Windows Batch File Expansion Variables - windows

Question

I'm having an issue with a Batch File. Basically, I would like to seek ahead by 1 in a for loop and use that value to reference the parameter at that position and then assign it to a variable which I can then use later, see code sample below.
Example: set myVar=%1+1
Where %1 is param name, and %2 would be param value.
::Batch file sample
#echo off
SETLOCAL ENABLEDELAYEDEXPANSION
set count=0
set HasParam=0
set ParamValue="null"
set paramValPos=0
for %%i in (%*) do (
set /a count=!count!+1
if /i "%%i"=="MyParam" (
set /a HasParam=1
set /a paramValPos=!count!+1
::The next line is where I Need Help, it's currently incorrect!
set ParamValue=%!paramValPos!
)
)
if %HasParam%==1 (
echo "Parameter Value: %ParamValue%"
)
pause
Example call from command line: prog.bat MyParam=5
Now I know that I can access it at pos 2, like:
::Sample batch file
#echo off
echo "Param Name: %1"
echo "Param Value: %2"
pause
However, this is not what I want, as there are more parameters and some are optional and they can also be passed in, in any order.
Thanks for your assistance.

Answer 1

call set "ParamValue=%%!paramValPos!"

Answer 2

If I understood your request correctly, you want the next parameter after a given one. The Batch code below do that:
#echo off
set "HasParam="
set "ParamValue="
for %%i in (%*) do (
if defined HasParam (
if not defined ParamValue (
set ParamValue=%%i
)
) else if /i "%%i"=="MyParam" (
set HasParam=yes
)
)
if defined HasParam (
echo "Parameter Value: %ParamValue%"
)
pause