说明：  我在一个项目中要找到网上的网络打印机（可能不只一台），并需要在向网络打印机传送和打印文件，其实挺简单的，只是做的麻烦，也许你用得着
(in a project to find online network printers (may be more than one channel), and the need to network printers and print file transmission, in fact quite simple, but only the trouble, you probably worthwhile)