#include<iostream>#include <WINSOCK2.H>#pragma comment(lib,"ws2_32.lib")#define LEN 1024 //接收數據的大小using namespace std;  int main(){ //加載套接字庫 WORD wVersionRequested; WSADATA wsaData; int err;  wVersionRequested = MAKEWORD( 1, 1 );  //初始化Socket動態連接庫,請求1.1版本的winsocket庫  err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { return 0; }  if ( LOBYTE( wsaData.wVersion ) != 1 ||  //判斷請求的winsocket是不是1.1的版本    HIBYTE( wsaData.wVersion ) != 1 ) { WSACleanup( );  //清盤 return 0;   //終止對winsocket使用 } //WSADATA ws; //WSAStartup(MAKEWORD(2,2),&ws);// char http[60] = "www.google.com";  //訪問谷歌網頁 SOCKET sock = socket(AF_INET,SOCK_STREAM,0);//建立socket if (sock == INVALID_SOCKET) { cout<<"建立訪問socket套接字失敗!"<<endl; return 0; } sockaddr_in hostadd; hostent* host = gethostbyname(http);//取得主機的IP地址 if(host==NULL) { cout<<"主機處于沒有聯網狀態;"<<endl; return 0; } cout<<"主機處于聯網狀態，現在可以進行通信!"<<endl; memcpy(&hostadd,host->h_addr,sizeof(hostadd));//將返回的IP信息Copy到地址結構 hostadd.sin_family = AF_INET; hostadd.sin_port = htons(80);   char buf[LEN]="GET / HTTP/1.1/r/nHost: ";//構造Http請求數據包 strcat(buf,inet_ntoa(hostadd.sin_addr)); strcat(buf," /r/nContent-Length: 10/r/n/r/n"); strcat(buf,"Connection:close");   int time = 1000; //超時時間 setsockopt(sock,SOL_SOCKET,SO_RCVTIMEO,(char*)&time,sizeof(time));   if (connect(sock,(sockaddr*)&hostadd,sizeof(hostadd)) == SOCKET_ERROR)//連接請求 { cout<<"與網頁建立連接失敗!"<<endl; return 0; } if (SOCKET_ERROR == send(sock,buf,strlen(buf)+1,0))//發送構造好的Http請求包 { cout<<"發送數據包失敗!"<<endl; return 0; } memset(buf,0,LEN); recv(sock,buf,LEN,0);  //接收返回的數據 cout<<"從網頁中獲取的數據為:"<<buf; closesocket(sock); WSACleanup();return 0;}