NSIS Help - what's the meaning of this?

Comperio · 16th July 2005, 22:27

I was browsing the NSIS help files looking for information about installer (and uninstaller) error levels.

I found this example of how to get the error level of an uninstaller by simulating the TEMP file copy like so:

code:


CopyFiles $INSTDIR\uninstaller.exe $TEMP

ExecWait '"$TEMP\uninstaller.exe" _?=$INSTDIR' $0

DetailPrint "uninstaller set error level $0"

What I don't understand is the purpose for the "_?=$INSTDIR" in the command line (shown in red above). I've searched the manual and the forums but haven't found anything on this. Can someone please elaborate?

16th July 2005, 22:27	#1
Comperio Major Dude Join Date: Jan 2005 Location: Oregon Coast Posts: 737	NSIS Help - what's the meaning of this? I was browsing the NSIS help files looking for information about installer (and uninstaller) error levels. I found this example of how to get the error level of an uninstaller by simulating the TEMP file copy like so: code: CopyFiles $INSTDIR\uninstaller.exe $TEMP ExecWait '"$TEMP\uninstaller.exe" _?=$INSTDIR' $0 DetailPrint "uninstaller set error level $0" What I don't understand is the purpose for the "_?=$INSTDIR" in the command line (shown in red above). I've searched the manual and the forums but haven't found anything on this. Can someone please elaborate?

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