C/S

socket还不是太熟悉，首先要链接库文件

下面是简单的测试代码，可以运行，已经测试过^^.

S:

#include <iostream>
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")

int main()
{
	SOCKET serversock,clientsock;
	WSADATA  wsa;
	char buf[100];
	struct sockaddr_in serveraddr;

	WSAStartup(MAKEWORD(2,2),&wsa);      

	serversock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);  //使用TCP协议
	serveraddr.sin_family=AF_INET;
	serveraddr.sin_port=htons(6666);
	serveraddr.sin_addr.S_un.S_addr=INADDR_ANY;  //自动获取本地IP地址

	bind(serversock,(struct sockaddr*)&serveraddr,sizeof(serveraddr));
	listen(serversock,1);
	

	clientsock=accept(serversock,NULL,NULL); //返回新的socket
	memset(buf,0,100);
	recv(clientsock,buf,100,0);      //接收客户端的信息
	strcat(buf,"  this is server");
	send(clientsock,buf,100,0);         //服务器发送信息
	closesocket(serversock);
	WSACleanup();                 //释放资源
	return 0;
}

 C:

#include <iostream>
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")

using namespace std;

int main()
{
	SOCKET sockclient;
	struct sockaddr_in clientaddr;
	char buf[100]="I am a mouse";
	WSADATA wsa;

	WSAStartup(MAKEWORD(2,2),&wsa);             //初始化

	sockclient=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);          //使用TCP协议
	clientaddr.sin_family=AF_INET;
	clientaddr.sin_port=htons(6666);
	clientaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
	connect(sockclient,(struct sockaddr*)&clientaddr,sizeof(clientaddr));        //链接服务器

	send(sockclient,buf,100,0);                    //发送信息
	memset(buf,0,100);
	recv(sockclient,buf,100,0);                    //从客户端接收信息
	cout<<"buf:"<<buf<<endl;
	closesocket(sockclient);
	WSACleanup();                                  //释放资源
	system("pause");
	return 0;
}