Windows (cmd) 批处理 - 在子例程中使用括号

问题描述 投票：0回答：1

我经常看到

( ... )
中括号
:LABEL
的示意图。

我阅读了括号/方括号，但我不太明白如何在子例程中解释它。
（例如https://ss64.com/nt/syntax-brackets.html）

在括号内使用变量
CMD shell 将扩展[读入内存]代码块开头的所有变量并使用这些值，即使变量的值在代码块内发生更改也是如此。打开 DelayedExpansion 将强制 shell 在每一行的开头读取变量。

不幸的是，我在互联网上找不到调用或子例程的具体描述。
（例如 https://ss64.com/nt/call.html，https://ss64.com/nt/syntax-functions.html）

我想知道它是否只是一种代码风格（例如为了可读性），这是我目前的猜测。

一个简单的例子：

@ECHO OFF

CALL :ShortLabel
CALL :LongLabel
GOTO :EndOfBatch

:ShortLabel
ECHO I'm called "%~0" .
EXIT /B

:LongLabel
(
   ECHO I'm called "%~0" , because I have two extra lines.
   EXIT /B
)

:EndOfBatch
PAUSE
EXIT /B

如果没有，我希望有一个简短的解释。

更新：

由于我之前的“时间测量”很垃圾，所以这里有一个更好的版本（我希望）。第一个调用只是从第二个调用的括号中复制粘贴：

@ECHO OFF

SETLOCAL EnableExtensions EnableDelayedExpansion

REM *** This string has the maximum length of 8191
set "str=."
FOR /L %%n in (1 1 13) DO SET "str=!str:~-4000!!str:~-4000!"
(set^ string=!str!!str:~-191!)

SET /A Loops=3000

TITLE A - StrLenNoLocal
CALL :TimeStamp StrLenNoLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocal LenDummyStrLenNoLocalA string %%a
CALL :TimeStamp StrLenNoLocalEnd

TITLE A - StrLenNoLocalBrackets
CALL :TimeStamp StrLenNoLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocalBrackets LenDummyStrLenNoLocalBracketsA string %%a
CALL :TimeStamp StrLenNoLocalBracketsEnd

TITLE A - StrLenLocal
CALL :TimeStamp StrLenLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocal LenDummyStrLenLocalA string %%a
CALL :TimeStamp StrLenLocalEnd

TITLE A - StrLenLocalBrackets
CALL :TimeStamp StrLenLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocalBrackets LenDummyStrLenLocalBracketsA string %%a
CALL :TimeStamp StrLenLocalBracketsEnd

CALL :MeasureTime StrLenNoLocalTime StrLenNoLocalStart StrLenNoLocalEnd
CALL :MeasureTime StrLenNoLocalBracketsTime StrLenNoLocalBracketsStart StrLenNoLocalBracketsEnd
CALL :MeasureTime StrLenLocalTime StrLenLocalStart StrLenLocalEnd
CALL :MeasureTime StrLenLocalBracketsTime StrLenLocalBracketsStart StrLenLocalBracketsEnd

REM Invert order

TITLE B - StrLenLocalBrackets
CALL :TimeStamp StrLenLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocalBrackets LenDummyStrLenLocalBracketsB string %%a
CALL :TimeStamp StrLenLocalBracketsEnd

TITLE B - StrLenLocal
CALL :TimeStamp StrLenLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocal LenDummyStrLenLocalB string %%a
CALL :TimeStamp StrLenLocalEnd

TITLE B - StrLenNoLocalBrackets
CALL :TimeStamp StrLenNoLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocalBrackets LenDummyStrLenNoLocalBracketsB string %%a
CALL :TimeStamp StrLenNoLocalBracketsEnd

TITLE B - StrLenNoLocal
CALL :TimeStamp StrLenNoLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocal LenDummyStrLenNoLocalB string %%a
CALL :TimeStamp StrLenNoLocalEnd

TITLE Results
ECHO.

