功能是在利用socket提供的API函数, 填充并发送ICMP包,测试指定IP地址段中活动主机. 使用简单的connect方法来测试目的端口是否可通.-Function is provided in the use of the API function socket, filling and send ICMP packets to test the IP address of the designated host paragraph activities. Connect using a simple method to test whether the purpose of port pass.