socket通信(C#客户端+Linux_C客户端+Linux_C服务端)

socket也就不介绍了，相关的都很多，可以在在网上搜。环境是本机为win10，再虚拟一台Ubantu作为linux环境。下面是DEMO。

注意 : windos 与 Linux系统有编码差异，windos为GBK, Linux为utf-8,通信时按各自需要转换编码，这里采用通用UTF-8格式。

 

1、Linux_C服务端

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>

#define MYPORT  8887
#define QUEUE   20
#define BUFFER_SIZE 1024
#define RETURN_BUFFER_SIZE 102400

int main()
{
    ///定义sockfd
    /*
     --------domain用于指定创建套接字所使用的协议族
     AF_UNIX # 创建只在本机进行通信的套接字；
     AF_INET # 使用IPv4TCP/IP协议；
     AF_INET6 # 使用IPv6TCP/IP协议
    ---------type用于指定套接字的类型。
     SOCK_STREAM # 创建TCP流套接字；
     SOCK_DGRAM # 创建DUP套接字；
     SOCK_RAW      # 创建原始套接字；
     ----------protocol通常设定为0，表示通过参数domain指定的协议族和参数type指定的套接字类型来确定使用的协议。
     */
    int server_sockfd = socket(AF_INET,SOCK_STREAM, 0);

    ///定义sockaddr_in
    struct sockaddr_in server_sockaddr;
    server_sockaddr.sin_family = AF_INET;
    server_sockaddr.sin_port = htons(MYPORT);
    server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);

    ///bind，成功返回0，出错返回-1
    if(bind(server_sockfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr))==-1)
    {
        perror("bind");
        exit(1);
    }

    ///listen，成功返回0，出错返回-1
    if(listen(server_sockfd,QUEUE) == -1)
    {
        perror("listen");
        exit(1);
    }

    ///客户端套接字
    char buffer[BUFFER_SIZE];
    char returnBuffer[RETURN_BUFFER_SIZE];
    struct sockaddr_in client_addr;
    socklen_t length = sizeof(client_addr);

    printf("socket server is started! \n");
    ///成功返回非负描述字，出错返回-1
    int conn = accept(server_sockfd, (struct sockaddr*)&client_addr, &length);
    if(conn<0)
    {
        perror("connect");
        exit(1);
    }

    printf("a Client connected  : %u \n",client_addr.sin_addr.s_addr);

    while(1)
    {
        int exitMark = 0;
        memset(buffer,0,sizeof(buffer));
        int len = recv(conn, buffer, sizeof(buffer),0);


        if(strcmp(buffer,"exit\n")==0)
        {
            exitMark = 1;
//            attachMsg = "服务器被指定命令[exit]成功关闭!";
//            break;
        }
        else
        {
//            attachMsg = "   this Msg by server send!";
        }

//        strcpy(attachMsg+strlen(attachMsg),buffer);
        printf("GetMsg: %s",buffer);

//        fputs(buffer, stdout);
        send(conn, buffer, len, 0);

        if(exitMark)
        {
            printf("socket server is closed! \n");
            break;
        }
    }


    close(conn);
    close(server_sockfd);

    return 0;
}

2、Linux_C客户端

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>

#define MYPORT  8887
#define BUFFER_SIZE 1024

int main()
{
    ///定义sockfd
    int sock_cli = socket(AF_INET,SOCK_STREAM, 0);

    ///定义sockaddr_in
    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(MYPORT);  ///服务器端口
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");  ///服务器ip

    ///连接服务器，成功返回0，错误返回-1
    if (connect(sock_cli, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
    {
        perror("connect");
        exit(1);
    }

    char sendbuf[BUFFER_SIZE];
    char recvbuf[BUFFER_SIZE];
    while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
    {
        send(sock_cli, sendbuf, strlen(sendbuf),0); ///发送
        if(strcmp(sendbuf,"exit\n")==0)
            break;
        recv(sock_cli, recvbuf, sizeof(recvbuf),0); ///接收
//        fputs(recvbuf, stdout);
        printf("Client GetMsg: %s",recvbuf);
        memset(sendbuf, 0, sizeof(sendbuf));
        memset(recvbuf, 0, sizeof(recvbuf));
    }

    close(sock_cli);
    return 0;
}

3、Windos_C#客户端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.IO;
using System.Net;


namespace socketClientForLinuxC
{
    class Program
    {
        static void Main(string[] args)
        {
            string sendMsg = string.Empty;
            string recvMsg = string.Empty;
            int sendMark = 0;

            IPAddress address = IPAddress.Parse("192.168.30.137");
            IPEndPoint iep = new IPEndPoint(address, 8887);
            //创建一个Socket
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.Connect(iep);

            while (true)
            {
                sendMsg = Console.ReadLine();
                if (sendMsg.Equals("exit"))
                {
                    sendMark = 1;
                }

                byte[] bs = Encoding.UTF8.GetBytes(sendMsg);
                socket.Send(bs, bs.Length, 0);

                byte[] recvBytes = new byte[1024];
                int bytes;

                //从服务器端接受返回信息
                bytes = socket.Receive(recvBytes, recvBytes.Length, 0);
                recvMsg = Encoding.UTF8.GetString(recvBytes, 0, bytes);


                if (sendMark == 1) break;
                Console.WriteLine(recvMsg);
            }

            socket.Close();

            Console.ReadKey();
        }
    }
}