【摘要】 本文介绍了安装程序的用途及其面向对象的编程技术和压缩原理 ,讨论了LZ77压缩解压算法的数据结构及实现机制 ,提出了用自适应字典压缩在Ddlphi 4环境下开发实用压缩解压安装的具体过程和技术特点。基于字典的数据压缩方案使用独立的代码替换符号串 ,字典的建立可分为静态和自适应两种方式 ,本文使用了后一种方案 ,不断将旧符号组替换为新的符号组 ,压缩率高更多还原

【Abstract】 The usage of installation software,object-oriented Programming techniques and the rundamental of compression are introduced. The data structure and implement of compression and expansion algorithm LZ77 are discussed.The usage of self-adapting dictionary compression in practical installation xoftware in Delphi environment and its processing techniques are put forward.In data compression based on dictionary.There are static and self-adaptive dictionary creating ways and the latter is used in this paper.It is of high efficiency that old symbol group is replaced by new group frequently.更多还原