//譬如 %WINDIR% 是表示系统目录的系统变量, 可以这样获取:var s: string;begin s := GetEnvironmentVariable('WINDIR'); ShowMessage(s); {C:\WINDOWS}end; %WINDIR% {系统目录 - C:\WINDOWS}%SYSTEMROOT% {系统目录 - C:\WINDOWS}%SYSTEMDRIVE% {系统根目录 - C:}%HOMEDRIVE% {当前用户根目录 - C:}%USERPROFILE% {当前用户目录 - C:\Documents and Settings\wy}%HOMEPATH% {当前用户路径 - \Documents and Settings\wy}%TMP% {当前用户临时文件夹 - C:\DOCUME~1\wy\LOCALS~1\Temp}%TEMP% {当前用户临时文件夹 - C:\DOCUME~1\wy\LOCALS~1\Temp}%APPDATA% {当前用户数据文件夹 - C:\Documents and Settings\wy\Application Data}%PROGRAMFILES% {程序默认安装目录 - C:\Program Files}%COMMONPROGRAMFILES% {文件通用目录 - C:\Program Files\Common Files}%USERNAME% {当前用户名 - wy}%ALLUSERSPROFILE% {所有用户文件目录 - C:\Documents and Settings\All Users}%OS% {操作系统名 - Windows_NT}%COMPUTERNAME% {计算机名 - IBM-B63851E95C9}%NUMBER_OF_PROCESSORS% {处理器个数 - 1}%PROCESSOR_ARCHITECTURE% {处理器芯片架构 - x86}%PROCESSOR_LEVEL% {处理器型号 - 6}%PROCESSOR_REVISION% {处理器修订号 - 0905}%USERDOMAIN% {包含用户帐号的域 - IBM-B63851E95C9}%COMSPEC% {C:\WINDOWS\system32\cmd.exe}%PATHEXT% {执行文件类型 - .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.pyo;.pyc;.py;.pyw}%PATH% {搜索路径} 另外, 可以利用 .. 到上层目录, 如: var s: string;begin s := GetCurrentDir; ShowMessage(s); {C:\Documents and Settings\wy\My Documents\RAD Studio\Projects} SetCurrentDir('..'); s := GetCurrentDir; ShowMessage(s); {C:\Documents and Settings\wy\My Documents\RAD Studio} SetCurrentDir('..\..'); s := GetCurrentDir; ShowMessage(s); {C:\Documents and Settings\wy}end;