C++ Socket TCP "Hello World!"

//////////////////////////////////////////////////////////////////////////
// TCPServer.cpp

#include <stdio.h>
#include <WINSOCK2.H>

#pragma comment(lib,"WS2_32.lib")
#define	BUF_SIZE	64		// 缓冲区大小

int main(void)
{
WSADATA wsd;			// WSADATA变量
SOCKET	sServer;		// 服务器套接字
SOCKET  sClient;		// 客户端套接字
int		retVal;			// 返回值
char	buf[BUF_SIZE];	// 接受数据

// 初始化套接字动态库
ZeroMemory(buf,BUF_SIZE);
if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
{
printf("WSAStartup failed !/n");
return 1;
}

// 创建套接字
sServer = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET == sServer)
{
printf("socket failed !/n");
WSACleanup();
return -1;
}

// 服务器套接字地址
SOCKADDR_IN	addrServ;
addrServ.sin_family = AF_INET;
addrServ.sin_port = htons(4999);
addrServ.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

// 绑定套接字
retVal = bind(sServer,(const struct sockaddr*)&addrServ,sizeof(SOCKADDR_IN));
if(SOCKET_ERROR == retVal)
{
printf("bind failed !/n");
closesocket(sServer);
WSACleanup();
return -1;
}

// 监听套接字
retVal = listen(sServer,1);
if(SOCKET_ERROR == retVal)
{
printf("listen failed !/n");
closesocket(sServer);
WSACleanup();
return -1;
}

// 接受客户请求
sockaddr_in addrClient;
int addrClientlen = sizeof(addrClient);
sClient = accept(sServer,(sockaddr FAR*)&addrClient,&addrClientlen);
if(INVALID_SOCKET == sClient)
{
printf("accept failed !/n");
closesocket(sServer);
WSACleanup();
return -1;
}

// 接受客户数据
retVal = recv(sClient,buf,BUFSIZ,0);
if(SOCKET_ERROR == retVal)
{
printf("recv failed !/n");
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return -1;
}

// 退出程序
printf("Recv From Client:%s/n",buf);
retVal = send(sClient,"Hello World !",strlen("Hello World !"),0);
if(SOCKET_ERROR == retVal)
{
printf("send failed !/n");
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return -1;
}

// 退出程序
closesocket(sServer);
closesocket(sClient);
WSACleanup();
return 0;
}

//////////////////////////////////////////////////////////////////////////
// TCPClient.cpp

#include <stdio.h>
#include <Winsock2.H>

#pragma comment(lib,"WS2_32.lib")
#define	BUF_SIZE	64			// 缓冲区大小

int main(void)
{
WSADATA		wsd;			// 初始化数据库
SOCKET		sHost;			// 服务器套接字
SOCKADDR_IN servAddr;		// 服务器地址
char		buf[BUF_SIZE];	// 接受数据缓冲区
int			retVal;			// 返回值

if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
{
printf("WSAStartup failed !/n");
return 1;
}

// 创建套接字
sHost = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(INVALID_SOCKET == sHost)
{
printf("socket failed !/n");
WSACleanup();
return -1;
}

// 设置服务器地址
servAddr.sin_family = AF_INET;
servAddr.sin_addr.S_un.S_addr = inet_addr("192.168.1.254");
servAddr.sin_port = htons(4999);
int sServerAddlen = sizeof(servAddr);

// 连接服务器
retVal = connect(sHost,(LPSOCKADDR)&servAddr,sizeof(servAddr));
if(SOCKET_ERROR == retVal)
{
printf("connect failed !/n");
closesocket(sHost);
WSACleanup();
}

// 向服务器发送数据
ZeroMemory(buf,BUF_SIZE);
strcpy(buf,"Hello World !");
retVal = send(sHost,buf,strlen(buf),0);
if(SOCKET_ERROR == retVal)
{
printf("send failed !/n");
closesocket(sHost);
WSACleanup();
return -1;
}

// 向服务器接受数据
retVal = recv(sHost,buf,sizeof(buf)+1,0);
printf("Recv From Server: %s/n",buf);

// 退出程序
closesocket(sHost);
WSACleanup();
return 0;
}