CALL batch file environment variables discarded in Windows 7 - windows

Question

I have been successfully using the CALL mechanism to allow one batch file to CALL another to setup environment variables. This code has been working well for over a year on Windows XP.
However, it does not appear to be working in the same way on Windows 7. The variables exist in the second batch file just before the EXIT /B statement. But, they do not exist upon the return to the first batch file.
Some trivial examples seem to work as expected, but the large batch scripts do not.
Has anyone had difficulties with this or know any workarounds?

Answer 1

In years of advanced batch scripting, I have never seen a CALL fail to preserve environment variables unless the called script (or label) set the variable when SETLOCAL was still active. There is an implicit ENDLOCAL for every active SETLOCAL from the within the CALL upon termination of the CALL.
It sounds like you have put in diagnostic messages prior to your EXIT /B to confirm that your variables are defined. I would take it one step further and add multiple ENDLOCAL statements prior to your diagnostic messages. I suspect you will then see your values dissapear prior to EXIT /B. You can add as many ENDLOCAL as you want. ENDLOCAL will never affect SETLOCAL that occurred prior to the CALL.
The most likely explanation is that either your script has somehow changed from XP to Win 7, or else there is some context change in your Win 7 environment that is exercising some aspect of the code that hadn't been exposed before.

Answer 2

Try this:
(
ENDLOCAL
SET "_Var1=Some Variable You want to exist"
SET "_Var2=Some Other Variable You want to exist"
EXIT /b 0
)
Also make sure you call Batch 2 from batch 1 like this:
CALL "\\PathToBatch2\Batch2.cmd"
ALTERNATELY you can do this:
CMD One:
REM Script: Batch1
#(
SETLOCAL
ECHO OFF
SET "_CallBatch2=C:\PathToBatch2\Batch2.cmd"
SET "_SetCmd=CALL :SetCMD "
SET "_RecievedVarList="
SET "_RecievedVar1=" & REM -- Note only done to show this is being created, normally you won't know or care what variables are being returned.
SET "_eLvL=0"
)
CALL :Main
(
ENDLOCAL
EXIT /b %_eLvl%
)
:Main
FOR %%A IN (CALL "%_CallBatch2%") DO (
IF /I "%%~A" EQU "SET" (
REM CALL %%A "%%~B" would work too
%_SetCmd% %%~B
) ELSE (
REM Looks like this was intended to be some output, show it.
ECHO.%%A %%B
)
)
FOR /F "Tokens=1*" %%A IN (%_RecievedVarList%) DO (
REM ECHO the Variable's name and it's contents:
CALL ECHO."%%~A" = "%%%%~A%%"
)
GOTO :EOF
:SetCMD
SET "%*"
FOR /F "Tokens=1 Delims==" %A IN ("%*") DO (
REM Store vars to output later to check their values.
SET "_RecievedVarList=%_RecievedVarList% "%A""
)
GOTO :EOF
.
CMD Two:
REM Script: Batch2
#(
SETLOCAL
ECHO OFF
)
CALL :Main
(
ENDLOCAL
EXIT /b %_eLvl%
)
:Main
ECHO.SET "_RecievedVar1=This is Recieved Var 1"
ECHO.SET "_RecievedVar2=This is Recieved Var 2"
GOTO :EOF