blocks|key|1990459|text|需要检查参数是否为空：if+"%25~1"==""+goto+blank|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1990460|完成此操作后，在-b：if+"%25~1"=="-b"+(goto+specific)+else+goto+unknown上执行if/else开关|1990461|使用引号将参数括起来，可以更轻松地检查空白/空/缺少参数等内容。"~“确保去掉双引号(如果它们位于命令行参数上)。|1990462|entityMap^0|B|N|0|B|1C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

You need to check for the parameter being blank: <code>if "%~1"=="" goto blank</code>

Once you've done that, then do an if/else switch on -b: <code>if "%~1"=="-b" (goto specific) else goto unknown</code>

Surrounding the parameters with quotes makes checking for things like blank/empty/missing parameters easier. "~" ensures double quotes are stripped if they were on the command line argument.

blocks|key|1776685|text|查看http://ss64.com/nt/if.html可以找到答案；命令是IF+[%251]==[]+GOTO+NO_ARGUMENT或类似命令。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1776686|entityMap|0|LINK|mutability|MUTABLE|url|http://ss64.com/nt/if.html^0|12|S|2|Q|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Look at <a href="http://ss64.com/nt/if.html">http://ss64.com/nt/if.html</a> for an answer; the command is <code>IF [%1]==[] GOTO NO_ARGUMENT</code> or similar.

blocks|key|1776723|text|您正在比较字符串。如果省略了参数，%251将扩展为空白，例如，命令将变为IF+=="-b"+GOTO+SPECIFIC+(这是一个语法错误)。用引号(或方括号)将字符串括起来。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1776724|REM+this+is+ok
IF+[%251]==[/?]+GOTO+BLANK

REM+I'd+recommend+using+quotes+exclusively
IF+"%251"=="-b"+GOTO+SPECIFIC

IF+NOT+"%251"=="-b"+GOTO+UNKNOWN|code-block|syntax|javascript|1776725|entityMap^0|H|2|Y|N|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You are comparing strings. If an arguments are omitted, <code>%1</code> expands to a blank so the commands become <code>IF =="-b" GOTO SPECIFIC</code> for example (which is a syntax error). Wrap your strings in quotes (or square brackets).

<pre><code>REM this is ok
IF [%1]==[/?] GOTO BLANK

REM I'd recommend using quotes exclusively
IF "%1"=="-b" GOTO SPECIFIC

IF NOT "%1"=="-b" GOTO UNKNOWN
</code></pre>

blocks|key|1776807|text|我最近一直在努力在批处理文件中实现复杂的参数开关，所以这是我的研究结果。提供的答案没有一个是完全安全的，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1776808|如果参数用引号括起来，则"%251"=="-?"将不匹配(文件名等需要)或者，如果参数用引号括起来并包含空格(同样经常出现在文件名中)，则会崩溃|offset|length|style|CODE|1776809|@ECHO+OFF
SETLOCAL
echo.
echo+starting+parameter+test...
echo.
rem+echo+First+parameter+is+%251
if+"%251"=="-?"+(echo+Condition+is+true,+param=%251)+else+(echo+Condition+is+false,+param=%251)
C:\>test.bat+-?

starting+parameter+test...

Condition+is+true,+param=-?

C:\>test.bat+"-?"

starting+parameter+test...

Condition+is+false,+param="-?"|code-block|syntax|javascript|1776810|如果参数在引号内有空格，则任何使用方括号[%251]==[-?]或[%25~1]==[-?]的组合都将失败：|1776811|@ECHO+OFF
SETLOCAL+
echo.
echo+starting+parameter+test...
echo.
echo+First+parameter+is+%251
if+[%25~1]==[-?]+(echo+Condition+is+true,+param=%251)+else+(echo+Condition+is+false,+param=%251)

C:\>test.bat+"long+file+name"

starting+parameter+test...

