[CMake] Windows Registry keys and values

[Pau Garcia i Quiles]

Quoting Bill Hoffman <bill.hoffman at kitware.com>:

> Pau Garcia i Quiles wrote:
>> Hello,
>>
>> Does CMake provide any command to check for the existence of keys   
>> in the Windows registry, or to find out its values? I have been   
>> searching but nothing came along. Is running "reg query   
>> REGISTRY_PATH /v KEY" the only way?
>
> Some commands do.  For example, the FIND_* stuff can use the registry
> for paths like this:
>
>  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.4;Root]/lib
>
> If you grep for HKEY in the Modules directory you can see many examples.

I knew but I am interested in the case you say below. I should have  
been more specific in my question.

> In addition the GET_FILENAME_COMPONENT calls on the FileName.
> So, you might be able to do this:
>
> GET_FILENAME_COMPONENT(foo
> [HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.4;Root])
>
> And foo would have the registry value.
>
> -Bill

That doesn't work for me. With this CMakeLists.txt file:

============
GET_FILENAME_COMPONENT( THE_PATH   
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Boost-Consulting.com\\1.34.0;InstallRoot]  
)

MESSAGE( "THE_PATH = ${THE_PATH}" )
============

I receive this error:

============
C:\temp3\a>cmake ..
-- Check for working C compiler: cl
-- Check for working C compiler: cl -- works
-- Check size of void*
-- Check size of void* - done
-- Check for working CXX compiler: cl
-- Check for working CXX compiler: cl -- works
CMake Error: Error in cmake code at
C:/temp3/CMakeLists.txt:1:
GET_FILENAME_COMPONENT called with incorrect number of arguments
Current CMake stack: C:/temp3/CMakeLists.txt;C:/Archivos de  
programa/CMake  
2.4/share/cmake-2.4/Modules/CMakeCInformation.cmake;C:/Archivos de  
programa/CMake  
2.4/share/cmake-2.4/Modules/Platform/Windows-cl.cmake;C:/temp3/a/CMakeFiles/CMakeCP
latform.cmake
THE_PATH =
-- Configuring done
============

I am using CMake 2.4.6.

Thank you.