ECHO Time StrLenNoLocal          A :  !StrLenNoLocalTime!
ECHO Time StrLenNoLocalBrackets  A :  !StrLenNoLocalBracketsTime!
ECHO Time StrLenLocal            A :  !StrLenLocalTime!
ECHO Time StrLenLocalBrackets    A :  !StrLenLocalBracketsTime!
ECHO StrLen !LenDummyStrLenNoLocalA! / !LenDummyStrLenNoLocalBracketsA! / !LenDummyStrLenLocalA! / !LenDummyStrLenLocalBracketsA!
ECHO.

CALL :MeasureTime StrLenNoLocalTime StrLenNoLocalStart StrLenNoLocalEnd
CALL :MeasureTime StrLenNoLocalBracketsTime StrLenNoLocalBracketsStart StrLenNoLocalBracketsEnd
CALL :MeasureTime StrLenLocalTime StrLenLocalStart StrLenLocalEnd
CALL :MeasureTime StrLenLocalBracketsTime StrLenLocalBracketsStart StrLenLocalBracketsEnd

ECHO Time StrLenNoLocal          B :  !StrLenNoLocalTime!
ECHO Time StrLenNoLocalBrackets  B :  !StrLenNoLocalBracketsTime!
ECHO Time StrLenLocal            B :  !StrLenLocalTime!
ECHO Time StrLenLocalBrackets    B :  !StrLenLocalBracketsTime!
ECHO StrLen !LenDummyStrLenNoLocalB! / !LenDummyStrLenNoLocalBracketsB! / !LenDummyStrLenLocalB! / !LenDummyStrLenLocalBracketsB!
ECHO.


GOTO :EndOfBatch

REM https://stackoverflow.com/a/5841587/1378342
REM The original "function" is missing the /A for a number twice, which is wrong in my opinion. It seems to speed up the output.
REM I also added missing cosmetic double quotes for "set" to make it more accurate


:StrLenNoLocal
ECHO Loop %~3 / %Loops%
(SET^ tmp=!%~2!)
IF DEFINED tmp (
  SET /A "len=1"
  FOR %%P IN (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) DO (
     IF "!tmp:~%%P,1!" NEQ "" (
        SET /A "len+=%%P"
        SET "tmp=!tmp:~%%P!"
     )
  )
) ELSE (
  SET /A "len=0"
)
SET /A "%~1=!len!"
EXIT /B


:StrLenNoLocalBrackets
(
   ECHO Loop %~3 / %Loops%
   (SET^ tmp=!%~2!)
   IF DEFINED tmp (
      SET /A "len=1"
      FOR %%P IN (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) DO (
         IF "!tmp:~%%P,1!" NEQ "" (
            SET /A "len+=%%P"
            SET "tmp=!tmp:~%%P!"
         )
      )
   ) ELSE (
      SET /A "len=0"
   )
   SET /A "%~1=!len!"
   EXIT /B
)


:StrLenLocal
echo Loop %~3 / %Loops% & setlocal EnableDelayedExpansion & (set^ tmp=!%~2!)
if defined tmp (
  set /a "len=1"
  for %%P in (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) do (
     if "!tmp:~%%P,1!" NEQ "" (
        set /a "len+=%%P"
        set "tmp=!tmp:~%%P!"
     )
  )
) else (
    set /a "len=0"
)
endlocal & set /a "%~1=%len%" & exit /b


:StrLenLocalBrackets
(
   echo Loop %~3 / %Loops%
)
(
   setlocal EnableDelayedExpansion
   (set^ tmp=!%~2!)
   if defined tmp (
      set /a "len=1"
      for %%P in (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) do (
         if "!tmp:~%%P,1!" NEQ "" (
            set /a "len+=%%P"
            set "tmp=!tmp:~%%P!"
         )
      )
   ) else (
        set /a "len=0"
   )
)
(
   endlocal
   set /a "%~1=%len%"
   exit /b
)



:TimeStamp
SET /A %~1=1%time:~-5,-3%%time:~-2%
EXIT /B

:MeasureTime
SET /A %~1=!%~3!-!%~2!
IF !%~1! LSS 0 SET /A %~1=6000+!%~1!
SET %~1=!%~1:~0,-2!.!%~1:~-2!sec
EXIT /B



