@echo off
setlocal enabledelayedexpansion
set /p n=输入数字：
(for /f "delims=" %%a in (a.txt) do (
  if "%%a"=="END_!n!" set f=1
  if defined f exit /b
  if defined f1 echo.%%a
  if "%%a"=="START_!n!：" set f1=1  
))>result.txt
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@echo off
setlocal enabledelayedexpansion
for /f "tokens=2 delims=:" %%a in (result.txt) do (
  for %%b in (%%a) do (
    set str=%%b
    set str=0x!str!
    set /p =!str!,<nul
  )
  echo.
)
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@echo off&setlocal enabledelayedexpansion
for /f "tokens=2 delims=:" %%l in (a.txt) do (
	for %%i in (%%l) do (
		set /a n+=1
		set line=!line!,0x%%i
	)
	echo;length=!n!!line!
	set n=&set line=
)
pause & exit /b
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