private void _ReceiveTcp(IAsyncResult ar)
{
TcpRecvObj obj = (TcpRecvObj)ar.AsyncState;
SocketError err;
int read_size = obj.Client.Client.EndReceive(ar, out err);
if (err == SocketError.Success)
{
if (read_size > 0)
{
//byte buffer轉 unicode 時要這樣處理，
//不然buffer裡的空字元 0x00 會在unicode顯示 \0\0\0\0
string msg = Encoding.ASCII.GetString(obj.Buffer).TrimEnd('\0');
UpdateTextbox(textBox1, msg);
//讀取完資料記得把buffer清一清
Array.Clear(obj.Buffer, 0, obj.Buffer.Length);
}
//如果連線沒斷掉就繼續呼叫AsyncReceive讀下一筆
if (obj.Client.Client.Connected)
{
obj.Client.Client.BeginReceive(obj.Buffer, 0, obj.Buffer.Length, SocketFlags.None, _ReceiveTcp, obj);
}
}
}
private void _AcceptTcpClient(IAsyncResult ar)
{
try
{
TcpClient client = Listener.EndAcceptTcpClient(ar);
TcpRecvObj obj = new TcpRecvObj()
{
Client = client,
Buffer = new byte[256],
};
//不走TcpClient，用更底層的Socket直接讀
client.Client.BeginReceive(obj.Buffer, 0, obj.Buffer.Length, SocketFlags.None, _ReceiveTcp, obj);
Listener.BeginAcceptTcpClient(_AcceptTcpClient, null);
}
catch (Exception ex)
{ }
}
