You must override this function to enable printing and print preview.
你也能使用该函数去完成初始化，这依赖于打印设备的属性。
Printing chart - in the demo project you can preview and print the chart.
印刷图-在示范项目，您可以预览和打印图表。
Print, Print Preview, black and white printing, serial print, print dialog design.
说明：打印、打印预览、黑白打印、串行化打印、打印对话框设计。
It completes these three kinds of report forms' printing and the print preview at the function in advance.
它能够完成简单表、列表和主从表等三种格式报表的打印和打印预览功能。
It also introduces practical technique of print preview and realizes printing of complicated forms.
介绍一种打印预览实用技术，可实现复杂格式的输出。
It also introduces practical technique of print preview and realizes printing of complicated forms.
介绍一种打印预览实用技术，可实现复杂格式的输出。
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