How to use special characters in choice command - Batch File

Question

I would like to add special characters like < | into my choice command, how can I do that?

Here's my old code:

CHOICE /C ABCDEFGHIJKLMNOPQRSTUVWXYZ0134567928 /N /M "Press 8 ...."

and I would like it to be something like :

CHOICE /C `~,.<>?ABCDEFGHIJKLMNOPQRSTUVWXYZ0134567928 /N /M "Press 8 ...."

Any help will be appreciated, thanks.

EDIT: Since some of you may ask why do I need so many choice, I'm here to answer. It is because pressing an invalid choice would give you an annoying beep that I would not like. Therefore I asked this question.

Answer 1

The CHOICE command only allows alpha-numeric characters, as well as extended ASCII characters with decimal byte codes between 128-254.

I have written a pure batch substitute for CHOICE based on a hack that uses REPLACE. My :getKey routine can accept most any character, and allows you to specify the allowed characters, and it puts the captured character in a variable of your choosing - much more convenient than messing with ERRORLEVEL.

I originally posted the routine at http://www.dostips.com/forum/viewtopic.php?f=3&t=7396. The link also has a more complicated routine that can read absolutely any key value, including NULL, as well as a routine that allows input of a masked string (displays asterisks for each character).

Below is the :getKey routine, along with an example showing usage. Remove the /I switch if you want the keys to be case sensitive. Full documentation is embedded within the script.

Edit - I've updated the code to version 2.0 with the ability to specify a prompt, and to have the valid key list be case sensitive. The only CHOICE feature that cannot be emulated is a timeout option with a default response. I don't see any reasonable way to ever provide a timeout option.

@echo off
setlocal enableDelayedExpansion

set "valid=0`~,.<>?ABCDEFGHIJKLMNOPQRSTUVWXYZ0134567928"
call :getKey /p "Press 8 ...." key valid /i
echo(
echo You pressed !key!
exit /b

::getKey  [/P "Prompt"]  KeyVar  [ValidVar [/I]]
::
:: Read a keypress representing a character between 0x00 and 0xFF and store the
:: value in variable KeyVar. Null (0x00), LineFeed (0x0A), and Carriage Return
:: (0x0D) will result in an undefined KeyVar. On Windows 10, Ctrl-Z (0x1A) will
:: also result in an undefined KeyVar. The simplest way to get an undefined
:: KeyVar is to press the [Enter] key.
::
:: The optional /P parameter is used to specify a "Prompt" that is written to
:: stdout, without a newline. Also, the accepted character is ECHOed after the
:: prompt if the /P option was used.
::
:: The optional ValidVar parameter defines the values that will be accepted.
:: If the variable is not given or not defined, then all characters are accepted.
:: If given and defined, then only characters within ValidVar are accepted. The
:: first character within ValidVar should either be 0, meaning ignore undefined
:: KeyVar, or 1, meaning accept undefined KeyVar. The remaining characters
:: represent themselves. For example, a ValidVar value of 0YN will only accept
:: uppercase Y or N. A value of 1YN will additionally accept [Enter] etc.
::
:: If ValidVar is followed by the optional /I switch, then case of standard
:: English letters is ignored. The case of the pressed key is preserved in
:: the result, but English letters A-Z and a-z are not rejected due to case
:: differences when the /I switch is added.
::
:: Any value (except null) may be entered by holding the [Alt] key and pressing
:: the appropriate decimal code on the numeric keypad. For example, holding
:: [Alt] and pressing numeric keypad [1] and [0], and then releasing [Alt] will
:: result in a LineFeed.
::
:: The only way to enter a Null is by holding [Ctrl] and pressing the normal [2]
::
:: An alternate way to enter control characters 0x01 through 0x1A is by holding
:: the [Ctrl] key and pressing any one of the letter keys [A] through [Z].
:: However, [Ctrl-A], [Ctrl-F], [Ctrl-M], and [Ctrl-V] will be blocked on Win 10
:: if the console has Ctrl key shortcuts enabled.
::
:: This function works properly regardless whether delayed expansion is enabled
:: or disabled.
::
:: :getKey version 2.0 was written by Dave Benham, and originally posted at
:: http://www.dostips.com/forum/viewtopic.php?f=3&t=7396
::
:: This work was inspired by posts from carlos and others at
:: http://www.dostips.com/forum/viewtopic.php?f=3&t=6382
::
:getKey
setlocal disableDelayedExpansion
if /i "%~1" equ "/P" (
  <nul set /p ^"=%2"
  shift /1
  shift /1
  set "getKey./P=1"
) else (
  set "getKey./P="
)
:getKeyRetry
(
  endlocal&setlocal disableDelayedExpansion
  (for /f skip^=1^ delims^=^ eol^= %%A in ('replace.exe ? . /u /w') do for /f delims^=^ eol^= %%B in ("%%A") do (
    endlocal
    if "%%B" equ "" (set "%1=^!") else set "%1=%%B"
    setlocal enableDelayedExpansion
  )) || (
    endlocal
    set "%1="
    setlocal enableDelayedExpansion
  )
  set "getKey./P=%getKey./P%"
  if defined %1 (set "getKey.key=!%1!") else set "getKey.key=x"
)
(
  if "!%2!" neq "" (
    if defined %1 (
      set "getKey.mask=!%2:~1!"
      if not defined getKey.mask goto :getKeyRetry
      if /i "%~3" equ "/I" (
        if "!%1!" equ "=" (
          set "getKey.mask=a!getKey.mask!"
          for /f "delims=" %%A in ("!getKey.mask!") do if /i "!getKey.mask:%%A=%%A!" equ "!getKey.mask!" goto :getKeyRetry
        ) else for /f delims^=^ eol^= %%A in ("!%1!") do if "!getKey.mask:*%%A=!" equ "!getKey.mask!" goto :getKeyRetry
      ) else (
        for /f tokens^=1*^ eol^=^%getKey.key%^ delims^=^%getKey.key% %%A in ("!getKey.mask!!getKey.mask!") do if "%%B" equ "" goto :getKeyRetry
      )
    ) else if "!%2:~0,1!" equ "0" goto :getKeyRetry
  )
  if defined getKey./P echo(!%1!
  exit /b
)