linux-TCP简单客户端代码

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0x00 开头

写代码前，一定要先理清楚实现的逻辑，之后查找是否存在实现逻辑的系统函数。以下为整理的逻辑

1.创建socket设备文件

2.connect连接到指定的服务器

3.write发送信息给服务器

0x01 代码实现

/*************************************************************************> File Name: client.cpp> Author: reacher> Mail: > Created Time: Mon 28 Aug 2017 05:44:56 PM PDT ************************************************************************/#include<iostream>#include <string.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <stdio.h>#include <netinet/in.h>#include <arpa/inet.h>#include <unistd.h>using namespace std;#define ErrorMsg(msg){\       do{\         printf("%s \n", msg);   \       }while(0);\}int main(int argc, char* argv[]){    int execute_status = 0;    int socket_fd = socket(AF_INET, SOCK_STREAM, 0);    if(-1 == socket_fd)    {        ErrorMsg("create socket err!");        exit(1);    }    struct sockaddr_in addr;    addr.sin_family = AF_INET;    addr.sin_port = htons(9999);    addr.sin_addr.s_addr = inet_addr("127.0.0.1");    execute_status = connect(socket_fd, (sockaddr*)&addr, sizeof(struct sockaddr_in));    if(-1 == execute_status)    {        ErrorMsg("bind err!");        exit(1);    }    char sendBuf[1024];    memset(sendBuf, 0, sizeof(sendBuf));    strcpy(sendBuf, "gua-Server,i'm gua client! hello");    int size_len = strlen(sendBuf);    write(socket_fd,sendBuf,size_len);    return 0;}

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