简单的客户端/服务器socket编程实例（TCP）

服务器端：

#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<string.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<iostream>

using namespace std;

#define PORT 4002
#define BACKLOG 5

int main()
{
    int listensock, clientsock;
    struct sockaddr_in local_addr;
    struct sockaddr_in client_addr;

    char buf[1024];

    if((listensock = socket(AF_INET,SOCK_STREAM, 0)) == -1)
    {
        cout << "socket create error" << endl;
        exit(1);
    }

    local_addr.sin_family = AF_INET;
    local_addr.sin_port = htons(PORT);
    local_addr.sin_addr.s_addr = INADDR_ANY;
    bzero(&(local_addr.sin_zero), 8);

    if(bind(listensock, (struct sockaddr*)&local_addr, sizeof(struct sockaddr)) == -1)
    {
        cout << "bind error" << endl;
        exit(1);
    }
    else
    {
        cout << "bind success" << endl;
    }

    if(listen(listensock, BACKLOG) == -1)
    {
        cout << "listen error" << endl;
        exit(1);
    }
    else
    {
        cout << "listen success" << endl;
    }

    int addrlen = sizeof(struct sockaddr_in);

    if((clientsock = accept(listensock, (struct sockaddr*)&client_addr,(socklen_t*)&addrlen)) == -1)
    {
        cout << "accept error" << endl;
        exit(1);
    }
    else
    {
        cout << "accept success" << endl;
    }

    cout << "receive a connetion from Ip: " << inet_ntoa(client_addr.sin_addr) << " Port:" << ntohs(client_addr.sin_port) << endl;

    cout << "prepare send data" << endl;

    while(1)
    {
        cin >> buf;
        int sendlen = strlen(buf);
        if((send(clientsock, buf, sendlen, 0)) == -1)
        {
            cout << "send data error" << endl;
        }
    }

    close(clientsock);

}

客户端：

 

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<sys/wait.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<iostream>

using namespace std;

#define PORT 4002

int main()
{
    int sockfd;
    struct sockaddr_in serv_addr;

    char buf[1024];
    int recvlen;

    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        cout << "socket create error" << endl;
        exit(1);
    }

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    serv_addr.sin_addr.s_addr = inet_addr("10.0.30.66");
    bzero(&(serv_addr.sin_zero), 8);

    if((connect(sockfd, (struct sockaddr*)&serv_addr, sizeof(struct sockaddr))) == -1)
    {
        cout << "connect error" << endl;
        exit(1);
    }

    cout << "prepare recv data" << endl;

    while(1)
    {

        if((recvlen = recv(sockfd, buf, sizeof(buf), 0)) == -1)
        {
            cout << "recv error" << endl;
            exit(1);
        }

        buf[recvlen] = '\0';
        cout << "received: " << buf << endl;
    }

    close(sockfd);
}