说明：  通过MFC来完成打印作业有很多的方法，应用场合也有所不同。可以直接利用MFC封装的打印对话框CPrintDialog来执行简单的打印任务。
(through MFC completed print jobs to a lot of methods, applications are also different. Direct access MFC Packaging CPrintDialog the Print dialog box to print simple task.)