vb使用EXCEL的控件文章；通过控制EXCEL可以生成相关的电子表格文件，实现打印预览、打印等功能-vb controls the use of EXCEL article can be generated by controlling the EXCEL spreadsheet related documents, to achieve print preview, print and other functions

改程序封装了三个类，利用这三个类可以轻松利用VC++实现打印和打印预览功能(Change the program encapsulates three classes, the use of these three classes can easily use VC++ to achieve print and print preview function)