代码说明： 用文本和图画模式打印，输出文件 TEtvPrinter and auxiliary components. Printing in the text and graphics mode, output to the file, page setup, numbering, fonts choice, including text mode, line spacing and etc. Package also contains multi-function popup menus of data-aware controls for design- and run-time; automatic opening/refreshing datasets in run-time; other functions

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