Visual LISP, AutoLISP and General Customization

Visual LISP, AutoLISP and General Customization

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Mentor
The_Caddie
Posts: 208
Registered: ‎06-08-2010
Message 1 of 3 (294 Views)

If else when checking for registry key

294 Views, 2 Replies
10-12-2012 01:06 AM

I want to create a registry key using lisp but only if it dost already exist I know how to use the IF else function and how to create a registry key using lisp but not sure on how to check for the existence of a registry key with in a lisp program?

*Expert Elite*
pbejse
Posts: 2,500
Registered: ‎11-24-2009
Message 2 of 3 (291 Views)

Re: If else when checking for registry key

10-12-2012 01:19 AM in reply to: The_Caddie

vl-registry-read 

vl-registry-write

vl-registry-delete

 

or

GETENV and SETENV me thinks

 

HTH

 

Contributor
bobdobbs
Posts: 15
Registered: ‎09-27-2012
Message 3 of 3 (269 Views)

Re: If else when checking for registry key

10-12-2012 01:43 PM in reply to: The_Caddie

I think vl-registry-write will only make the key if it doesn't exist. Or, rather I should say, you will not lose any values already in that key by using vl-registry-write to try to create it.

 

So, why check first? (Unless you mean a registry "VALUE" or "DATA" and not "KEY")

 

Example:

 

Command: (vl-registry-read "HKEY_CURRENT_USER\\TestA")
nil

Key does not exist


Command: (vl-registry-write "HKEY_CURRENT_USER\\TestA")
T

Now it does but has no values

Command: (vl-registry-read "HKEY_CURRENT_USER\\TestA")
nil

read fails because it looks for a value

Command: (vl-registry-write "HKEY_CURRENT_USER\\TestA" "" "default-value")
"default-value"
I add a value


Command: (vl-registry-read "HKEY_CURRENT_USER\\TestA")
"default-value"

It reads a value


Command: (vl-registry-write "HKEY_CURRENT_USER\\TestA")
T

I re-write the key

Command: (vl-registry-read "HKEY_CURRENT_USER\\TestA")
"default-value"

value is still there

 

 

fugetaboutit

 

 

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