private void ReceiveCallback(IAsyncResult ar)
{
MyFriend frd = (MyFriend)ar.AsyncState;
try
{
int i = frd.socket.EndReceive(ar);
if (i == 0)
{
comboBoxClient.Invoke(Removefriend, frd);
return;
}
else
{
string data = Encoding.UTF8.GetString(frd.Rcvbuffer, 0, i);
infoData = data; //将传来的数据传给infoData
lineNum = listBoxStatu.Items.Count; //将行数赋值给lineNum
data = string.Format("From[{0}]:{1}", frd.socket.RemoteEndPoint.ToString(), data);
comboBoxClient.SelectedItem = (frd.socket.RemoteEndPoint.ToString()); //收到信息之后选中发送信息的ip
listBoxStatu.Invoke(AppendString, data);
frd.ClearBuffer();
AsyncCallback callback = new AsyncCallback(ReceiveCallback);
frd.socket.BeginReceive(frd.Rcvbuffer, 0, frd.Rcvbuffer.Length, SocketFlags.None, callback, frd);
}
}
catch
{
comboBoxClient.Invoke(Removefriend, frd);
}
}
private void AcceptCallBack(IAsyncResult ar)
{
try
{
//完成异步接收连接请求的异步调用
//将连接信息添加到列表和下拉列表中
Socket handle = listener.EndAcceptSocket(ar);
MyFriend frd = new MyFriend(handle);
comboBoxClient.Invoke(Addfriend, frd);
AsyncCallback callback;
//继续调用异步方法接收连接请求
if (IsStart)
{
callback = new AsyncCallback(AcceptCallBack);
listener.BeginAcceptSocket(callback, listener);
}
//开始在连接上进行异步的数据接收
frd.ClearBuffer();
callback = new AsyncCallback(ReceiveCallback);
frd.socket.BeginReceive(frd.Rcvbuffer, 0, frd.Rcvbuffer.Length, SocketFlags.None, callback, frd);
}
catch
{
//在调用EndAcceptSocket方法时可能引发异常
//套接字Listener被关闭，则设置为未启动侦听状态
IsStart = false;
}
}
//向下拉列表中添加信息的委托方法
private void AddMethod(MyFriend frd)
{
lock (friends)
{
friends.Add(frd);
}
comboBoxClient.Items.Add(frd.socket.RemoteEndPoint.ToString());
}
//从下拉列表中删除信息的委托方法
private void RemoveMethod(MyFriend frd)
{
int i = friends.IndexOf(frd);
comboBoxClient.Items.RemoveAt(i);
lock (friends)
{
friends.Remove(frd);
}
frd.Dispose();
}
private void SendCallback(IAsyncResult ar)
{
MyFriend frd = (MyFriend)ar.AsyncState;
try
{
frd.socket.EndSend(ar);
}
catch
{
comboBoxClient.Invoke(Removefriend, frd);
}
}
private void SendData(MyFriend frd, string data)
{
try
{
byte[] msg = Encoding.UTF8.GetBytes(data);
AsyncCallback callback = new AsyncCallback(SendCallback);
frd.socket.BeginSend(msg, 0, msg.Length, SocketFlags.None, callback, frd);
//data = string.Format("To[{0}]:{1}", frd.socket.RemoteEndPoint.ToString(), data);
//listBoxStatu.Invoke(AppendString, data);
}
catch
{
comboBoxClient.Invoke(Removefriend, frd);
}
}
