一个简单的TCP客户端

1.目录结构
->include //存放.h头文件
->source //存放.cpp源文件
->out //存放可执行文件
->makefile //一键执行

2.源码
2.1 Client.h

#ifndef _Client_H_
#define _Client_H_
#define INVALID_SOCKET -1
#define MAX_IP_ADDR_LENTH 32
#define MAX_PORT_LENTH 8
#define MAX_REV_BUFF_SIZE 1024
#define MAX_SED_BUFF_SIZE 1024
#include <iostream>


#endif

2.2 Client.cpp

#include "Client.h"

#include <errno.h>  //perror 打印一些错误信息
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/socket.h>
#include <netinet/in.h>  
#include <string.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>  //提供close方法
#include <arpa/inet.h> // 提供 inet_addr
#include <cstdlib> //atoi 将字符串数组转化为数字
#include <string.h>
#include "tcp_common.h"
int main(int argc, char *argv[])
{
    if(argc < 2)
    {
        std::cout<<"[Usage:] ip prot"<<std::endl;
        std::cout<<"./client 10.234.19.202 15001"<<std::endl;
        return -1;
    }
	char IP_ADDR[MAX_IP_ADDR_LENTH] = { 0 };
	char PORT[MAX_PORT_LENTH] = { 0 };
	strncpy(IP_ADDR ,argv[1] , MAX_IP_ADDR_LENTH);
	strncpy(PORT, argv[2], MAX_PORT_LENTH);
	int client_port = atoi(PORT);
	std::cout << "ip = " << IP_ADDR << std::endl;
	std::cout << "port = " << PORT << std::endl;
	std::cout << "client_port = " << client_port << std::endl;
	//待优化得是对输入得ip和port先进行简单得判断，不需要等到绑定端口IP失败才返回

    int Client_Socket_Fd;
	Client_Socket_Fd = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == Client_Socket_Fd)
	{
		std::cout << "sock creat failed!" << std::endl;
		return -1;
	}
	sockaddr_in Server_addr_;

	Server_addr_.sin_addr.s_addr = inet_addr((const char *)IP_ADDR);
	Server_addr_.sin_family = AF_INET;
	Server_addr_.sin_port = htons(client_port);

	while (1)
	{
		std::cout << "begin to connect!" << std::endl;
		if (connect(Client_Socket_Fd, (sockaddr*)&Server_addr_, sizeof(sockaddr_in)) != 0)
		{
			perror("connect");
			printf("connect failed , wait for reconnect!\n");
			sleep(1);
		}
		else
		{
			std::cout << " connected!" << std::endl;
			char buff_rev[MAX_REV_BUFF_SIZE] = { 0 };
			int buflen = recv(Client_Socket_Fd, buff_rev, MAX_REV_BUFF_SIZE, 0);
			if(buflen < 0)
			{
				std::cout << "receive message:" << buff_rev << std::endl;
			}
			/*char buff_send[MAX_SED_BUFF_SIZE] = { 0 };*/
			student student_send = {0};
			std::cout << "Please input name: ";
			std::string t_name;
			getline(std::cin, t_name);
			memcpy(student_send.name,t_name.c_str(),sizeof(student_send.name));

			std::cout << "Please input age:";
			//char *t_age ; //野指针只想得位置不确定
			//fgets(t_age,4, stdin);  //fgets会把标准输入得内容放到内存得某个区域，如果t_age指向得时不可读不可写得区域都会导致段错误
			//student_send.age = atoi((const char * )t_age);
			//那为什么直接char *t_age = "sdasdas";就不会出错呢？ 因为"sdasdas"这个字符串是存储在静态区得，所以这个指针也就不是野指针了

			char t_age[4];
			fgets(t_age,4,stdin);
			student_send.age = atoi((const char *)t_age);

			std::cout << "Please input sex(female or male):";
			std::string t_sex;
			getline(std::cin,t_sex );

			std::cout << "t_sex = " << t_sex << std::endl;
			if (!strcmp(t_sex.c_str(),"female" ))
			{
				student_send.sex = FEMALE;
			}
			else if (!strcmp(t_sex.c_str(),"male"))
			{
				student_send.sex = MALE;
			}
			else
			{
				std::cout << "dsdad";
				student_send.sex = INVALID;
			}
			//stricmp() 用来比较字符串，不区分大小写；区分大小写比较字符串请查看strcmp()。
			student_send.printStudent();
			send(Client_Socket_Fd, (void *)&student_send, sizeof(student), 0);
			//break;
		}
	}

	close(Client_Socket_Fd);
	return 0;


}