TCP Socket编程 C/C++实现 （Windows Platform SDK）

C语言TCP程序中的Hello World。以前一直用OO语言，现在用C语言写着玩，思想上有点转不过来弯，o(∩_∩)o... Server：

#pragma comment(lib, "ws2_32.lib")

#include 

#include 



void main()

{

	//版本协商

	WORD wVersionRequested;

	WSADATA wsaData;

	int err;

	

	wVersionRequested = MAKEWORD(1,1); //0x0101

	err = WSAStartup(wVersionRequested,&wsaData);

	if(err!=0)

	{

		return;

	}

	

	if(LOBYTE(wsaData.wVersion)!=1 || HIBYTE(wsaData.wVersion)!=1) 

		//wsaData.wVersion!=0x0101

	{

		WSACleanup();

		return;

	}

	//创建Socket

	SOCKET sockSvr = socket(AF_INET,SOCK_STREAM,0);

	//创建IP地址和端口

	SOCKADDR_IN addrSvr;

	addrSvr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

	addrSvr.sin_family = AF_INET;

	addrSvr.sin_port = htons(6000);

	//绑定端口监听

	bind(sockSvr,(SOCKADDR*)&addrSvr,sizeof(SOCKADDR));

	listen(sockSvr,5);

	

	sockaddr_in addrClient;

	int len = sizeof(sockaddr);

	while(true)

	{

		//阻塞方法，获得一个客户Socket连接

		SOCKET sockConn = accept(sockSvr,(sockaddr*)&addrClient,&len);

		char sendbuffer[128];

		sprintf(sendbuffer,"Welcom %s!",inet_ntoa(addrClient.sin_addr));

		//向客户Socket发送数据

		send(sockConn,sendbuffer,strlen(sendbuffer)+1,0);

		char recvbuffer[128];

		//从客户Soc接受数据

		recv(sockConn,recvbuffer,128,0);

		printf("%s/n",recvbuffer);

		//关闭Socket

		closesocket(sockConn);

	}

	closesocket(sockSvr);

	//释放Winsock资源

	WSACleanup();

}

Client：

#pragma comment (lib,"ws2_32.lib")

#include 

#include 



void main()

{

	//版本协商

	WORD wVersionRequested;

	WSADATA wsaData;

	int err;

	

	wVersionRequested = MAKEWORD(1,1); //0x0101

	err = WSAStartup(wVersionRequested,&wsaData);

	if(err!=0)

	{

		return;

	}

	

	if(LOBYTE(wsaData.wVersion)!=1 || HIBYTE(wsaData.wVersion)!=1) 

		//wsaData.wVersion!=0x0101

	{

		WSACleanup();

		return;

	}

	//创建连向服务器的套接字

	SOCKET sock = socket(AF_INET,SOCK_STREAM,0);

	//创建地址信息

	SOCKADDR_IN hostAddr;

	hostAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	hostAddr.sin_family = AF_INET;

	hostAddr.sin_port = htons(6000);

	//连接服务器

	connect(sock,(sockaddr*)&hostAddr,sizeof(sockaddr));

	

	char revBuf[128];

	//从服务器获得数据

	recv(sock,revBuf,128,0);

	printf("%s/n",revBuf);

	//向服务器发送数据

	send(sock,"Hello Host!",12,0);

	closesocket(sock);

}