7z压缩接口封装成控件（内存加载7Z.DLL 无需安装7Z和 7Z.DLL） 内存封装了 7z.dll 无需安装 7z 无需 7z.dll 支持文件压缩 和文件夹压缩 采用线程池压缩和解压缩技术 -7z compression interface, packaged into control (no need to install memory load 7Z.DLL 7Z and 7Z.DLL) memory encapsulates 7z.dll no 7z.dll w