bool isConnect;  DWORD dw;  isConnect = ::IsNetworkAlive(&dw);if(isConnect)  　　cout << "IsNetworkAlive连接" <<endl;  else  　　cout << "IsNetworkAlive未连接" <<endl;   cout<< "---------------------------------" <<endl;  //dw和dw2标识，可判断本机是以什么方式连接网络。如：代理、拨号等DWORD dw2;  bool ret = InternetGetConnectedState(&dw2, 0);  if (ret)  　　cout << "InternetGetConnectedState连接" <<endl;  else  　　cout << "InternetGetConnectedState未连接" <<endl;  cout<< "**********************************"  <<endl;       //FLAG_ICC_FORCE_CONNECTION不可少；当该网络连接地址链接不通时，该API需ping一段时间(1~2分钟)      bool bConnected = InternetCheckConnection(_T("http://www.baidu.com"), FLAG_ICC_FORCE_CONNECTION, 0);if (bConnected)  　　cout << "InternetCheckConnection连接" <<endl;  else  　　cout << "InternetCheckConnection未连接" <<endl;  cout<< "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"  <<endl;