2.5 建立简单的TCP服务器和客户端
- 在服务器绑定连接端口时,_sin.sin_port = htons(4567); // htons()将主机字节顺序转换为网络字节顺序。网络和本机字节序不同,需要转换,一个是大端编码,一个是小端编码。
服务器:
//
// main.cpp
// hellocpp
//
// Created by Surser on 2020/1/17.
// Copyright © 2020 Surser. All rights reserved.
//
#ifdef _WIN32
#include<windows.h>
#include<WinSock2.h>
#else
#include <unistd.h>
#include<arpa/inet.h>
#include<string.h>
#define SOCKET int
#define INVALID_SOCKET (SOCKET) (~0)
#define SOCKET_ERROR (-1)
#endif
#include <stdio.h>
#include<thread>
#include<iostream>
using namespace std;
int main(int argc, const char * argv[]) {
//
//1. 建立一个socket 三个参数变量,1 ip编码方式 ipv4;2 流式,面向字节流的;3 TCP;
SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
//2. bind 绑定用于接受客户端连接的端口
sockaddr_in _sin = {};
_sin.sin_family = AF_INET;
_sin.sin_port = htons(4567); //网络和本机字节序编码不同,需要转换,一个是大端编码,一个是小端编码
_sin.sin_addr.s_addr = INADDR_ANY; // 本机ip地址
if(SOCKET_ERROR == ::bind(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in))){
cout<<"ERROR!绑定用于接受客户端连接的端口失败!\n";
}
else{
cout<<"绑定用于接受客户端连接的端口成功!\n";
}
//3. listen 监听网络端口
if(SOCKET_ERROR == listen(_sock, 5)){
cout<<"ERROR!监听网络端口失败!\n";
}
else{
cout<<"监听网络端口成功!\n";
}
//4. accept 等待接受客户端连接
sockaddr_in clientAddr = {};
socklen_t nAddrLen = sizeof(sockaddr_in);
SOCKET _cSock = INVALID_SOCKET;
char msgBuf[]= "Hello, I'm Server.";
while(true){
_cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
if(INVALID_SOCKET == _cSock){
cout<<"ERROR!接收到无效客户端SOCKET!\n";
}
cout<<"新客户端加入:IP="<< inet_ntoa(clientAddr.sin_addr)<<"\n";
//5. send 向客户端发送一段数据
send(_cSock, msgBuf, strlen(msgBuf)+1, 0);
}
//6. 关闭套接字closesocket
close(_sock);
//
cout<<"hello";
return 0;
}
客户端:
//
// main.cpp
// hellocpp
//
// Created by Surser on 2020/1/17.
// Copyright © 2020 Surser. All rights reserved.
//
#ifdef _WIN32
#include<windows.h>
#include<WinSock2.h>
#else
#include <unistd.h>
#include<arpa/inet.h>
#include<string.h>
#define SOCKET int
#define INVALID_SOCKET (SOCKET) (~0)
#define SOCKET_ERROR (-1)
#endif
#include <stdio.h>
#include<thread>
#include<iostream>
using namespace std;
int main(int argc, const char * argv[]) {
// 1.建立一个socket
SOCKET _sock = socket(AF_INET, SOCK_STREAM, 0);
if(INVALID_SOCKET == _sock){
cout<<"错误!建立套接字失败\n";
}
else{
cout<<"建立套接字成功\n";
}
// 2.连接服务器connect
sockaddr_in _sin = {};
_sin.sin_family = AF_INET;
_sin.sin_port = htons(4567);
_sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int ret = connect(_sock, (sockaddr *) &_sin, sizeof(sockaddr_in));
if(SOCKET_ERROR == ret){
cout<<"错误!连接服务器失败\n";
}
else{
cout<<"连接服务器成功\n";
}
// 3.接收服务器信息 recv
char recvBuf[256]= {};
int nlen = recv(_sock, recvBuf, 256, 0);
if(nlen>0){
cout<<"接收到数据"<<recvBuf<<"\n";
}
else{
cout<<"没接收到数据\n";
}
// 4.关闭套接字close
close(_sock);
getchar();
return 0;
}
2.6 建立能持续处理请求的C/S网络程序
服务器:
//
// main.cpp
// hellocpp
//
// Created by Surser on 2020/1/17.
// Copyright © 2020 Surser. All rights reserved.
