batch-file - 批处理文件调用 %~1 并获取变量的当前值/字符串

Question

下面的代码与批处理文件(命令提示符)有关。我的问题是代码中说 current value is %~1 的部分实际上并没有显示 %~1 的值(我想说 string01 或string02) 我不太清楚该怎么做。我环顾四周，但无法解决这个简单的问题。

@echo off 
goto :MainFunction 

:Func01 
echo. 
echo Running Func01 
echo Variable %~1 current value is %~1 
echo. 
echo Set new value for Variable %~1: 
set /p %~1= 
goto :eof 

:MainFunction 
echo This is the main function! 
set Var01=string01 
set var02=string02 
echo Var01 is equal to %Var01% 
echo Var02 is equal to %Var02% 
call :Func01 Var01 
call :Func01 Var02 
echo Var01 is now equal to %Var01% 
echo Var02 is now equal to %Var02% 
goto :eof 

Answer 1

您想在单个参数中同时获取变量名和值吗？

在行 echo Variable %~1 current value is %~1 中，必须评估第二个 %~1。所以需要另一层解析。 “通常”的方法是使用 delayed expansion :

@echo off 
setlocal enabledelayedexpansion
goto :MainFunction 

:Func01 
echo. 
echo Running Func01 
echo Variable %~1 current value is !%~1! 
echo. 
echo Set new value for Variable %~1: 
set /p %~1= 
goto :eof 

:MainFunction 
echo This is the main function! 
set Var01=string01 
set var02=string02 
echo Var01 is equal to %Var01% 
echo Var02 is equal to %Var02% 
call :Func01 Var01 
call :Func01 Var02 
echo Var01 is now equal to %Var01% 
echo Var02 is now equal to %Var02% 
goto :eof