Question

我有问题。为什么我的客户端无法从服务器接收数据？服务器正在从客户端接收数据而不会出现问题。是因为我的客户端没有连接到我的服务器客户端上。有人知道吗？抱歉我的英语，我来自捷克共和国。：）

这是我的UDP客户端：

    UdpClient client;
    public IPAddress serverIP = IPAddress.Parse("127.0.0.1");
    public Form1()
    {
        InitializeComponent();
        client = new UdpClient();
    }

    public void SendData()
    {
        client.Connect(serverIP, 3000);
        byte[] data = Encoding.ASCII.GetBytes("Hi, I'm new client.");
        client.Send(data, data.Length);
        DoListening();
    }
    public void DoListening()
    {
        IPEndPoint adress = new IPEndPoint(serverIP, 3000);
        byte[] receivedbytes = client.Receive(ref adress);
        string recieved = Encoding.ASCII.GetString(receivedbytes);

        MessageBox.Show("Recieved: " + recieved);
    }
    private void button1_Click(object sender, EventArgs e)
    {
        SendData();
    }

这是我的UDP服务器：

    public Form1()
    {
        InitializeComponent();
        Thread listening = new Thread(new ThreadStart(DoListening));
        listening.Start();
    }
    public void ClientThread(Object adress)
    {
        IPEndPoint ip = adress as IPEndPoint;
        UdpClient client = new UdpClient();
        client.Connect(ip);
        byte[] data = Encoding.ASCII.GetBytes("No nazdar");
        client.Send(data, data.Length);
        MessageBox.Show("Sending data..");
    }
    public void DoListening()
    {
        while (true)
        {
            UdpClient client = null;
            client = new UdpClient(3000);
            IPEndPoint host = new IPEndPoint(IPAddress.Any, 0);
            MessageBox.Show("Listening");
            byte[] receivedbytes = client.Receive(ref host);
            string recieved = Encoding.ASCII.GetString(receivedbytes);
            MessageBox.Show("Client " + host.Address.ToString() + " conected. Message: " + recieved);
            new Thread(new ParameterizedThreadStart(ClientThread)).Start(host);
            Console.WriteLine("Doslo k vyjimce z duvodu : {0}", ex.SocketErrorCode);
        }
    }

Answer 1

不确定，但我认为您正在尝试连接到localhost

UdpClient client;
public IPAddress serverIP = IPAddress.Parse("127.0.0.1");
public Form1()
{
    InitializeComponent();
    client = new UdpClient();
}

public void SendData()
{
    client.Connect(serverIP, 3000);

你正在与自己联系。您需要为实际的服务器IP地址更改127.0.0.1 ...

////我假设客户端和服务器不在同一台设备上。

Answer 2

您可能喜欢route_io，它是基于c / c ++的库，它使udp / tcp / http都在一个实例中。您只需要获得源代码和示例就可以为您的项目做任何事情。简单的例子

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "route_io.h"

void init_instance(void *arg);
void read_handler(rio_request_t *req);

void init_instance(void *arg) {
  printf("%s\n", "start instance");
}

void read_handler(rio_request_t *req) {
  printf("preparing echo back %.*s\n", (int) (req->in_buff->end - req->in_buff->start), req->in_buff->start);
  rio_write_output_buffer_l(req, req->in_buff->start, (req->in_buff->end - req->in_buff->start));
}

void on_conn_close_handler(rio_request_t *req) {
  printf("%s\n", "connection closing");
}

int main(void) {

  rio_instance_t * instance = rio_create_routing_instance(24, NULL, NULL);
  rio_add_udp_fd(instance, 12345/*port*/, read_handler, on_conn_close_handler);
  rio_add_tcp_fd(instance, 3232/*port*/, read_handler, 64, on_conn_close_handler);

  rio_start(instance);

  return 0;
}

UDP服务器和UDP客户端

2 个答案: