[英]C# client socket multiple send and receive
我正在使用套接字进行TCP-IP连接,并且我想从客户端建立简单的系统收发。
Socket sck;
sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint localEndpt = new IPEndPoint(IPAddress.Parse("123.123.123.1"), 12345);
try
{
sck.Connect(localEndpt);
}
catch
{
Console.Write("Unable to Connect");
}
while (true)
{
Console.WriteLine("Enter Text");
string sendtext = Console.ReadLine();
byte[] Data = Encoding.ASCII.GetBytes(sendtext);
sck.Send(Data);
Console.WriteLine("Data Sent!");
byte[] bytesReceived = new byte[sck.ReceiveBufferSize];
int bytes = 0;
String strReceived = "";
int dataAvailable = 0;
while (dataAvailable == 0 || dataAvailable != sck.Available)
{
dataAvailable = sck.Available;
Thread.Sleep(100); // if no new data after 100ms assume transmission finished
}
if (sck.Available > 0)
{
bytes = sck.Receive(bytesReceived, bytesReceived.Length, 0);
strReceived+=Encoding.ASCII.GetString(bytesReceived, 0, bytes);
}
Console.WriteLine("Received from server: " + strReceived);
}
Console.Read();
问题在于,第一个请求通过,而第二个请求不通过,因为套接字不再可用(套接字“ Availabe”属性值为0)。 我究竟做错了什么? 建立多个发送接收请求(按顺序)的最简单方法是什么?
Socket. Available
Socket. Available
并不表明插座是否可用,但传入的数据可用于阅读:
https://msdn.microsoft.com/zh-CN/library/ee425135.aspx
您的程序退出是因为它在发出消息后立即检查答复(传入数据)。 在检查数据之前,请使用Thread.Sleep
。
可能甚至没有发送该消息,因为Socket.Send
只是将其放置在网络接口卡的输出缓冲区中。 当套接字最终发送消息时,它将刷新连接状态。 如果没有答复(在TCP连接上),它将在您查询状态时告诉您已断开连接。 在UDP上,它不会告诉您任何信息,因为UDP是无连接的。
这段代码对我来说很好
private List<Socket> _clients = new List<Socket>();
private Thread _dataReceiveThread;
private bool _isConnected;
private void DataReceive()
{
while (_isConnected)
{
List<Socket> clients = new List<Socket>(_clients);
foreach (Socket client in clients)
{
try
{
if (!client.Connected) continue;
string txt = "";
while (client.Available > 0)
{
byte[] bytes = new byte[client.ReceiveBufferSize];
int byteRec = client.Receive(bytes);
if (byteRec > 0)
txt += Encoding.UTF8.GetString(bytes, 0, byteRec);
}
if (!string.IsNullOrEmpty(txt))
/* TODO: access the text received with "txt" */
}
catch (Exception e)
{
Exception_Handler(e);
}
}
}
}
只需运行此代码即可开始
_isConnected = true;
_dataReceiveThread = new Thread(DataReceive);
_dataReceiveThread.Start();
Cross thread
更新列表框 :
该代码可以放在注释部分。
myListBox1.Invoke((Action)(() => { myListBox1.Items.Add(txt) }));
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