如何正确检查错误级别

Question

我有一个 Windows 批处理脚本，它以三种模式之一运行，具体取决于命令行参数的数量：

1 个命令行参数：播放命名的 .wav 文件

2 个命令行参数：运行第一个命令行参数指定的命令，然后播放第二个命令行参数指定的 .wav 文件

3 个命令行参数：运行第一个命令行参数指定的命令，然后播放通过第二个或第三个命令行参数指定的 .wav 文件，具体取决于命令是否成功

我的问题在于第三种模式：无论命令是否成功，脚本总是播放第一个声音。任何建议将不胜感激。

@ECHO OFF
Setlocal disableDelayedExpansion

:: OVERVIEW

:: This script optionally runs a command and then uses Eli Fulkerson's
:: `sounder.exe` to play the specified or default sound.

:: The Media environment variable must be defined and contain the path of a
:: folder containing one or more .wav files.


:: REFERENCE

:: https://www.elifulkerson.com/projects/commandline-wav-player.php


:: USAGE CASE 1: NO ARGUMENTS

:: If the script is invoked without arguments, it plays the default sound file
:: `beep-05.wav`.


:: USAGE CASE 2: ONE ARGUMENT

:: The single argument is the name of a sound file, minus the .wav extension.
:: sound.bat will play this sound file.  Example:

::    sound meow1


:: USAGE CASE 3: TWO ARGUMENTS

:: The first argument contains a command to be run; the second argument is the
:: name of a sound file, minus the .wav extension.  sound.bat will play the
:: sound after the command finishes running, regardless of exit code.  Example:

::    sound "dir C:\Phillip" meow1


:: USAGE CASE 4: THREE ARGUMENTS

:: The first argument contains a command to be run; the second and third
:: arguments name sound files, minus the .wav extension to be played if the
:: executes successfully or fails, respectively.

::    sound "dir C:\Phillip" meow1 meow2


:: NOTE

:: It is not currently possible to use this scripts to play sound files that are
:: located outside the Media folder.


:: AUTHOR

:: Phillip M. Feldman


:: REVISION HISTORY

:: June 5, 2020, Phillip M. Feldman: Initial version.


If not defined Media (
   msg "%username%" The Media environment variable is not defined!
   GOTO :EOF
)

If not EXIST %Media% (
   msg "%username%" The Media folder '%Media%' does not exist!
   GOTO :EOF
)


If '%1' == '' (

   :: No command-line arguments.
   sounder %Media%\beep-05.wav
   GOTO :EOF
)

If '%2' == '' (

   :: One command-line argument.
   sounder %Media%\%1%.wav
   GOTO :EOF
)

If '%3' == '' (

   :: Two command-line arguments.
   %~1
   sounder %Media%\%2%.wav
   GOTO :EOF
)

If '%4' == '' (

   :: Three command-line arguments.
   %~1

   If %ERRORLEVEL% == 0 (
      sounder %Media%\%2%.wav
   ) else (
      sounder %Media%\%3%.wav
   )
   GOTO :EOF
)

Answer 1

这是一个使用我在您自己的答案下通过评论提出的方法的示例，并包括一些额外的验证：

@Echo Off
SetLocal EnableExtensions DisableDelayedExpansion

Rem OVERVIEW
Rem This script optionally runs a command and then uses Eli Fulkerson's
Rem `sounder.exe` to play the specified or default sound.
Rem The Media environment variable must be defined and contain the path of a
Rem folder containing one or more .wav files.

Rem REFERENCE
Rem https://www.elifulkerson.com/projects/commandline-wav-player.php

Rem USAGE CASE 1: NO ARGUMENTS
Rem If the script is invoked without arguments, it plays the default sound file
Rem `beep-05.wav`.  Example:
Rem    sound

Rem USAGE CASE 2: ONE ARGUMENT
Rem The single argument is the name of a sound file, minus the .wav extension.
Rem sound.bat will play this sound file.  Example:
Rem    sound meow1

Rem USAGE CASE 3: TWO ARGUMENTS
Rem The first argument contains a command to be run; the second argument is the
Rem name of a sound file, minus the .wav extension. The sound will play upon
Rem completion of the command, regardless of its returned exit code.  Example:
Rem    sound "dir C:\Phillip" meow1

Rem USAGE CASE 4: THREE ARGUMENTS
Rem The first argument contains a command to be run; the second and third
Rem arguments name sound files, minus their .wav extensions, the first to be
Rem played if the command executes successfully and the second if it fails.
Rem Example:
Rem    sound "dir C:\Phillip" meow1 meow2

Rem NOTE
Rem It is not currently possible to use this script to play sound files which
Rem are located outside the Media folder.

Rem AUTHORS
Rem Phillip M. Feldman, Compo

Rem REVISION HISTORY
Rem June 8 2020, Compo: Improved version.
Rem June 5 2020, Phillip M. Feldman: Initial version.

