用FTP协议设计一个文件传送客户端程序。实验平台为Visual Basic开发平台。将程序输入到计算机后运行程序，输入服务器的IP地址，端口号、用户名和密码连接后，传送文件。-Design with a file transfer protocol FTP client program. Experimental platform for the Visual Basic development platform. After the program input to the computer running the program, enter the server' s IP address, port number, user name and password connection, transfer files.