Win bat文件:如何将前导零添加到for循环中的变量？

Question

非常简单,我猜...我需要通过向下面的循环索引变量(%% i)添加前导零来获得可用变量.

@echo off
for /L %%i in (1, 1, 5) do (
     echo %%i

     rem     How to create a variable j here as a 
     rem     result of adding leading zeros to %%i? (001, 002, 003 etc.)

)
pause

怎么样？我已经尝试了以下内容,但是我无法从%% i变量中获取值.在var_ at ...

@echo off & setlocal enableextensions
for /L %%i in (1, 1, 5) do (
     echo %%i
     set var_=00000%%i
     set var_=%var_:~-5%
     echo %var_%
)
pause

Answer 1

用零前缀字符串,然后从右侧获取所需的字符数:

@echo off
set count=5
setlocal EnableDelayedExpansion

for /L %%i in (1, 1, %count%) do (
     set "formattedValue=000000%%i"
     echo !formattedValue:~-3!
)

输出:

001
002
003
004
005

Answer 2

使用setlocal enabledelayedexpansion,解决方案是:

@echo off
setlocal ENABLEDELAYEDEXPANSION
set count=5

for /L %%i in (1, 1, %count%) do (
     echo %%i
     set j=00%%i
  rem to display intermediate values inside loop, surround with !
     echo !j!
)
endlocal

这是一个很好的参考:http://blog.crankybit.com/why-that-batch-for-loop-isnt-working/