Rem Validates the environment and input of no more than three arguments.
Set "$=0"
%__AppDir__%where.exe /Q sounder.exe && (If Not Defined Media (Set "$=16"
        %__AppDir__%msg.exe "%UserName%" The Media environment variable is not defined.
    ) Else For %%G In ("%Media%") Do If "%%~aG" Lss "d" (Set "$=8"
        %__AppDir__%msg.exe "%UserName%" The Media folder '%Media%' does not exist!
    ) Else %__AppDir__%where.exe /Q "%Media%":"*.wav" && (If Not "%~4"=="" (Set "$=2"
            %__AppDir__%msg.exe "%UserName%" Unexpected number of arguments.)) || (Set "$=4"
        %__AppDir__%msg.exe "%UserName%" There are no WAV files in '%Media%'.)) || (Set "$=32"
    %__AppDir__%msg.exe "%UserName%" Eli Fulkerson's sounder.exe was not found.)

If %$% NEq 0 Exit /B %$%

Rem Validates that the input .wav file names exist in the Media directory.
If Not "%~3"=="" (%__AppDir__%where.exe /Q "%Media%":"%~2.wav" || (Set "$=1"
        %__AppDir__%msg.exe "%UserName%" Sound file '%Media%\%~2' does not exist.)
    %__AppDir__%where.exe /Q "%Media%":"%~3.wav" || (Set "$=1"
        %__AppDir__%msg.exe "%UserName%" Sound file '%Media%\%~3' does not exist.)
) Else If Not "%~2"=="" (%__AppDir__%where.exe /Q "%Media%":"%~2.wav" || (Set "$=1"
        %__AppDir__%msg.exe "%UserName%" Sound file '%Media%\%~2' does not exist.)
) Else If Not "%~1"=="" (%__AppDir__%where.exe /Q "%Media%":"%~1.wav" || (Set "$=1"
        %__AppDir__%msg.exe "%UserName%" Sound file '%Media%\%~1' does not exist.)
) Else %__AppDir__%where.exe /Q "%Media%":"beep-05.wav" || (Set "$=1"
    %__AppDir__%msg.exe "%UserName%" Sound file '%Media%\beep-05.wav' does not exist.)

If %$% NEq 0 Exit /B %$%
Set "$="

Rem The commands to run if validation is successful.
If Not "%~3"=="" (%~1 2>NUL && (sounder.exe "%Media%\%~2.wav") || sounder.exe "%Media%\%~3.wav"
) Else If Not "%~2"=="" (%~1 2>NUL
    sounder.exe "%Media%\%~2.wav") Else If Not "%~1"=="" (sounder.exe "%Media%\%~1.wav"
) Else sounder.exe "%Media%\beep-05.wav"

GoTo :EOF

Answer 2

通过两个小改动，脚本（见下文）现在可以工作了。我要感谢所有帮助或试图提供帮助的人。

@ECHO OFF
Setlocal enableDelayedExpansion

:: OVERVIEW

:: This script optionally runs a command and then uses Eli Fulkerson's
:: `sounder.exe` to play the specified or default sound.

:: The Media environment variable must be defined and contain the path of a
:: folder containing one or more .wav files.


:: REFERENCE

:: https://www.elifulkerson.com/projects/commandline-wav-player.php


:: USAGE CASE 1: NO ARGUMENTS

:: If the script is invoked without arguments, it plays the default sound file
:: `beep-05.wav`.


:: USAGE CASE 2: ONE ARGUMENT

:: The single argument is the name of a sound file, minus the .wav extension.
:: sound.bat will play this sound file.  Example:

::    sound meow1


:: USAGE CASE 3: TWO ARGUMENTS

:: The first argument contains a command to be run; the second argument is the
:: name of a sound file, minus the .wav extension.  sound.bat will play the
:: sound after the command finishes running, regardless of exit code.  Example:

::    sound "dir C:\Phillip" meow1


:: USAGE CASE 4: THREE ARGUMENTS

:: The first argument contains a command to be run; the second and third
:: arguments name sound files, minus the .wav extension to be played if the
:: executes successfully or fails, respectively.

::    sound "dir C:\Phillip" meow1 meow2


:: NOTE

:: It is not currently possible to use this scripts to play sound files that are
:: located outside the Media folder.


:: AUTHOR

:: Phillip M. Feldman


:: REVISION HISTORY

:: June 5, 2020, Phillip M. Feldman: Initial version.


If not defined Media (
   msg "%username%" The Media environment variable is not defined!
   GOTO :EOF
)

If not EXIST %Media% (
   msg "%username%" The Media folder '%Media%' does not exist!
   GOTO :EOF
)


If '%1' == '' (

   :: No command-line arguments.
   sounder %Media%\beep-05.wav
   GOTO :EOF
)

If '%2' == '' (

   :: One command-line argument.
   sounder %Media%\%1%.wav
   GOTO :EOF
)

If '%3' == '' (

   :: Two command-line arguments.
   %~1
   sounder %Media%\%2%.wav
   GOTO :EOF
)

If '%4' == '' (

   :: Three command-line arguments.
   %~1

   If ERRORLEVEL 1 (
      sounder %Media%\%3%.wav
   ) else (
      sounder %Media%\%2%.wav
   )
   GOTO :EOF
)

Answer 3

替代方案：

If "%~4" == "" (

   :: Three command-line arguments.
   %~1

   If "%ERRORLEVEL%" == "0" (
      sounder "%Media%\%~2.wav"
   ) else (
      sounder "%Media%\%~3.wav"
   )
   GOTO :EOF
)

是使用&&（成功时）和|| （失败时）条件运算符：

(If Not "%~3" == "" %~1) && sounder "%Media%\%~2.wav" || sounder "%Media%\%~3.wav"