The function user-preference reads the value of the registry entry value-name under path under the registry path defined for product by (setf product-registry-path). If the registry entry was found a second value t is returned. If the registry entry was not found, then value is nil.
The function (setf user-preference) sets the value of that registry entry to value.
If path is a list of strings, then it is interpreted like the directory component of a pathname. If path is a string, then any directory separators should be appropriate for the platform - that is, use backslash on Windows, and forward slash on non-Windows systems.
ExampleThis example is on Microsoft Windows. Note the use of backslashes as directory separators in the path argument:
(setf (user-preference "My Stuff\\FAQ"
"Ultimate Answer"
:product :deep-thought)
42)
=>
42
This is equivalent to the previous example, and is portable because we avoid the explicit directory separators in the path argument:
(setf (user-preference (list "My Stuff" "FAQ")
"Ultimate Answer"
:product :deep-thought)
42)
=>
42
We can retrieve values on Windows like this:
(user-preference "My Stuff\\FAQ"
"Ultimate Answer"
:product :deep-thought)
=>
42
t
We can retrieve values on any platform like this:
(user-preference (list "My Stuff" "FAQ")
"Ultimate Question"
:product :deep-thought)
=>
nil
nil
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