vb6环境下编写，通过三种方式获取公网IP地址，第一种：使用Winsock控件(MSWINSCK.OCX) 第二种：使用Microsoft Internet Transfer 控件(MSINET.OCX) 第三种：使用Microsoft Internet Control控件(IeFrame.dll)-the vb6 environment written in three ways to obtain a public IP address, first: Winsock control (MSWINSCK.OCX), second: use Microsoft Internet Transfer Control (MSINET.OCX) third: Use Microsoft Internet Control Control(IeFrame.dll)