一个C++实现的简单的C/S程序

简单Tcp编程范例，一个C++实现的简单的C/S程序

//InitSock.h
#pragma once
#include <WinSock2.h>
#pragma comment(lib,"WS2_32")
class CInitSock
{
public:
	CInitSock(BYTE minorVer = 2,BYTE majorVER = 2)
	{
		//初始化WS2_32.dll
		WSADATA wsaData;
		WORD sockVersion = MAKEWORD(minorVer,majorVER);
		if(::WSAStartup(sockVersion,&wsaData)!=0)
			exit(0);
	}
	~CInitSock()
	{
		::WSACleanup();
	}
};
//TCPServer.cpp
#include "InitSock.h"
#include <stdio.h>
CInitSock initSock;	//初始化Winsock库
int main()
{
	//创建套接字
	SOCKET sListen = ::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (sListen == INVALID_SOCKET)
	{
		printf("Failed socket()\n");
		return 0;
	}
	//填充sockaddr_in结构
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(4567);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;
	//绑定这个套接字到一个本地地址
	if (::bind(sListen,(LPSOCKADDR)&sin,sizeof(sin)) == SOCKET_ERROR)
	{
		printf("Failed bind()\n");
		return 0;
	}
	//进入监听模式
	if (::listen(sListen,2) == SOCKET_ERROR)
	{
		printf("Failed listen()\n");
		return 0;
	}
	//循环接受客户的连接请求
	sockaddr_in remoteAddr;
	int nAddrLen = sizeof(remoteAddr);
	printf("Length of sockaddr_in is: %d",nAddrLen);
	SOCKET sClient;
	char szText[] = "TCP Server Demo!\r\n";
	while(TRUE)
	{
		sClient = ::accept(sListen,(SOCKADDR *)&remoteAddr,&nAddrLen);
		if (sClient == INVALID_SOCKET)
		{
			printf("Failed accapt()");
			continue;
		}
		printf("接受到一个连接:%s\r\n",inet_ntoa(remoteAddr.sin_addr));
		//向客户端发送数据
		::send(sClient,szText,strlen(szText),0);
	}
	//关闭客户端的连接
	::closesocket(sListen);
	return 0;
}
//TCPClient
#include <stdio.h>
#include "InitSock.h"
CInitSock initSock;
int main()
{
	//创建套接字
	SOCKET s = ::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (s == INVALID_SOCKET)
	{
		printf("Failed socket()\n");
		return 0;
	}
	//在这里可以bind一个本地地址
	//否则系统会自动安排
	//填写远程地址信息
	sockaddr_in servAddr;
	servAddr.sin_family = AF_INET;
	servAddr.sin_port = htons(4567);
	//注意，这里要填写服务器程序（TCPServer程序）所在机器的IP地址
	//如果计算机没有联网，直接使用127.0.0.1即可
	servAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	if (connect(s,(sockaddr *)&servAddr,sizeof(servAddr)) == -1)
	{
		printf("Failed connect()\n");
		return 0;
	}
	//接收数据
	char buff[256];
	int nRev = ::recv(s,buff,256,0);
	if (nRev>0)
	{
		buff[nRev] = '\0';
		printf("接受到数据:%s",buff);
	}
	
	//向服务端发送数据
	char szText[] = "TCP client demo \r\n";
	::send(s,szText,strlen(szText),0);
	//关闭套接字
	::closesocket(s);
	return 0;
}