【摘要】 通过对DWG实例文件的二进制剖析,重点研究了DWG文件的内部格式,包括其总体结构,以及各部分的组织方式。在具体数据类型方面还包括基本数据类型,扩展数据类型和三维信息等的内部表示方法。分析了其数据表示的不对齐,不定长,表示域大等特点。针对各种主要数据类型给出了相应的读取程序伪代码,还对读取所有对象给出了示例。更多还原

【Abstract】 This paper studies the internal format of R2000 DWG file through analyzing their binary code, including its general structure and format of each parts. Representation of basic data type, extended data type and 3D entities in R2000 DWG file are illustrated. The data are unaligned, of variable width, and very large figures can be represented. Example codes are given to get information from these data types, and even to extract all objects in a DWG file.更多还原