:EndOfBatch
PAUSE
ENDLOCAL
GOTO :EOF

输出：

Time StrLenNoLocal          A :  17.57sec
Time StrLenNoLocalBrackets  A :  15.06sec
Time StrLenLocal            A :  17.70sec
Time StrLenLocalBrackets    A :  18.09sec
StrLen 8191 / 8191 / 8191 / 8191

Time StrLenNoLocal          B :  17.05sec
Time StrLenNoLocalBrackets  B :  14.56sec
Time StrLenLocal            B :  17.39sec
Time StrLenLocalBrackets    B :  17.84sec
StrLen 8191 / 8191 / 8191 / 8191

看起来

( ... )
版本更快...

只要没有人反对，我的结论是：

我更喜欢行数较少的代码，只要不影响可读性即可。 但是 如果两个括号可能会使脚本运行得更快一点并且不会造成任何损害 - 为什么不呢？ ;)

windows batch-file syntax
1个回答
0
投票

经过一番“假设”之后……

  • 我的测量毫无意义
  • 我测量超时/ping
  • 我再次在括号内运行整个内容
  • 我将括号内的嵌套标签称为

思考：

@ECHO OFF

SETLOCAL EnableExtensions EnableDelayedExpansion

REM *** This string has the maximum length of 8191
set "str=."
FOR /L %%n in (1 1 13) DO SET "str=!str:~-4000!!str:~-4000!"
(set^ string=!str!!str:~-191!)

SET /A Loops=3000


TITLE A - StrLenNoLocal
CALL :TimeStamp StrLenNoLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocal LenDummyStrLenNoLocalA string %%a
CALL :TimeStamp StrLenNoLocalEnd

TITLE A - StrLenNoLocalBrackets
CALL :TimeStamp StrLenNoLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocalBrackets LenDummyStrLenNoLocalBracketsA string %%a
CALL :TimeStamp StrLenNoLocalBracketsEnd

TITLE A - StrLenLocal
CALL :TimeStamp StrLenLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocal LenDummyStrLenLocalA string %%a
CALL :TimeStamp StrLenLocalEnd

TITLE A - StrLenLocalBrackets
CALL :TimeStamp StrLenLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocalBrackets LenDummyStrLenLocalBracketsA string %%a
CALL :TimeStamp StrLenLocalBracketsEnd

CALL :MeasureTime StrLenNoLocalTime StrLenNoLocalStart StrLenNoLocalEnd
CALL :MeasureTime StrLenNoLocalBracketsTime StrLenNoLocalBracketsStart StrLenNoLocalBracketsEnd
CALL :MeasureTime StrLenLocalTime StrLenLocalStart StrLenLocalEnd
CALL :MeasureTime StrLenLocalBracketsTime StrLenLocalBracketsStart StrLenLocalBracketsEnd

REM Messure Timeout 5sec
TITLE Timeout 5sec
CALL :TimeStamp TimeoutStart
timeout /NOBREAK /T 5 >NUL
CALL :TimeStamp TimeoutEnd
CALL :MeasureTime TimeoutTime TimeoutStart TimeoutEnd

REM Ping...
TITLE Ping 5000
CALL :TimeStamp PingStart
ping 1.2.3.4 -n 1 -w 5000 >NUL
CALL :TimeStamp PingEnd
CALL :MeasureTime PingTime PingStart PingEnd

REM Ping 50 * 100
TITLE PingOneHundredTimes
CALL :TimeStamp PingOneHundredTimesStart
CALL :PingOneHundredTimes
CALL :TimeStamp PingOneHundredTimesEnd

TITLE PingOneHundredTimesBrackets
CALL :TimeStamp PingOneHundredTimesBracketsStart
CALL :PingOneHundredTimesBrackets
CALL :TimeStamp PingOneHundredTimesBracketsEnd

