C++ 简单socket通信（TCP/IP）示例

客户端：

// CilentAndService.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

#include<iostream>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")
using namespace std;
void initialization();
int main() {
//定义长度变量
int send_len = 0;
int recv_len = 0;
//定义发送缓冲区和接受缓冲区
char send_buf[100];
char recv_buf[100];
//定义服务端套接字，接受请求套接字
SOCKET s_server;
//服务端地址客户端地址
SOCKADDR_IN server_addr;
initialization();
//填充服务端信息
server_addr.sin_family = AF_INET;
server_addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
server_addr.sin_port = htons(1234);
//创建套接字
s_server = socket(AF_INET, SOCK_STREAM, 0);
if (connect(s_server, (SOCKADDR *)&server_addr, sizeof(SOCKADDR)) == SOCKET_ERROR) {
cout << "服务器连接失败！" << endl;
WSACleanup();
}
else {
cout << "服务器连接成功！" << endl;
}

//发送,接收数据
while (1) {
cout << "请输入发送信息:";
cin >> send_buf;
send_len = send(s_server, send_buf, 100, 0);
if (send_len < 0) {
cout << "发送失败！" << endl;
break;
}
recv_len = recv(s_server, recv_buf, 100, 0);
if (recv_len < 0) {
cout << "接受失败！" << endl;
break;
}
else {
cout << "服务端信息:" << recv_buf << endl;
}

}
//关闭套接字
closesocket(s_server);
//释放DLL资源
WSACleanup();
return 0;
}
void initialization()
{
//初始化套接字库
WORD w_req = MAKEWORD(2, 2);//版本号
WSADATA wsadata;
int err;
err = WSAStartup(w_req, &wsadata);
if (err != 0) {
cout << "初始化套接字库失败！" << endl;
}
else {
cout << "初始化套接字库成功！" << endl;
}
//检测版本号
if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {
cout << "套接字库版本号不符！" << endl;
WSACleanup();
}
else {
cout << "套接字库版本正确！" << endl;
}
//填充服务端地址信息
}

 

服务端：

// Service.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

#include<iostream>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")
using namespace std;
void initialization();
int main() {
//定义长度变量
int send_len = 0;
int recv_len = 0;
int len = 0;
//定义发送缓冲区和接受缓冲区
char send_buf[100];
char recv_buf[100];
//定义服务端套接字，接受请求套接字
SOCKET s_server;
SOCKET s_accept;
//服务端地址客户端地址
SOCKADDR_IN server_addr;
SOCKADDR_IN accept_addr;
initialization();
//填充服务端信息
server_addr.sin_family = AF_INET;
server_addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(1234);
//创建套接字
s_server = socket(AF_INET, SOCK_STREAM, 0);
if (bind(s_server, (SOCKADDR *)&server_addr, sizeof(SOCKADDR)) == SOCKET_ERROR) {
cout << "套接字绑定失败！" << endl;
WSACleanup();
}
else {
cout << "套接字绑定成功！" << endl;
}
//设置套接字为监听状态
if (listen(s_server, SOMAXCONN) < 0) {
cout << "设置监听状态失败！" << endl;
WSACleanup();
}
else {
cout << "设置监听状态成功！" << endl;
}
cout << "服务端正在监听连接，请稍候...." << endl;
//接受连接请求
len = sizeof(SOCKADDR);
s_accept = accept(s_server, (SOCKADDR *)&accept_addr, &len);
if (s_accept == SOCKET_ERROR) {
cout << "连接失败！" << endl;
WSACleanup();
return 0;
}
cout << "连接建立，准备接受数据" << endl;
//接收数据
while (1) {
recv_len = recv(s_accept, recv_buf, 100, 0);
if (recv_len < 0) {
cout << "接受失败！" << endl;
break;
}
else {
cout << "客户端信息:" << recv_buf << endl;
}
cout << "请输入回复信息:";
cin >> send_buf;
send_len = send(s_accept, send_buf, 100, 0);
if (send_len < 0) {
cout << "发送失败！" << endl;
break;
}
}
//关闭套接字
closesocket(s_server);
closesocket(s_accept);
//释放DLL资源
WSACleanup();
return 0;
}
void initialization() {
//初始化套接字库
WORD w_req = MAKEWORD(2, 2);//版本号
WSADATA wsadata;
int err;
err = WSAStartup(w_req, &wsadata);
if (err != 0) {
cout << "初始化套接字库失败！" << endl;
}
else {
cout << "初始化套接字库成功！" << endl;
}
//检测版本号
if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {
cout << "套接字库版本号不符！" << endl;
WSACleanup();
}
else {
cout << "套接字库版本正确！" << endl;
}
//填充服务端地址信息

}