Can't understand how stack works
 

I've written following function:

code:
Function KillMyProcess

	; Change current directory to temp

	; to prevent creation of TempWmicBatchFile.bat

	Push $OUTDIR

	StrCpy $OUTDIR $TEMP

	nsexec::ExecToLog "wmic process where name='MyApp.exe' delete"

	Pop $OUTDIR

FunctionEnd

As far as I know $OUTDIR should not change after this function is called, but it equals to 0 instead. I tried to add debug message boxes. Looks like everything goes fine until Pop is called which just sets $OUTDIR value to zero. Why is that?

And also I've discovered that changing $OUTDIR on a page before instfiles does not help. Looks like it do not change current directory before instfiles.

From the documentation for the nsExec plugin:So your code is putting the return value from nsExec into $OUTDIR and leaving the original value still on the stack. You need to use another Pop command to retrieve the $OUTDIR value you saved on the stack.

There is a wiki page that has some information about how the stack works:
http://nsis.sourceforge.net/Pop,_Pus...h..._The_Stack

Thank you