CALL :MeasureTime PingOneHundredTimesTime PingOneHundredTimesStart PingOneHundredTimesEnd
CALL :MeasureTime PingOneHundredTimesBracketsTime PingOneHundredTimesBracketsStart PingOneHundredTimesBracketsEnd

REM Invert order

TITLE B - StrLenLocalBrackets
CALL :TimeStamp StrLenLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocalBrackets LenDummyStrLenLocalBracketsB string %%a
CALL :TimeStamp StrLenLocalBracketsEnd

TITLE B - StrLenLocal
CALL :TimeStamp StrLenLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocal LenDummyStrLenLocalB string %%a
CALL :TimeStamp StrLenLocalEnd

TITLE B - StrLenNoLocalBrackets
CALL :TimeStamp StrLenNoLocalBracketsStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocalBrackets LenDummyStrLenNoLocalBracketsB string %%a
CALL :TimeStamp StrLenNoLocalBracketsEnd

TITLE B - StrLenNoLocal
CALL :TimeStamp StrLenNoLocalStart
FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocal LenDummyStrLenNoLocalB string %%a
CALL :TimeStamp StrLenNoLocalEnd

TITLE Results
ECHO.

REM "Empty" Timestamp Measure
CALL :TimeStamp TimestampStart
CALL :TimeStamp TimestampEnd
CALL :MeasureTime TimestampTime TimestampStart TimestampEnd

ECHO Time StrLenNoLocal          A :  !StrLenNoLocalTime!
ECHO Time StrLenNoLocalBrackets  A :  !StrLenNoLocalBracketsTime!
ECHO Time StrLenLocal            A :  !StrLenLocalTime!
ECHO Time StrLenLocalBrackets    A :  !StrLenLocalBracketsTime!
ECHO StrLen !LenDummyStrLenNoLocalA! / !LenDummyStrLenNoLocalBracketsA! / !LenDummyStrLenLocalA! / !LenDummyStrLenLocalBracketsA!
ECHO.

CALL :MeasureTime StrLenNoLocalTime StrLenNoLocalStart StrLenNoLocalEnd
CALL :MeasureTime StrLenNoLocalBracketsTime StrLenNoLocalBracketsStart StrLenNoLocalBracketsEnd
CALL :MeasureTime StrLenLocalTime StrLenLocalStart StrLenLocalEnd
CALL :MeasureTime StrLenLocalBracketsTime StrLenLocalBracketsStart StrLenLocalBracketsEnd

ECHO Time StrLenNoLocal          B :  !StrLenNoLocalTime!
ECHO Time StrLenNoLocalBrackets  B :  !StrLenNoLocalBracketsTime!
ECHO Time StrLenLocal            B :  !StrLenLocalTime!
ECHO Time StrLenLocalBrackets    B :  !StrLenLocalBracketsTime!
ECHO StrLen !LenDummyStrLenNoLocalB! / !LenDummyStrLenNoLocalBracketsB! / !LenDummyStrLenLocalB! / !LenDummyStrLenLocalBracketsB!
ECHO.
ECHO "Empty" Timestamp Measure   :  !TimestampTime!
ECHO Timeout /T 5                :  !TimeoutTime!
ECHO ping 1.2.3.4 -n 1 -w 5000   :  !PingTime!
ECHO PingOneHundredTimes         :  !PingOneHundredTimesTime!
ECHO PingOneHundredTimesBrackets :  !PingOneHundredTimesBracketsTime!
ECHO.


SET AREYOUSURE=n
SET /P "AREYOUSURE=Do you like to start over again inside brackets (y/[n]) ? "
IF /I "!AREYOUSURE!" EQU "y" CALL :DoItAgain


REM Test if labels inside brackets still works...

REM Label inside a Label with brackets
ECHO.
CALL :LabelBrackets
CALL :LabelInsideLabelBrackets
ECHO.
REM Label inside a Label with brackets without Exit after LabelBracketsWOExit
CALL :LabelBracketsWOExit
CALL :LabelInsideLabelBracketsWOExit
ECHO.