First+parameter+is+"long+file+name"
file+was+unexpected+at+this+time.|1776812|推荐的最安全的解决方案"%25~1"=="-?"将崩溃，因为它有一个复杂的参数，其中包括引号外的文本和引号内带空格的文本：|1776813|@ECHO+OFF
SETLOCAL+
echo.
echo+starting+parameter+test...
echo.
echo+First+parameter+is+%251
if+"%25~1"=="-?"+(echo+Condition+is+true,+param=%251)+else+(echo+Condition+is+false,+param=%251)

C:\>test.bat+-source:"long+file+name"

starting+parameter+test...

First+parameter+is+-source:"long+file+name"
file+was+unexpected+at+this+time.|1776814|确保涵盖上述所有场景的唯一方法是使用EnableDelayedExpansion，并使用变量通过引用(而不是通过值)传递参数。那么即使是最复杂的场景也能正常工作：|1776815|@ECHO+OFF
SETLOCAL+EnableDelayedExpansion
echo.
echo+starting+parameter+test...
echo.
echo+First+parameter+is+%251
::+we+assign+the+parameter+to+a+variable+to+pass+by+reference+with+delayed+expansion
set+"var1=%25~1"
echo+var1+is+!var1!
::+we+assign+the+value+to+compare+with+to+a+second+variable+to+pass+by+reference+with+delayed+expansion
set+"var2=-source:"c:\app+images"\image.png"
echo+var2+is+!var2!
if+"!var1!"=="!var2!"+(echo+Condition+is+true,+param=!var1!)+else+(echo+Condition+is+false,+param=!var1!)
C:\>test.bat+-source:"c:\app+images"\image.png

starting+parameter+test...

First+parameter+is+-source:"c:\app+images"\image.png
var1+is+-source:"c:\app+images"\image.png
var2+is+-source:"c:\app+images"\image.png
Condition+is+true,+param=-source:"c:\app+images"\image.png

C:\>test.bat+-source:"c:\app+images"\image1.png

starting+parameter+test...

First+parameter+is+-source:"c:\app+images"\image1.png
var1+is+-source:"c:\app+images"\image1.png
var2+is+-source:"c:\app+images"\image.png
Condition+is+false,+param=-source:"c:\app+images"\image1.png

C:\>test.bat+-source:"c:\app+images\image.png"

starting+parameter+test...

First+parameter+is+-source:"c:\app+images\image.png"
var1+is+-source:"c:\app+images\image.png"
var2+is+-source:"c:\app+images"\image.png
Condition+is+false,+param=-source:"c:\app+images\image.png"|1776816|entityMap|0|LINK|mutability|MUTABLE|url|https://ss64.com/nt/delayedexpansion.html^0|0|C|A|0|0|K|A|V|B|0|0|B|B|0|0|I|M|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1B|8|@$D|1C|E|1D|F|G]|$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1G|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1H|8|@$D|1I|E|1J|F|G]]|9|@]|A|$]]|$1|S|3|T|5|J|7|1K|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|1L|8|@]|9|@$D|1M|E|1N|1|1O]]|A|$]]|$1|W|3|X|5|J|7|1P|8|@]|9|@]|A|$K|L]]|$1|Y|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

I've been struggling recently with the implementation of complex parameter switches in a batch file so here is the result of my research. None of the provided answers are fully safe, examples:

<code>"%1"=="-?"</code> will not match if the parameter is enclosed in quotes (needed for file names etc.) or will crash if the parameter is in quotes and has spaces (again often seen in file names)

<pre><code>@ECHO OFF
SETLOCAL
echo.
echo starting parameter test...
echo.
rem echo First parameter is %1
if "%1"=="-?" (echo Condition is true, param=%1) else (echo Condition is false, param=%1)
C:\&gt;test.bat -?

starting parameter test...

Condition is true, param=-?

C:\&gt;test.bat "-?"

starting parameter test...

Condition is false, param="-?"
</code></pre>

Any combination with square brackets <code>[%1]==[-?]</code> or <code>[%~1]==[-?]</code> will fail in case the parameter has spaces within quotes:

<pre><code>@ECHO OFF
SETLOCAL 
echo.
echo starting parameter test...
echo.
echo First parameter is %1
if [%~1]==[-?] (echo Condition is true, param=%1) else (echo Condition is false, param=%1)

C:\&gt;test.bat "long file name"

starting parameter test...

