C#客户端套接字多次发送和接收
我正在使用套接字进行TCP-IP连接,我想从客户端建立简单的系统发送接收C#客户端套接字多次发送和接收,c#,sockets,tcp-ip,C#,Sockets,Tcp Ip,我正在使用套接字进行TCP-IP连接,我想从客户端建立简单的系统发送接收 Socket sck; sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint localEndpt = new IPEndPoint(IPAddress.Parse("123.123.123.1"), 12345); try
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();
问题是第一个请求通过,但第二个请求不通过,因为套接字不再可用(套接字“available”属性值为0)。我做错了什么?建立多个发送-接收请求(按顺序)的最简单方法是什么。可用不表示套接字是否可用,但传入数据可用于读取:
您的程序退出,因为它在发送消息后立即检查回复(传入数据)。在检查数据之前,使用
线程。睡眠
可能消息甚至还没有发送,因为Socket.Send
只是将其放在网络接口卡的输出缓冲区中。当套接字最终发送消息时,它将更新连接状态。如果它没有得到回复(在TCP连接上),它将在您查询状态时告诉您它已断开连接。在UDP上,它不会告诉您任何信息,因为UDP是无连接的。Socket。可用
不表示套接字是否可用,但传入数据可用于读取:
您的程序退出,因为它在发送消息后立即检查回复(传入数据)。在检查数据之前,使用线程。睡眠
可能消息甚至还没有发送,因为Socket.Send
只是将其放在网络接口卡的输出缓冲区中。当套接字最终发送消息时,它将更新连接状态。如果它没有得到回复(在TCP连接上),它将在您查询状态时告诉您它已断开连接。在UDP上,它不会告诉你什么,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);
}
}
}
}
交叉线程中的更新列表框
:
此代码可以放在注释部分
myListBox1.Invoke((Action)(() => { myListBox1.Items.Add(txt) }));
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);
}
}
}
}
交叉线程中的更新列表框
:
此代码可以放在注释部分
myListBox1.Invoke((Action)(() => { myListBox1.Items.Add(txt) }));