window socket的簡單例子

//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庫

int main()
{
	//建立套接字
	SOCKET sListen = ::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (sListen == INVALID_SOCKET)
	{
		printf("Failed socket()\n");
		return 0;
	}
	//填充sockaddr_in結構
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(4567);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;
	//綁定這個套接字到一個本地位址
	if (::bind(sListen,(LPSOCKADDR)&sin,sizeof(sin)) == SOCKET_ERROR)
	{
		printf("Failed bind()\n");
		return 0;
	}
	//進入監聽模式
	if (::listen(sListen,2) == SOCKET_ERROR)
	{
		printf("Failed listen()\n");
		return 0;
	}
	//循環接受客戶的連接配接請求
	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("接受到一個連接配接:%s\r\n",inet_ntoa(remoteAddr.sin_addr));
		//向用戶端發送資料
		::send(sClient,szText,strlen(szText),0);

	}

	//關閉用戶端的連接配接

	::closesocket(sListen);
	return 0;
}

//TCPClient
#include <stdio.h>
#include "InitSock.h"

CInitSock initSock;

int main()
{
	//建立套接字
	SOCKET s = ::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (s == INVALID_SOCKET)
	{
		printf("Failed socket()\n");
		return 0;
	}
	//在這裡可以bind一個本地位址
	//否則系統會自動安排

	//填寫遠端位址資訊
	sockaddr_in servAddr;
	servAddr.sin_family = AF_INET;
	servAddr.sin_port = htons(4567);

	//注意，這裡要填寫伺服器程式（TCPServer程式）所在機器的IP位址
	//如果計算機沒有聯網，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;
	}
	//接收資料
	char buff[256];
	int nRev = ::recv(s,buff,256,0);
	if (nRev>0)
	{
		buff[nRev] = '\0';
		printf("接受到資料:%s",buff);
	}
	
	//向服務端發送資料
	char szText[] = "TCP client demo \r\n";
	::send(s,szText,strlen(szText),0);
	//關閉套接字
	::closesocket(s);

	return 0;
}