Batch file not recognizing the environment variable

Archive: Batch file not recognizing the environment variable

sandeepsirsgi
16th December 2006 05:40 UTC

Batch file not recognizing the environment variable
Hi,

I am able to set the environment variable by using following following NSIS script.

Push JAVA_HOME
Push "d:\JDK1.5"
Call WriteEnvStr

After that i am running a batchfile using NSIS which is refering the JAVA_HOME to execute the batch.
But the .bat file is not recognizing the environment variable JAVA_HOME.
If i run that .bat file through command prompt then it's working.

Can any one help me on that.

Regards
sandy

kichik
16th December 2006 10:25 UTC

Setting environment variables this way doesn't affect running processes. Use SetEnvironmentVariable for that.

sandeepsirsgi
18th December 2006 06:00 UTC

I am running a batch file which is refering to JAVA_HOME and
taking APP_HOME as classpath. I am able to set environment variable by using following NSIS script.

Push JAVA_HOME
Push "d:\JDK1.5"
Call WriteEnvStr
Push APP_HOME
Push "d:\application"
Call WriteEnvStr

ReadEnvStr $R0 "PATH"
StrCpy $R0 "$R0;$TEMP2;$TEMP1"
SetEnv::SetEnvVar "PATH" "$R0"
Exec batchfile.bat

Here $TEMP1 and $TEMP2 contains path to java_home
and batch file respectively. When batch file is executed
it's not able to recognize

Still not able to execute batch file.

Red Wine
18th December 2006 12:10 UTC

Case 1.
If you want to set an environment variable only for the installer process and its sub-processes use:

!define JAVA_HOME "d:\JDK1.5"
!define APP_HOME "d:\application"

Section "Add Env Var"
ReadEnvStr $R0 "PATH"
messagebox mb_ok '$R0'
StrCpy $R0 "$R0;${JAVA_HOME};${APP_HOME}"
System::Call 'Kernel32::SetEnvironmentVariableA(t, t) i("PATH", R0).r2'
ReadEnvStr $R0 "PATH"
messagebox mb_ok '$R0'
exec 'batchfile.bat'
SectionEnd

Case 2.
If you want to set an environment variable that will stick for every other process and after reboots too...

!define JAVA_HOME "d:\JDK1.5"
!define APP_HOME "d:\application"

!include WriteEnvStr.nsh

Section "Add Env Var"
  !ifdef ALL_USERS
    !define ReadEnvStr_RegKey \
       'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'
  !else
    !define ReadEnvStr_RegKey 'HKCU "Environment"'
  !endif

  Push JAVA_HOME
  Push '${JAVA_HOME}'
  Call WriteEnvStr
  Push APP_HOME
  Push '${APP_HOME}'
  Call WriteEnvStr

ReadEnvStr $R0 "PATH"
messagebox mb_ok '$R0'
;ensure that is written valid for NT only
ReadRegStr $0 ${ReadEnvStr_RegKey} 'JAVA_HOME'
ReadRegStr $1 ${ReadEnvStr_RegKey} 'APP_HOME'
StrCpy $R0 "$R0;$0;$1"
;or just this
;StrCpy $R0 "$R0;${JAVA_HOME};${APP_HOME}"
System::Call 'Kernel32::SetEnvironmentVariableA(t, t) i("PATH", R0).r2'
ReadEnvStr $R0 "PATH"
messagebox mb_ok '$R0'
writeuninstaller '$EXEDIR\uninst.exe'
exec 'batchfile.bat'
SectionEnd
# ...
Section uninstall
  # remove the variable
  Push JAVA_HOME
  Call un.DeleteEnvStr
  Push APP_HOME
  Call un.DeleteEnvStr
SectionEnd

sandeepsirsgi
8th January 2007 04:38 UTC

Sorry for late reply.
It worked for me.

Regards
Sandeep