close();
}
// 对方用户名
string targetNameBase64 =
protocalHandler.GetElementTextByTag("name");
string targetName =
protocalHandler.Base64stringToString(targetNameBase64);
if (targetName == null)
{
throw new MyProtocalException(
"不是有效的1次确认，" +
"找不到name标签");
}
if (type.Equals("init_chat_request")) // 私聊
{
P2PChatClient socketHandler =
new P2PChatClient(this, rcvSocket);
socketHandler.newSocketChatNameReceived(protocalHandler);
}
else if (type.Equals("init_gp_request")) // 群聊
{
P2PGroupClient socketHandler =
new P2PGroupClient(this, rcvSocket);
socketHandler.newSocketGroupNamesReceived(protocalHandler);
}
else
{
throw new MyProtocalException(
"不是有效的1次确认，" +
"type不为init_chat_request或init_gp_request");
}
// 记录对方地址
if (remoteIPaddress.ContainsKey(targetName))
{
remoteIPaddress[targetName] =
new IPInfo((IPEndPoint)rcvSocket.RemoteEndPoint);
}
else
{
remoteIPaddress.Add(targetName,
new IPInfo((IPEndPoint)rcvSocket.RemoteEndPoint));
}
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：" +
"firstAckReceivedEventHandler");
Trace.WriteLine(ex.Message);
// 直接关闭socket
try
{
rcvSocket.Close();
}
catch (Exception ex2)
{
Trace.WriteLine("异常位置：" +
"firstAckReceivedEventHandler出错关闭rcvSocket时");
Trace.WriteLine(ex2.Message);
}
}
}