GOTO :EndOfBatch

REM https://stackoverflow.com/a/5841587/1378342
REM The original "function" is missing the /A for a number twice, which is wrong in my opinion. It seems to speed up the output.
REM I also added missing cosmetic double quotes for "set" to make it more accurate


:StrLenNoLocal
ECHO Loop %~3 / %Loops%
(SET^ tmp=!%~2!)
IF DEFINED tmp (
  SET /A "len=1"
  FOR %%P IN (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) DO (
     IF "!tmp:~%%P,1!" NEQ "" (
        SET /A "len+=%%P"
        SET "tmp=!tmp:~%%P!"
     )
  )
) ELSE (
  SET /A "len=0"
)
SET /A "%~1=!len!"
EXIT /B


:StrLenNoLocalBrackets
(
   ECHO Loop %~3 / %Loops%
   (SET^ tmp=!%~2!)
   IF DEFINED tmp (
      SET /A "len=1"
      FOR %%P IN (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) DO (
         IF "!tmp:~%%P,1!" NEQ "" (
            SET /A "len+=%%P"
            SET "tmp=!tmp:~%%P!"
         )
      )
   ) ELSE (
      SET /A "len=0"
   )
   SET /A "%~1=!len!"
   EXIT /B
)


:StrLenLocal
echo Loop %~3 / %Loops% & setlocal EnableDelayedExpansion & (set^ tmp=!%~2!)
if defined tmp (
  set /a "len=1"
  for %%P in (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) do (
     if "!tmp:~%%P,1!" NEQ "" (
        set /a "len+=%%P"
        set "tmp=!tmp:~%%P!"
     )
  )
) else (
    set /a "len=0"
)
endlocal & set /a "%~1=%len%" & exit /b


:StrLenLocalBrackets
(
   echo Loop %~3 / %Loops%
)
(
   setlocal EnableDelayedExpansion
   (set^ tmp=!%~2!)
   if defined tmp (
      set /a "len=1"
      for %%P in (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) do (
         if "!tmp:~%%P,1!" NEQ "" (
            set /a "len+=%%P"
            set "tmp=!tmp:~%%P!"
         )
      )
   ) else (
        set /a "len=0"
   )
)
(
   endlocal
   set /a "%~1=%len%"
   exit /b
)



:TimeStamp
SET /A %~1=1%time:~-5,-3%%time:~-2%
EXIT /B

:MeasureTime
SET /A %~1=!%~3!-!%~2!
IF !%~1! LSS 0 SET /A %~1=6000+!%~1!
IF "!%~1:~-2,-1!" == "" SET %~1=0!%~1!
IF "!%~1:~0,-2!" == "" SET %~1=0!%~1!
SET %~1=!%~1:~0,-2!.!%~1:~-2!sec
EXIT /B



:EndOfBatch
ENDLOCAL
GOTO :EOF



:LabelBrackets
(
   ECHO I'm called "%~0" .
   EXIT /B
   :LabelInsideLabelBrackets
   ECHO I'm called "%~0" .
   EXIT /B
)


:LabelBracketsWOExit
(
   ECHO I'm called "%~0" .
   :LabelInsideLabelBracketsWOExit
   ECHO I'm called "%~0" .
   EXIT /B
)



:PingOneHundredTimes
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
ping 1.2.3.4 -n 1 -w 50 >NUL
EXIT /B


:PingOneHundredTimesBrackets
(
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   ping 1.2.3.4 -n 1 -w 50 >NUL
   EXIT /B
)



:DoItAgain
(
    TITLE A - StrLenNoLocal
    CALL :TimeStamp StrLenNoLocalStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocal LenDummyStrLenNoLocalA string %%a
    CALL :TimeStamp StrLenNoLocalEnd

    TITLE A - StrLenNoLocalBrackets
    CALL :TimeStamp StrLenNoLocalBracketsStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocalBrackets LenDummyStrLenNoLocalBracketsA string %%a
    CALL :TimeStamp StrLenNoLocalBracketsEnd

