设置/p 空答案崩溃 [英] set /p empty answer crash

问题描述

我是新来的，所以我会尽力做到最好.

i am new here so i'll try to be as good as i can.

所以我正在尝试制作一个基于基于文本的 MS-DOS 的 RPG，而且我做得很好，因为我刚刚看到如果用户在 set/p 处输入无效输入，例如空答案(只需按下输入)或不在IF"上的答案，批处理就会崩溃，我想解决这个问题，这样它就不会那么崩溃了.

So i am trying to make a RPG based on text-based MS-DOS, and i am going pretty well as i just saw that if the user puts an invalid input at set /p, like an empty answer (just pressing enter) or an answer which is not on the "IF", the batch just crashes, and I would like to fix that so it will be less crashy.

这是我要修复的部分之一:

Here is one of the parts i'd like to fix:

@echo off
title "Wasteland Adventure"
color 0A
cls
:Menu
cls
echo.
echo.
echo Welcome to Wasteland Adventure
echo.
echo To start a new game, type NEW and press ENTER.
echo To see instructions for the game, type INSTRUCTIONS and press ENTER.
echo To quit, type QUIT and press ENTER.
set input=
set /p input=What do you want to do? 
if %input%==new goto INTRO
if %input%==instructions goto INSTRUCTIONS
if %input%==quit goto EXIT

提前致谢

推荐答案

不是set/p崩溃了，而是:

if %input%==new 

如果 %input% 为空，则解析为:

if %input% is empty, this is parsed as:

if ==new 

显然是语法错误.为避免这种情况，请使用:

obviously a syntax error. To avoid this, use:

if "%input%"=="new"

一个空的输入会被解析为:

An empty input will then be parsed as:

if ""=="new"

效果很好.

当变量只包含空格和/或制表符时也是如此:

The same applies when the variable contains only spaces and/or tabs:

if == new(语法错误)与 if ""== 新"(运行良好)

if == new (syntax error) versus if " " == "new" (running fine)

完整代码如下:

:Menu
set input=
set /p input=What do you want to do? 
if "%input%"=="new" goto INTRO
if "%input%"=="instructions" goto INSTRUCTIONS
if "%input%"=="quit" goto EXIT
REM for any other (invalid) input:
goto :Menu

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