说明：  VB FTP程序源码，演示如何编写一个文件上传与下载的简单FTP程序，并支持显示上传与下载的文件详细信息，建立msg函数用于反回上传和下载信息，上传和下载之前，必须输入用户名和密码及FTP服务器地址，否则会得到一个无法连接到远程主机的错误，如果没有输入服务器名，会再次收到错误信息。
(VB FTP program source code demonstrates how to write a file upload and download a simple FTP program, and supports the display upload and download file details established msg function is used to return upload and download information, upload and download, you must enter a user name and password, and FTP server address, otherwise it will be unable to connect to a remote host error, If you do not enter the server name, you will receive the error message again.)