#include "stdafx.h" #include "boost/asio.hpp" #include "boost/shared_ptr.hpp" #include "boost/thread.hpp" #include <boost/lexical_cast.hpp>//使用字符串轉換功能  using namespace std; using namespace boost::asio;  #ifdef _MSC_VER #define _WIN32_WINNT  0X0501 //避免VC下編譯警告 #endif  //域名解析為IP //入參：域名，端口 //返回：ip地址 vector<string> domain2ip(const char *domain,int port) {   io_service ios;   //創建resolver對象   ip::tcp::resolver slv(ios);   //創建query對象   ip::tcp::resolver::query qry(domain,boost::lexical_cast<string>(port));//將int型端口轉換為字符串   //使用resolve迭代端點   ip::tcp::resolver::iterator it=slv.resolve(qry);   ip::tcp::resolver::iterator end;   vector<string> ip;   for(;it!=end;it++)   {     ip.push_back((*it).endpoint().address().to_string());   }   return ip; }  int _tmain(int argc, _TCHAR* argv[]) {   vector<string> ip=domain2ip("www.csdn.net",0);   for(int i=0;i<ip.size();i++)   {     cout<<ip[i]<<endl;   }   getchar();   return 0; }