Principle: Similar to the principle of converting Word and PPT into PDF format, install the PDF virtual printer driver, then select the PDF virtual printer in the Superstar browser, and then specify the storage destination and file name. In fact, many softwares can realize the function of PDF virtual printer, so there are various solutions: A: Install adobe acrobat standard and Superstar Viewer. 1. Set the printer, rename the printer to adobe pdf, and set it as the default printer. 2. Calculate the number of pdg files in the pdg book folder you want to convert, which corresponds to the number of pages you later convert into pdf files. 3. Open the pdg book you want to convert with a superstar reader and turn to the homepage interface, usually the cover. 4. Right-click to print, fill in the number of pages to be printed, click OK to pop up the printer selection interface, select pdffffff, press the print button, and a dialog box will appear to save the file, name it, select the path, and then click Save to start creation. B: PDFFactory converted the superstar format into pdf format. After installation, it will be printed in Superstar with pdfFactory's "printer", and the operation is similar to that of A..C: CutePDF Writer, which provides convenient PDF printing function. Whether you are looking at a web page or various documents, as long as they can be printed by a printer, CutePDF Writer can "print" them into PDF format, which is convenient for reading documents and files on various computer platforms. D: If office2003 is installed, you will find a printer named "Microsoft Office Document Image Writer" added to the list of printers in the print dialog box. If you choose this option to print, you will get a file with MDI extension. The virtual printing function of this printer is the same as that of Adobe Acrobat, but because it comes from Microsoft, its compatibility should be better. Open the superstar reader, open the book to be converted, open the toolbar | Book | Print, select the starting and ending page numbers, press ok, set the Microsoft Office Document Image Writer as a printer, press ok, the save document as dialog box pops up, write the file name, select the archive path, and press OK to start the conversion. After the conversion, a permanent e-book is completed, and the conversion speed is very fast.