How to save log during uninstallation using NSIS - nsis

Question

I'm trying to log the uninstallation process, especially the files and folders deleted by rmdir for debug. However, LogSet On and DumpLog function seems not working. Does anyone knows if there is a way to do it?
Edit:
I'm using DumpLog like:
Section "Uninstall"
;ADD YOUR OWN FILES HERE...
LogSet On
DetailPrint "this is an uninstall test"
Delete "$INSTDIR\Uninstall.exe"
DeleteRegKey /ifempty HKCU "Software\Test"
DetailPrint "dumplog section"
StrCpy $0 "$INSTDIR\install.log"
Push $0
Call un.DumpLog
SectionEnd
Function un.DumpLog
Exch $5
Push $0
Push $1
Push $2
Push $3
Push $4
Push $6
FindWindow $0 "#32770" "" $HWNDPARENT
GetDlgItem $0 $0 1016
StrCmp $0 0 exit
FileOpen $5 $5 a
StrCmp $5 "" exit
SendMessage $0 ${LVM_GETITEMCOUNT} 0 0 $6
System::Alloc ${NSIS_MAX_STRLEN}
Pop $3
StrCpy $2 0
System::Call "*(i, i, i, i, i, i, i, i, i) i \
(0, 0, 0, 0, 0, r3, ${NSIS_MAX_STRLEN}) .r1"
loop: StrCmp $2 $6 done
System::Call "User32::SendMessageA(i, i, i, i) i \
($0, ${LVM_GETITEMTEXT}, $2, r1)"
System::Call "*$3(&t${NSIS_MAX_STRLEN} .r4)"
FileWrite $5 "$4$\r$\n"
IntOp $2 $2 + 1
Goto loop
done:
FileClose $5
System::Free $1
System::Free $3
exit:
Pop $6
Pop $4
Pop $3
Pop $2
Pop $1
Pop $0
Exch $5
FunctionEnd
More Edit:
Things are getting more complex.
I put the structure like:
-InstDir
-UnInstDir
-Uninstaller.exe
When I run uninstaller or use execwait $InstDir\UnInstDir\Uninstall.exe, LogSet On works and a new install.log was created in UnInstDir.
However, when I use execwait $InstDir\UnInstDir\Uninstall.exe _?=$InstDir, LogSet On doesn't work.
Anyone has any clue on it?

Answer 1

LogSet requires that you use the logging build of NSIS. DumpLog only writes the same info as you see on the InstFiles page.
Another alternative is to track the files as you install them.
The final option is to use !system to execute a script (batch file etc.) that generates two .nsh files (one for the installer, one for the uninstaller) with File and Delete instructions based on the output of dir /s.