    TITLE A - StrLenLocal
    CALL :TimeStamp StrLenLocalStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocal LenDummyStrLenLocalA string %%a
    CALL :TimeStamp StrLenLocalEnd

    TITLE A - StrLenLocalBrackets
    CALL :TimeStamp StrLenLocalBracketsStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocalBrackets LenDummyStrLenLocalBracketsA string %%a
    CALL :TimeStamp StrLenLocalBracketsEnd

    CALL :MeasureTime StrLenNoLocalTime StrLenNoLocalStart StrLenNoLocalEnd
    CALL :MeasureTime StrLenNoLocalBracketsTime StrLenNoLocalBracketsStart StrLenNoLocalBracketsEnd
    CALL :MeasureTime StrLenLocalTime StrLenLocalStart StrLenLocalEnd
    CALL :MeasureTime StrLenLocalBracketsTime StrLenLocalBracketsStart StrLenLocalBracketsEnd

    REM Messure Timeout 5sec
    TITLE Timeout 5sec
    CALL :TimeStamp TimeoutStart
    timeout /NOBREAK /T 5 >NUL
    CALL :TimeStamp TimeoutEnd
    CALL :MeasureTime TimeoutTime TimeoutStart TimeoutEnd

    REM Ping...
    TITLE Ping 5000
    CALL :TimeStamp PingStart
    ping 1.2.3.4 -n 1 -w 5000 >NUL
    CALL :TimeStamp PingEnd
    CALL :MeasureTime PingTime PingStart PingEnd

    REM Ping 50 * 100
    TITLE PingOneHundredTimes
    CALL :TimeStamp PingOneHundredTimesStart
    CALL :PingOneHundredTimes
    CALL :TimeStamp PingOneHundredTimesEnd

    TITLE PingOneHundredTimesBrackets
    CALL :TimeStamp PingOneHundredTimesBracketsStart
    CALL :PingOneHundredTimesBrackets
    CALL :TimeStamp PingOneHundredTimesBracketsEnd

    CALL :MeasureTime PingOneHundredTimesTime PingOneHundredTimesStart PingOneHundredTimesEnd
    CALL :MeasureTime PingOneHundredTimesBracketsTime PingOneHundredTimesBracketsStart PingOneHundredTimesBracketsEnd

    REM Invert order

    TITLE B - StrLenLocalBrackets
    CALL :TimeStamp StrLenLocalBracketsStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocalBrackets LenDummyStrLenLocalBracketsB string %%a
    CALL :TimeStamp StrLenLocalBracketsEnd

    TITLE B - StrLenLocal
    CALL :TimeStamp StrLenLocalStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenLocal LenDummyStrLenLocalB string %%a
    CALL :TimeStamp StrLenLocalEnd

    TITLE B - StrLenNoLocalBrackets
    CALL :TimeStamp StrLenNoLocalBracketsStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocalBrackets LenDummyStrLenNoLocalBracketsB string %%a
    CALL :TimeStamp StrLenNoLocalBracketsEnd

    TITLE B - StrLenNoLocal
    CALL :TimeStamp StrLenNoLocalStart
    FOR /L %%a IN (1,1,%Loops%) DO CALL :StrLenNoLocal LenDummyStrLenNoLocalB string %%a
    CALL :TimeStamp StrLenNoLocalEnd

    TITLE Results
    ECHO.

    REM "Empty" Timestamp Measure
    CALL :TimeStamp TimestampStart
    CALL :TimeStamp TimestampEnd
    CALL :MeasureTime TimestampTime TimestampStart TimestampEnd

    ECHO Time StrLenNoLocal          A :  !StrLenNoLocalTime!
    ECHO Time StrLenNoLocalBrackets  A :  !StrLenNoLocalBracketsTime!
    ECHO Time StrLenLocal            A :  !StrLenLocalTime!
    ECHO Time StrLenLocalBrackets    A :  !StrLenLocalBracketsTime!
    ECHO StrLen !LenDummyStrLenNoLocalA! / !LenDummyStrLenNoLocalBracketsA! / !LenDummyStrLenLocalA! / !LenDummyStrLenLocalBracketsA!
    ECHO.

