其实CMD里面变量的字符截取功能很实用，但是有的朋友还没有真正理解里面的规律，所以今天特意写了以下代码，希望对新手朋友理解CMD下面变量的字符截取功能有所帮助。
::code by lxmxn @ cn-dos.net .
::目的：帮助新手们更好的理解变量字符截取功能.
::Date 2006-12-16 .
::说明：有的变量截取之后值为空，这是正常的.
@echo off&setlocal EnableDelayedexpansion
::设置变量var的值：
set var=0123456789ABCDEF
call :begin
for /l %%a in (1,3,15) do (
for /l %%b in (1,4,15) do (
call :printf %%a %%b
)
)
call :begin
for /l %%a in (1,4,15) do (
for /l %%b in (-1,-3,-15) do (
call :printf %%a %%b
)
)
call :begin
for /l %%a in (-2,-3,-15) do (
for /l %%b in (1,4,15) do (
call :printf %%a %%b
)
)
call :begin
for /l %%a in (-1,-4,-15) do (
for /l %%b in (-2,-3,-15) do (
call :printf %%a %%b
)
)
pause
endlocal&cls&echo.
echo 演示结束了，任意键退出……
pause>nul
goto :eof
::输出结果：
:printf
echo %%var:~%1,%2%% 截取之后的字符为: !var:~%1,%2!
goto :eof
::清理屏幕：
:begin
echo\&pause&cls&echo.
echo 变量var的值为: %var%
echo.
goto :eof
点击这里下载附件(Getstr.rar)
[ Last edited by lxmxn on 2007-10-31 at 06:33 PM ]
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| 评分人 | 分数 | 时间 |
|---|---|---|
| ccwan | +5 | 2006-12-17 06:45 |
| zh159 | +5 | 2006-12-17 06:52 |
| redtek | +5 | 2006-12-17 21:20 |
| lianjiang2004 | +4 | 2006-12-17 21:30 |
| HUNRYBECKY | +5 | 2007-03-17 11:46 |
| qinbuer | +2 | 2007-06-01 02:03 |
| 26933062 | +4 | 2007-06-04 23:50 |
| zouzhxi | +4 | 2007-06-28 15:58 |
| fengjian | +1 | 2007-10-31 18:01 |
| upsco | +1 | 2007-11-21 21:18 |
| xiaohacker | +2 | 2007-12-23 20:32 |
| haiou327 | +4 | 2008-01-04 21:21 |
| 313885174 | +2 | 2008-01-26 12:34 |
| hy433124shc | +2 | 2008-02-20 19:14 |
| easonL | +2 | 2008-05-27 13:44 |
| dywjzh | -1 | 2008-09-09 11:43 |
| shifengl | +1 | 2009-05-21 08:38 |
| a7147125 | +1 | 2009-08-23 23:35 |
| mwm5 | +1 | 2009-10-17 20:49 |
| gool123456 | +1 | 2010-05-04 20:02 |
