Can't enter a variable in DOS

问题

I'm trying to run a batch file in vDOS (DOS emulator), where I want the user to input two variables. Every time I run the file, it doesn't let me enter the variables.

SET /P in=Input:
SET /P out=Output:

What I expected to happen was that It'd let me enter the input for the variables. Instead, it executes both of the commands as they are (without letting me enter the input).

回答1:

Windows cmd and MS-DOS are very different things and one of the differences is the set command. In MS-DOS the only form of set is set variable=value. There are neither set /A, set "variable=value" nor set /P.

set /P is a feature of Windows NT's cmd.exe. In DOS you must use 3^rd party software to get user input and store in a variable. Here are some solutions

SENVAR.COM
```
SENVAR INPUT Input string:
```
EDITVAR and CHOOSE
```
editvar -p "Input string: " INPUT
```

FC.COM

@echo off
:: based on batch from PC Magazine June 27, 1995 page 248
:: this version puts temps in C:\DOS dir and shortens var names
:: User input is returned in variable STR
:input
> C:\DOS\en#er.bat fc con nul /lb1 /n|date|find "    1:  "
> C:\DOS\enter.bat echo set str=
>>C:\DOS\enter.bat echo :loop
>>C:\DOS\enter.bat echo if not '%%str%%==' set str=%%str%% %%5
>>C:\DOS\enter.bat echo if '%%str%%==' set str=%%5
>>C:\DOS\enter.bat echo shift
>>C:\DOS\enter.bat echo if not '%%5==' goto loop
call en#er.bat
del C:\DOS\enter.bat
del C:\DOS\en#er.bat

ANSI.SYS

@ECHO OFF

REM * Ask for USeR INPUT and store it in variable USRINPUT
REM * Assumes ANSI.SYS is loaded
REM * Written by Rob van der Woude

SET USRINPUT=

REM * Turn on ANSI key translation (translate Enter
REM * key to F6+Enter sequence) and ask for input:
ECHO ←[13;0;64;13pEnter one word only . . .

REM * Copy entered text to temporary file:
COPY CON %TEMP%.\~USRINP.TMP

REM * Turn off ANSI key translation and clear irrelevant screen output:
ECHO ←[13;13p←[3A←[K←[1B←[K←[1B←[K←[2A

REM * Add empty line to temporary file. The empty line
REM * will be used to stop DATE asking for new date.
ECHO.>> %TEMP%.\~USRINP.TMP
ECHO.>> %TEMP%.\~USRINP.TMP


REM * Create a temporary batch file that will store the
REM * entered text into the environment variable USRINPUT:
TYPE %TEMP%.\~USRINP.TMP | DATE | FIND "):" > %TEMP%.\~USRINP.BAT

REM * Create more temporary batch files. Add
REM * more command line parameters if necessary,
REM * as in: ECHO SET USRINPUT=%%3 %%4 %%5 %%6 %%7 %%8 %%9>CURRENT.BAT
ECHO SET USRINPUT=%%3>CURRENT.BAT

REM * VOER.BAT and TYP.BAT are replacements for CURRENT.BAT for Dutch
REM * DOS versions; add your own language versions if necessary:
ECHO SET USRINPUT=%%6>VOER.BAT
ECHO SET USRINPUT=%%4>TYP.BAT

REM * This temporary batch file now sets the variable USRINPUT:
CALL %TEMP%.\~USRINP.BAT

REM * Display the result:
ECHO You typed: ←[1m%USRINPUT%&larr;[0m
ECHO.
PAUSE

REM * Finally, clean up the mess of temporary files:
FOR %%A IN (%TEMP%.\~USRINP.BAT %TEMP%.\~USRINP.TMP VOER.BAT TYP.BAT CURRENT.BAT) DO DEL %%A

The ← is the escape character (27h)

In case you just want to get simple answers like Y/N then CHOICE.COM is designed for that purpose