1---Windows下Tcp Socket的基本结构（客户端、服务端）（转载）

本文提供了一个Windows环境下使用C++实现的Socket编程示例，包括服务端与客户端的完整代码。通过该示例可以了解如何创建、绑定、监听Socket，并实现客户端和服务端之间的数据收发。

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1.服务端

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS //for inet_pton()
 
#include <windows.h>
#include <WinSock2.h>
#include <iostream>
 
#pragma comment(lib, "ws2_32.lib")
 
using namespace std;
 
int main()
{
	WORD ver = MAKEWORD(2, 2);
	WSADATA dat;
	WSAStartup(ver, &dat);
 
	//建立socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == _sock){
		std::cout << "ERROR:建立socket失败!" << std::endl;
	}
	else {
		std::cout << "建立socket成功!" << std::endl;
	}
 
	//初始化服务端地址
	struct sockaddr_in _sin = {};
	_sin.sin_addr.S_un.S_addr = inet_addr("192.168.0.104");
	//_sin.sin_addr.S_un.S_addr = INADDR_ANY;
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
 
	//绑定服务端地址
	if (SOCKET_ERROR == bind(_sock, (struct sockaddr*)&_sin, sizeof(_sin))){
		std::cout << "ERROR:绑定地址失败!" << std::endl;
	}
	else {
		std::cout << "绑定地址成功!" << std::endl;
	}
 
	//监听网络端口
	if (SOCKET_ERROR == listen(_sock, 5)) {
		std::cout << "ERROR:监听网络端口失败!" << std::endl;
	}
	else {
		std::cout << "监听网络端口成功!" << std::endl;
	}
 
	//用来保存客户端地址
	struct sockaddr_in _clientAddr = {};
	int nAddrLen = sizeof(_clientAddr);
	SOCKET _cSock = INVALID_SOCKET;
	char msgBuf[] = "Hello, I'm Server.";
 
	//接收客户端连接
	_cSock = accept(_sock, (struct sockaddr*)&_clientAddr, &nAddrLen);
	if (INVALID_SOCKET == _cSock) {
		std::cout << "ERROR:接收到无效客户端!" << std::endl;
	}
	else {
		std::cout << "接受到新的客户端连接,IP=" << inet_ntoa(_clientAddr.sin_addr)
			<< ",Socket=" << static_cast<int>(_cSock) << std::endl;
	}
 
	char recvBuf[1024] = {};
	//循环处理客户端的数据
	while (true)
	{
		//接受数据
		int _nLen = recv(_cSock, recvBuf, 1024, 0);
		if (_nLen < 0) {
			std::cout << "recv函数出错！" << std::endl;
			break;
		}
		else if (_nLen == 0) {
			std::cout << "客户端已退出！" << std::endl;
			break;
		}
		std::cout << "收到命令" << recvBuf << std::endl;
		if (0 == strcmp(recvBuf, "getName")) {
			char msgBuf[] = "dongshao";
			send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
		}
		else if (0 == strcmp(recvBuf, "getAge")) {
			char msgBuf[] = "21";
			send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
		}
		else {
			char msgBuf[] = "命令不正确";
			send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
		}
	}
	
	//关闭服务端套接字
	closesocket(_sock);
	WSACleanup();
 
	std::cout << "服务端停止工作!" << std::endl;
	getchar();  //防止程序一闪而过
	return 0;
}

2.客户端

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS //for inet_pton()
 
#include <windows.h>
#include <WinSock2.h>
#include <iostream>
 
#pragma comment(lib, "ws2_32.lib")
 
using namespace std;
 
int main()
{
	WORD ver = MAKEWORD(2, 2);
	WSADATA dat;
	WSAStartup(ver, &dat);
 
	//建立socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == _sock) {
		std::cout << "ERROR:建立socket失败!" << std::endl;
	}
	else {
		std::cout << "建立socket成功!" << std::endl;
	}
 
	//声明要连接的服务端地址
	struct sockaddr_in _sin = {};
	_sin.sin_addr.S_un.S_addr = inet_addr("192.168.0.104");
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
 
	//连接服务端
	int ret = connect(_sock, (struct sockaddr*)&_sin, sizeof(_sin));
	if (SOCKET_ERROR == ret) {
		std::cout << "ERROR:连接服务端失败!" << std::endl;
	}
	else {
		std::cout << "连接服务端成功!" << std::endl;
	}
 
	char cmdBuf[256] = {};
	while (true)
	{
		//输入数据
		std::cout << "cmd#:";
		std::cin >> cmdBuf;
 
		//如果输入的是exit，退出程序
		if (0 == strcmp(cmdBuf, "exit")) {
			break;
		}
 
		//向服务端发送自己的命令
		int _nLen = send(_sock, cmdBuf, strlen(cmdBuf) + 1, 0);
		if (_nLen == 0) {
			std::cout << "输入有误，重新发送" << std::endl;
			continue;
		}
		else {
			char recvBuf[1024] = {};
			_nLen = recv(_sock, recvBuf, sizeof(recvBuf), 0);
			if (_nLen <= 0) {
				std::cout << "命令接收错误" << std::endl;
				continue;
			}
			else {
				std::cout << recvBuf << std::endl;
			}
		}
	}
 
	//关闭服务端套接字
	closesocket(_sock);
	WSACleanup();
 
	std::cout << "客户端停止工作!" << std::endl;
	getchar();  //防止程序一闪而过
	return 0;
}