    CALL :MeasureTime StrLenNoLocalTime StrLenNoLocalStart StrLenNoLocalEnd
    CALL :MeasureTime StrLenNoLocalBracketsTime StrLenNoLocalBracketsStart StrLenNoLocalBracketsEnd
    CALL :MeasureTime StrLenLocalTime StrLenLocalStart StrLenLocalEnd
    CALL :MeasureTime StrLenLocalBracketsTime StrLenLocalBracketsStart StrLenLocalBracketsEnd

    ECHO Time StrLenNoLocal          B :  !StrLenNoLocalTime!
    ECHO Time StrLenNoLocalBrackets  B :  !StrLenNoLocalBracketsTime!
    ECHO Time StrLenLocal            B :  !StrLenLocalTime!
    ECHO Time StrLenLocalBrackets    B :  !StrLenLocalBracketsTime!
    ECHO StrLen !LenDummyStrLenNoLocalB! / !LenDummyStrLenNoLocalBracketsB! / !LenDummyStrLenLocalB! / !LenDummyStrLenLocalBracketsB!
    ECHO.
    ECHO "Empty" Timestamp Measure   :  !TimestampTime!
    ECHO Timeout /T 5                :  !TimeoutTime!
    ECHO ping 1.2.3.4 -n 1 -w 5000   :  !PingTime!
    ECHO PingOneHundredTimes         :  !PingOneHundredTimesTime!
    ECHO PingOneHundredTimesBrackets :  !PingOneHundredTimesBracketsTime!
    ECHO.
    EXIT /B
)

输出：

Time StrLenNoLocal          A :  20.40sec
Time StrLenNoLocalBrackets  A :  16.82sec
Time StrLenLocal            A :  19.84sec
Time StrLenLocalBrackets    A :  19.17sec
StrLen 8191 / 8191 / 8191 / 8191

Time StrLenNoLocal          B :  17.40sec
Time StrLenNoLocalBrackets  B :  14.93sec
Time StrLenLocal            B :  17.64sec
Time StrLenLocalBrackets    B :  18.52sec
StrLen 8191 / 8191 / 8191 / 8191

"Empty" Timestamp Measure   :  0.00sec
Timeout /T 5                :  5.16sec
ping 1.2.3.4 -n 1 -w 5000   :  4.59sec
PingOneHundredTimes         :  50.50sec
PingOneHundredTimesBrackets :  50.50sec

...

Time StrLenNoLocal          A :  18.76sec
Time StrLenNoLocalBrackets  A :  16.76sec
Time StrLenLocal            A :  19.09sec
Time StrLenLocalBrackets    A :  19.67sec
StrLen 8191 / 8191 / 8191 / 8191

Time StrLenNoLocal          B :  18.24sec
Time StrLenNoLocalBrackets  B :  15.97sec
Time StrLenLocal            B :  18.63sec
Time StrLenLocalBrackets    B :  19.60sec
StrLen 8191 / 8191 / 8191 / 8191

"Empty" Timestamp Measure   :  0.00sec
Timeout /T 5                :  4.52sec
ping 1.2.3.4 -n 1 -w 5000   :  4.56sec
PingOneHundredTimes         :  50.49sec
PingOneHundredTimesBrackets :  50.49sec


I'm called ":LabelBrackets" .
I'm called ":LabelInsideLabelBrackets" .

I'm called ":LabelBracketsWOExit" .
I'm called ":LabelBracketsWOExit" .
I'm called ":LabelInsideLabelBracketsWOExit" .


我得出以下结论： 

ECHO %time%
timeout /T 5
ECHO %time%
  • 不正好是5秒。 ;)

  • 我每次都在“StrLenNoLocalBrackets”中遇到最低点。

  • 我还没有发现括号内的任何内容都会导致问题的命令链。 

:LongLabel
(
   ECHO I'm called "%~0" , because I have two extra lines.
   EXIT /B
)
  • LongLabel 是获胜者。 ;)
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