//
#ifdef _WIN32
#include<windows.h>
#include<WinSock2.h>
#else
#include <unistd.h>
#include<arpa/inet.h>
#include<string.h>
#define SOCKET int
#define INVALID_SOCKET (SOCKET) (~0)
#define SOCKET_ERROR (-1)
#endif
#include <stdio.h>
#include<thread>
#include<iostream>
using namespace std;
int main(int argc, const char * argv[]) {
//
//1. 建立一个socket 三个参数变量,1 ip编码方式 ipv4;2 流式,面向字节流的;3 TCP;
SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
//2. bind 绑定用于接受客户端连接的端口
sockaddr_in _sin = {};
_sin.sin_family = AF_INET;
_sin.sin_port = htons(4567); //网络和本机字节序编码不同,需要转换,一个是大端编码,一个是小端编码
_sin.sin_addr.s_addr = INADDR_ANY; // 本机ip地址
if(SOCKET_ERROR == ::bind(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in))){
cout<<"ERROR!绑定用于接受客户端连接的端口失败!\n";
}
else{
cout<<"绑定用于接受客户端连接的端口成功!\n";
}
//3. listen 监听网络端口
if(SOCKET_ERROR == listen(_sock, 5)){
cout<<"ERROR!监听网络端口失败!\n";
}
else{
cout<<"监听网络端口成功!\n";
}
//4. accept 等待接受客户端连接
sockaddr_in clientAddr = {};
socklen_t nAddrLen = sizeof(sockaddr_in);
SOCKET _cSock = INVALID_SOCKET;
_cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
if(INVALID_SOCKET == _cSock){
cout<<"ERROR!接收到无效客户端SOCKET!\n";
}
cout<<"新客户端加入:socket = "<<(int)_cSock<<"IP="<< inet_ntoa(clientAddr.sin_addr)<<"\n";
char _recvbuf[128]={};
while(true){
//5. 接受客户端请求
int nLen = recv(_cSock, _recvbuf, 128, 0);
if(nLen<=0){
cout<<"客户端已退出,任务结束。\n";
break;
}
cout<<"收到命令:"<<_recvbuf<<"\n";
//6. 处理请求
if(0 == strcmp(_recvbuf, "getName")){
char msgBuf[128]= "Xiao Fang.";
// 8. send 向客户端发送一段数据
send(_cSock, msgBuf, strlen(msgBuf)+1, 0);
}else if(0 == strcmp(_recvbuf, "getAge")){
char msgBuf[128]= "18 years old.";
send(_cSock, msgBuf, strlen(msgBuf)+1, 0);
}else {
char msgBuf[128]= "???.";
send(_cSock, msgBuf, strlen(msgBuf)+1, 0);
}
}
//8. 关闭套接字closesocket
close(_sock);
//
cout<<"服务器已退出。\n";
getchar();
return 0;
}
客户端:
//
// main.cpp
// hellocpp
//
// Created by Surser on 2020/1/17.
// Copyright © 2020 Surser. All rights reserved.
//
#ifdef _WIN32
#include<windows.h>
#include<WinSock2.h>
#else
#include <unistd.h>
#include<arpa/inet.h>
#include<string.h>
#define SOCKET int
#define INVALID_SOCKET (SOCKET) (~0)
#define SOCKET_ERROR (-1)
#endif
#include <stdio.h>
#include<thread>
#include<iostream>
using namespace std;
int main(int argc, const char * argv[]) {
// 1.建立一个socket
SOCKET _sock = socket(AF_INET, SOCK_STREAM, 0);
if(INVALID_SOCKET == _sock){
cout<<"错误!建立套接字失败\n";
}
else{
cout<<"建立套接字成功\n";
}
// 2.连接服务器connect
sockaddr_in _sin = {};
_sin.sin_family = AF_INET;
_sin.sin_port = htons(4567);
_sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int ret = connect(_sock, (sockaddr *) &_sin, sizeof(sockaddr_in));
if(SOCKET_ERROR == ret){
cout<<"错误!连接服务器失败\n";
}
else{
cout<<"连接服务器成功\n";
}
while (true)
{
// 3.输入请求命令
char cmdBuf[128]={};
cin>>cmdBuf;
// 4.处理请求命令
if(0 == strcmp(cmdBuf, "exit"))
{
cout<<"收到exit,任务结束。\n";
break;
}
else
{
//5.向服务器发送请求命令
send(_sock, cmdBuf, strlen(cmdBuf) +1, 0);
cout<<"发送成功\n";
}
char recvBuf[128] = {};
int nlen = recv(_sock, recvBuf, 128, 0);
if(nlen>0){
cout<<"接收到数据:"<<recvBuf<<"\n";
}
else{
cout<<"没接收到数据\n";
}
}
// 6.接受服务器信息recv
// 7.关闭套接字close
close(_sock);
cout<<"客户端已退出。\n";
getchar();
return 0;
}