Re: batch file with arithmatic operations on ip addresses

Mon, 22 Nov 2010 11:16:06 -0700

Posted a 'reply on the MS-DOS forum.

My two cents

I'm thinking this process will need to be broken down into chunks in order to do what needs to be done.

So first we'll need the gateway

:: Get the Gateway
for /F "usebackq tokens=13" %%i in (`ipconfig ^| find /i "gateway"`) do set gateway=%%i

You can use a similar technique for getting the IP address
for /F "usebackq tokens=14" %%i in (`ipconfig ^| find /i "IPv4"`) do echo %%i

(Note: I was trying to make use of the 'delims' option but I wound up with extra spaces I didn't want to have to deal with trimming. For example, the following would return " 192.168.1.2" instead of "192.168.1.2"

for /F "usebackq tokens=2 delims=:" %i in (`ipconfig ^| find /i "IPv4"`) do echo %i

or

for /F "usebackq tokens=13 delims=: " %i in (`ipconfig ^| find /i "IPv4"`) do echo %i

Any ideas on overcoming this?)

Next I'm thinking you'll probably need to split the IP at some point; I recommend using a subroutine of sorts.

CALL :SPLITIP %gateway%

:SPLITIP
:: Split IP into Separate Octects
set IP=%1
if defined IP (
for /F "usebackq delims=. tokens=1-4" %%i in (`echo %IP%`) do (
set GIPO1=%%i
set GIPO2=%%j
set GIPO3=%%k
set GIPO4=%%l
)
) else ( echo ERROR: Gateway Not Defined (%gateway%) & ping -n 30 localhost >nul & goto END )
rem for %%i in (%GIPO1% %GIPO2% %GIPO3% %GIPO4%) do echo %%i
GOTO :EOF

At at some point you may need to know the length of a variable or two in order to do some advanced string manipulation. I use yet another subroutine for that.
@echo off
cls

set mystring=five

CALL :GETLENGTH %mystring%

:GETLENGTH
:: Send the length of the variable %1 to the variable %var_length%
:: Thanks to Leonardo Pignataro secret_doom@hotmail.com www.batch.hpg.com.br
set length_target=%1
set var_length=0
:GLoop
if defined length_target (
set length_target=%length_target:~1%
set /A var_length += 1
goto GLoop
)
echo Var is %var_length% characters long!
GOTO :EOF

This should return "Var is 5 characters long!"

Haven't throughly tested any of this code, but it should be good.

Phylum's Feed - Programmer's Heaven

Re: batch file with arithmatic operations on ip addresses