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.

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 "".

And after that use

StrCmp $R0 1 KeyFound KeyNotFound

KeyFound:

  File bla.exe

  etc...

KeyNotFound:

And put that all in a Section

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