虚拟打印的实现。 虚拟打印主要用于将各种文档转换成为各种图形，例如将一个doc文件转换成一个BMP图。我在实现虚拟打印的时候，使用了DDK和DELPHI的一些东西。 -The realization of the virtual printing. Virtual printing is mainly used for a variety of documents to be converted into a variety of graphics, such as a doc file

FTDI’s “D2XX Direct Drivers” for Windows offer an alternative solution to our VCP drivers which allows application software to interface with FT232 USB UART and FT245 USB FIFO devices using a DLL instead of a Virtual Com Port. The architecture of the