keyit.focus();} 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 <Winsock2.h>


#include <stdio.h>




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 <Winsock2.h>


#include <stdio.h>




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);


}