此代码用于从CAD所生成的DXF文件中提取所需的实体数据，该数据是来完成自动编程系统的关键数据。-for this code generated from the CAD DXF files from the data entities, The data is to complete the automatic programming system critical data.

自动提取cad图中字体软件,可以用于图纸批量选择字体，用于编辑-Automatic extraction of cad diagram font software, can be used for drawing the batch select font, for editing