Batch File: Convert bytes to either KB, MB or GB with 2 decimal points

Hi there,

I need to create a batch file that will convert a number in bytes to either KB, MB or GB with 2 decimal points.

@echo off

FOR %%A IN (4321,1342.56,2145386496) do (
   call :ConvertNumber
   ECHO "%%A" is easyer to read like this: %ConvertedNumber%
)
ECHO.
PAUSE
EXIT

:ConvertNumber
whatever script
exit /b

RESULT:
4.21 KB
1.99 GB


Hoping this will be easy points for you.

Cheers,
Rene
LVL 10
ReneGeAsked:
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Bill PrewCommented:
==> 1342.56

This is actually quite a bit harder than you might think in a BAT file.  Could something be worked up, yes (and as a Math major I like to play with things like this).  But math support in BAT is relatively weak, and only integer numbers are supported so any manipulation of decimals has to be performed manually in the BAT script.  In addition, numbers are limited to 2^31 in size, so they max out at 2147483647, and so as a result any number larger than 2GB can not be dealt with.

Some approximations can be done and that is what I have typically seen on EE, there are some questions that already have solutions to this, a little searching will likely turn these up.

I often use a couple of standalone EXE utilities that do math for any complex algebra in a BAT script.

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/MS_DOS/Q_24881845.html

~bp
0

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ReneGeAuthor Commented:
Thanks billprew,

Cool, this is very educational.

Thanks,
Rene
0
Bill PrewCommented:
Here are a couple of the tools I use from time to time.  Best to rename CALC to something else, since calc.exe is now the Windows GUI calculator.

~bp
utils.zip
0
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ReneGeAuthor Commented:
Thanks pal!

Rene
0
ReneGeAuthor Commented:
0
ReneGeAuthor Commented:
Just sharing a related simple script I just did.

Cheers,
Rene
@echo off
setlocal enabledelayedexpansion

for %%A IN (1,1024,1048576,1073741824) do (
	SET FileSize=%%A
	CALL :ConvertFileSize
	echo %%A Bytes=!FileSize!
	)
PAUSE
exit

:ConvertFileSize
IF !FileSize! GEQ 1073741824 (SET /a FileSize=!FileSize! / 1073741824 && SET FileSize=!FileSize! GB && Exit/b)
IF !FileSize! GEQ 1048576 (SET /a FileSize=!FileSize! / 1048576 && SET FileSize=!FileSize! MB && Exit/b)
IF !FileSize! GEQ 1024 (SET /a FileSize=!FileSize! / 1024 && SET FileSize=!FileSize! KB && Exit/b)
IF !FileSize! LSS 1024 SET FileSize=!FileSize! Bytes
exit /b

Open in new window

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Bill PrewCommented:
Just to show how the mathematician in me might approach it...

~bp
@echo off
setlocal enabledelayedexpansion
 
for %%A IN (1,1024,1048576,1073741824) do (
        SET FileSize=%%A
        CALL :ConvertFileSize
        echo %%A Bytes=!FileSize!
        )
PAUSE
 
for %%A IN (1,1024,1048576,1073741824) do (
        CALL :ScaleNumber %%A "FileSize"
        echo %%A Bytes=!FileSize!
        )
PAUSE
exit /b
 
:ConvertFileSize
IF !FileSize! GEQ 1073741824 (SET /a FileSize=!FileSize! / 1073741824 && SET FileSize=!FileSize! GB && Exit/b)
IF !FileSize! GEQ 1048576 (SET /a FileSize=!FileSize! / 1048576 && SET FileSize=!FileSize! MB && Exit/b)
IF !FileSize! GEQ 1024 (SET /a FileSize=!FileSize! / 1024 && SET FileSize=!FileSize! KB && Exit/b)
IF !FileSize! LSS 1024 SET FileSize=!FileSize! Bytes
exit /b
 
:ScaleNumber [input-number] [output-variable-name]
  set Number=%~1
  set Scale=1
  for /L %%A in (1,1,3) do (
    if !Number! GEQ 1024 (
      set /A "Number = Number >> 10"
      set /A Scale += 1
    )
  )
  for /F "tokens=%Scale% delims=," %%A in ("Bytes,KB,MB,GB") do set %~2=%Number% %%A
  exit /b

Open in new window

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ReneGeAuthor Commented:
bp,

Your just too cool!!

Cheers,
Rene
0
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