[CMake] How to read a registry key?

[Anton Deguet]

Bill,

I had some success with the key expansion but I haven't been able to do
what I need.  Basically, I would like to get the un-expanded content of
the user path, i.e. not the expanded path (user and system) which can be
found using $ENV{PATH}.

I tried the following code, i.e. adding two variables, one using the
other:

SET(CISST_PATH ${EXECUTABLE_OUTPUT_PATH} ${LIBRARY_OUTPUT_PATH})
SET(CISST_PATH_REG_KEY "HKEY_CURRENT_USER\\Environment;CISST_PATH")
EXEC_PROGRAM(${CMAKE_COMMAND}
             ARGS "-E write_regv \"${CISST_PATH_REG_KEY}\"
\"${CISST_PATH}\"")

SET(OTHER_PATH_REG_KEY "HKEY_CURRENT_USER\\Environment;OTHER_PATH")
SET(OTHER_PATH "c:/prg;%CISST_PATH%")
EXEC_PROGRAM(${CMAKE_COMMAND}
                 ARGS "-E write_regv \"${OTHER_PATH_REG_KEY}\"
\"${OTHER_PATH}\"")

GET_FILENAME_COMPONENT(TMP "[HKEY_CURRENT_USER\
\Environment;OTHER_PATH]/dummy.dum" PATH)

MESSAGE("${TMP}")

At that point, everything looks great and I can check the results with
"reg.exe", the expansion works ...

Now, if I try to retrieve the user path using
GET_FILENAME_COMPONENT(TMP "[HKEY_CURRENT_USER\
\Environment;PATH]/dummy.dum" PATH)

TMP is set to "/registry" ...  Any explanation or better solution to
just retrieve the value as a string?


On Wed, 2006-09-06 at 20:55 -0400, William A. Hoffman wrote:
> At 05:36 PM 9/6/2006, Anton Deguet wrote:
> >Hello,
> >
> >I have found that using EXEC_PROGRAM with ${CMAKE_COMMAND} -E I can
> >write/remove a key in the Windows registry but I haven't figured out how
> >to read a key.  Is there a simple solution for that?  
> 
> Sure, but it seems not to be documented....
> Several commands including GET_FILENAME_COMPONENT will expand things
> like this:
> 
> "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\2.0;JavaHome]/bin"
> 
> You can use this to read registry values.  I will add some docs in
> the morning.
> 
> -Bill
> 
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-- 
Anton Deguet <anton.deguet at jhu.edu>
ERC CISST Johns Hopkins University