用方括号代替引号:

IF [%1] == [] GOTO MyLabel

圆括号是不安全的:只能使用方括号。

This way looks correct:

if "%~1" == "" if [%1] == [] echo Argument 1 is really empty.

First filter (if "%~1" == "") из safe way to detect argument is empty or "".
Second filter (if [%1] == []) will skip "" argument.
Remember we have two kind of empty arguments : really empty (nothing) and empty quotes "".
We have to detect both.

Next code takes all arguments "as is" in variable args:

:GetArgs
set args=%1
:ParseArgs
shift /1
if "%~1" == "" if [%1] == [] goto :DoneArgs
set args=%args% %1
goto :ParseArgs
:DoneArgs
if not defined args echo No arguments
if defined args echo Aguments are: %args%

This code correctly process "normal" arguments (simple words, "multiword phrases" or "") with balanced quotes.
Quoted arguments can even contain special chars like "a & b".
But it is still can fail with "abnormal" expressions with unbalanced quotes (do not use them).

最好的半解决方案之一是将%1复制到一个变量中，然后使用延迟展开，如delayedxp。对于任何内容总是安全的。

set "param1=%~1"
setlocal EnableDelayedExpansion
if "!param1!"=="" ( echo it is empty )
rem ... or use the DEFINED keyword now
if defined param1 echo There is something

这样做的好处是处理param1是绝对安全的。

param1的设置将在许多情况下工作，如

test.bat hello"this is"a"test
test.bat you^&me

但它仍然失败于一些奇怪的内容，比如

test.bat ^&"&

才能得到100%的正确答案

它检测%1是否为空，但对于某些内容，它无法获取内容。 这对于区分空%1和有""的%1也是有用的。 它使用CALL命令的能力在不中止批处理文件的情况下失败。

@echo off
setlocal EnableDelayedExpansion
set "arg1="
call set "arg1=%%1"

if defined arg1 goto :arg_exists

set "arg1=#"
call set "arg1=%%1"
if "!arg1!" EQU "#" (
    echo arg1 exists, but can't assigned to a variable
    REM Try to fetch it a second time without quotes
    (call set arg1=%%1)
    goto :arg_exists
)

echo arg1 is missing
exit /b

:arg_exists
echo arg1 exists, perhaps the content is '!arg1!'

如果你想100%防弹获取内容，你可以阅读如何接收甚至是最奇怪的命令行参数?

从IF /?：

如果命令扩展是启用If 变更如下: IF [/I] string1 compare-op string2命令 IF CMDEXTVERSION编号命令 IF定义变量命令 ．．．．．． DEFINED条件刚好 像EXISTS一样，除了它需要一个 环境变量名称和返回值 如果环境变量为，则为 定义的。

空字符串是一对双引号/""，我们可以直接测试长度:

set ARG=%1
if not defined ARG goto nomore

set CHAR=%ARG:~2,1%
if defined CHAR goto goon

然后用双引号测试它的2个字符:

if ^%ARG:~1,1% == ^" if ^%ARG:~0,1% == ^" goto blank
::else
goto goon

这里有一个您可以使用的批处理脚本。我觉得它正好接住了空弦。

这只是一个例子，你只需要根据你的脚本定制上面的2(或3?)步骤。

@echo off
if not "%OS%"=="Windows_NT" goto EOF
:: I guess we need enableExtensions, CMIIW
setLocal enableExtensions
set i=0
set script=%0

:LOOP
set /a i=%i%+1

set A1=%1
if not defined A1 goto nomore

:: Assumption:
:: Empty string is (exactly) a pair of double-quotes ("")

:: Step out if str length is more than 2
set C3=%A1:~2,1%
if defined C3 goto goon

:: Check the first and second char for double-quotes
:: Any characters will do fine since we test it *literally*
if ^%A1:~1,1% == ^" if ^%A1:~0,1% == ^" goto blank
goto goon

:goon
echo.args[%i%]: [%1]
shift
goto LOOP

:blank
echo.args[%i%]: [%1] is empty string
shift
goto LOOP

:nomore
echo.
echo.command line:
echo.%script% %*

:EOF

酷刑测试结果:

.test.bat :: ""  ">"""bl" " "< "">"  (")(") "" :: ""-"  " "( )"">\>" ""
args[1]: [::]
args[2]: [""] is empty string
args[3]: [">"""bl" "]
args[4]: ["< "">"]
args[5]: [(")(")]
args[6]: [""] is empty string
args[7]: [::]
args[8]: [""-"  "]
args[9]: ["( )"">\>"]
args[10]: [""] is empty string

command line:
.test.bat :: ""  ">"""bl" " "< "">"  (")(") "" :: ""-"  " "( )"">\>" ""

用方括号代替引号:

IF [%1] == [] GOTO MyLabel

圆括号是不安全的:只能使用方括号。