Re: How to set environment variable via JScript?

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Thanks, Walter. I tried your batch and script; found that the cscript logo
output was messing it up, so I changed your line

for /f "tokens=*" %%a in ('cscript setvar.js') do %%a

to

for /f "tokens=*" %%a in ('cscript //nologo setvar.js') do %%a

and it worked perfectly.

After some study of the lengthy FOR documentation I was able to figure out
how that line works; the DOS batch language, I now realize, is more powerful
than I'd thought, but rather cryptic. I think I'll have an easier time with
all-scripting solutions.

Best wishes,

David


"Walter Zackery" <please_respond_to@xxxxxxxxx> wrote in message
news:e%23VybgH4GHA.1300@xxxxxxxxxxxxxxxxxxxxxxx
Use StdOut to send values back to the batch file and change environmental
variables. For example:

::caller.bat
@echo off
SET MYVAR=Original value of MYVAR
echo Value of MYVAR is: %MYVAR%
echo Running script ...
for /f "tokens=*" %%a in ('cscript setvar.js') do %%a
echo Value of MYVAR is: %MYVAR%
pause

//setvar.js
WScript.StdOut.WriteLine("Set MYVAR=New value of MYVAR")

"David Mayerovitch" <davmay@xxxxxxxxxxxx> wrote in message
news:OkxEbFt3GHA.1288@xxxxxxxxxxxxxxxxxxxxxxx
I am running Windows XP Home with SP2.

From a batch file ("caller.bat") I would like call a JScript file
("setvar.js") to set the value of a DOS environment variable (MYVAR)
which the batch file could then manipulate. (I need to do some tweaking
of strings that the DOS batch language is incapable of doing.)

But I find with the following test files that the script fails to change
MYVAR from its original value. This failure occurs whether I use "USER",
"SYSTEM", "VOLATILE" or "PROCESS" as the parameter to the Environment
property of the WScript.Shell object.

Can anyone tell me why this setup is not working and how I can fix it?

Thanks.
David

-------------------------------------
Text of batch file "caller.bat":
-------------------------------------
@echo off
SET MYVAR=Original value of MYVAR
echo Value of MYVAR is: %MYVAR%
echo Running script ...
cscript setvar.js
echo Value of MYVAR is: %MYVAR%
pause

-------------------------------------
Text of script file "setvar.js":
-------------------------------------
function setEnvVariable(mystring){
WScript.Echo("This is setvar.js");
var sh=WScript.CreateObject("WScript.Shell");
var userEnv=sh.Environment("USER");
userEnv("MYVAR")=mystring;
return;
}

setEnvVariable("New value of MYVAR");
-------------------------------------








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