Check existence of registry key

Archive: Check existence of registry key

Breepee
26th February 2004 20:11 UTC

Check existence of registry key
I want to build a package that, depending on the existence of a certain registry key, copies some files to a directory (also found in the registry) or just quits. This all very silent. Getting the InstallDIr from the registry is no problem, but I don't understand the codesnippit from the NSIS-archieve http://nsis.sourceforge.net/archive/...hp?pageid=307.

Can someone create a complete basic example of a ready2compile script. I think I can manage from there.

Joost Verburg
26th February 2004 20:58 UTC

Do you really need to know whether it exits or is knowing whether it has a value enough?

In the first case, use the macro from that archive page:

!insertmacro IfKeyExists "ROOT" "KeyToCheckIn" "KeyToCheck"
Pop $R0
;$R0 contains 0 (not present) or 1 (present)

Otherwise, just compare the value form the key with "".

Devion
26th February 2004 21:56 UTC

And after that use

StrCmp $R0 1 KeyFound KeyNotFound
KeyFound:
  File bla.exe
  etc...
KeyNotFound:

And put that all in a Section

Comm@nder21
27th February 2004 14:09 UTC

easier:

Push $0
ClearErrors

ReadRegStr $0 ROOT "Your\Reg\Path" "YourKey"
IfErrors KeyDoesntExist KeyExists

KeyDoestnExist:
ClearErrors
# do something
Goto End

KeyExists:
# do something else

End:
Pop $0