//客户端代码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main()
{
    //创建socket---用于和服务端进行通信
    int cfd = socket(AF_INET, SOCK_STREAM, 0);
    if(cfd < 0)
    {
        perror("socket error");
        return -1;
    }

    //连接服务端
    // int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);
    struct sockaddr_in serv;
    serv.sin_family = AF_INET;
    serv.sin_port = htons(8888);
    //把字符串IP转换成了网络字节序IP（整形值）
    inet_pton(AF_INET, "127.0.0.1", &serv.sin_addr.s_addr);
    printf("[%x]", serv.sin_addr.s_addr);
    int ret = connect(cfd, (struct sockaddr *)&serv, sizeof(serv));
    if(ret < 0)
    {
        perror("connect error");
        return -1;
    }

    //收发数据
    int n = 0;
    char buf[1024];
    while(1)
    {   
        //读标准输入数据
        memset(buf, 0x00, sizeof(buf));
        n = read(STDIN_FILENO, buf, sizeof(buf));
        //发送数据
        write(cfd, buf, n);

        //读服务端发过来的数据
        memset(buf, 0x00, sizeof(buf));
        n = read(cfd, buf, sizeof(buf));
        if(n <= 0)
        {
            printf("read error or server closed, n==%d", n);
        }
        printf("n == [%d], buf == [%s]\n", n, buf);
    }

    //关闭套接字
    close(cfd);
    return 0;
}