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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没有问题。是不是因为我的客户端没有连接到我的服务器客户端。有人知道吗？对不起我的英语，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);
        }
    }
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2 回答 2

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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);

你正在连接到你自己。您需要将 127.0.0.1 更改为实际的服务器 IP 地址...

////我假设客户端和服务器不在同一个设备上。

于 2015-07-11T13:46:55.923 回答
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您可能喜欢route_io，它是基于 c/c++ 的库，它使 udp/tcp/http 全部在一个实例中。您只需获取源代码和示例，即可为您的项目做任何您想做的事情。简单示例

#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;
}
于 2018-08-04T13:50:37.157 回答