First parameter is "long file name"
file was unexpected at this time.
</code></pre>

The proposed safest solution <code>"%~1"=="-?"</code> will crash with a complex parameter that includes text outside the quotes and text with spaces within the quotes:

<pre><code>@ECHO OFF
SETLOCAL 
echo.
echo starting parameter test...
echo.
echo First parameter is %1
if "%~1"=="-?" (echo Condition is true, param=%1) else (echo Condition is false, param=%1)

C:\&gt;test.bat -source:"long file name"

starting parameter test...

First parameter is -source:"long file name"
file was unexpected at this time.
</code></pre>

The only way to ensure all above scenarios are covered is to use <a href="https://ss64.com/nt/delayedexpansion.html" rel="nofollow noreferrer">EnableDelayedExpansion</a> and to pass the parameters by reference (not by value) using variables. Then even the most complex scenario will work fine:

<pre><code>@ECHO OFF
SETLOCAL EnableDelayedExpansion
echo.
echo starting parameter test...
echo.
echo First parameter is %1
:: we assign the parameter to a variable to pass by reference with delayed expansion
set "var1=%~1"
echo var1 is !var1!
:: we assign the value to compare with to a second variable to pass by reference with delayed expansion
set "var2=-source:"c:\app images"\image.png"
echo var2 is !var2!
if "!var1!"=="!var2!" (echo Condition is true, param=!var1!) else (echo Condition is false, param=!var1!)
C:\&gt;test.bat -source:"c:\app images"\image.png

starting parameter test...

First parameter is -source:"c:\app images"\image.png
var1 is -source:"c:\app images"\image.png
var2 is -source:"c:\app images"\image.png
Condition is true, param=-source:"c:\app images"\image.png

C:\&gt;test.bat -source:"c:\app images"\image1.png

starting parameter test...

First parameter is -source:"c:\app images"\image1.png
var1 is -source:"c:\app images"\image1.png
var2 is -source:"c:\app images"\image.png
Condition is false, param=-source:"c:\app images"\image1.png

C:\&gt;test.bat -source:"c:\app images\image.png"

starting parameter test...

First parameter is -source:"c:\app images\image.png"
var1 is -source:"c:\app images\image.png"
var2 is -source:"c:\app images"\image.png
Condition is false, param=-source:"c:\app images\image.png"
</code></pre>

My OS is Windows Vista. I need to have a ".bat" file where I need to check if user enters any command-line parameter or not. If does then if the parameter equals to <code>-b</code> then I will do something otherwise I will flag "Invalid input". If user does not enter any command-line parameter then I will do something. I have created following .bat file. It works for <code>-b</code> and not-equal to <code>-b</code> cases - but it fails when user does not pass any command-line parameter.

I always get error:

<pre><code>GOTO was unexpected at this time.
</code></pre>

Can anyone tell me what am I doing wrong here?

<hr>

<pre><code>ECHO OFF
CLS
ECHO.

IF [%1]==[/?] GOTO BLANK

IF %1=="-b" GOTO SPECIFIC

IF NOT %1=="-b" GOTO UNKNOWN

:SPECIFIC

ECHO SPECIFIC

GOTO DONE

:BLANK

ECHO No Parameter

GOTO DONE

:UNKNOWN

ECHO Unknown Option

GOTO DONE

:DONE

ECHO Done!
</code></pre>

How to check command line parameter in ".bat" file?

Windows

我的操作系统是Windows Vista。我需要有一个".bat“文件，用来检查用户是否输入了任何命令行参数。如果是，那么如果参数等于-b，那么我将做一些事情，否则我将标记为"Invalid input“。如果用户没有输入任何命令行参数，那么我将执行一些操作。我已经创建了下面的.bat文件。它适用于-b，但不等同于-b情况，但当用户不传递任何命令行参数时，它将失败。我总是收到错误：GOTO was

问如何检查".bat“文件中的命令行参数？
EN

回答 4

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问如何检查".bat“文件中的命令行参数？EN

回答 4

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问如何检查".bat“文件中的命令行参数？
EN