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Help: cmake-developer: Add section for Windows registry access.

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Fixes: #23905
This commit is contained in:
Marc Chevrier
2022-09-04 16:06:01 +02:00
parent 0e7bb4e783
commit 5b30ca2436
1 changed files with 79 additions and 64 deletions
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143
Help/manual/cmake-developer.7.rst
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@@ -18,6 +18,85 @@ See https://cmake.org/get-involved/ to get involved in development of
CMake upstream. It includes links to contribution instructions, which
in turn link to developer guides for CMake itself.
Accessing Windows Registry
==========================
CMake offers some facilities to access the registry on ``Windows`` platforms.
Query Windows Registry
----------------------
.. versionadded:: 3.24
The :command:`cmake_host_system_information` command offers the possibility to
query the registry on the local computer. See
:ref:`cmake_host_system(QUERY_WINDOWS_REGISTRY) <Query Windows registry>` for
more information.
.. _`Find Using Windows Registry`:
Find Using Windows Registry
---------------------------
.. versionchanged:: 3.24
Options ``HINTS`` and ``PATHS`` of :command:`find_file`,
:command:`find_library`, :command:`find_path`, :command:`find_program`, and
:command:`find_package` commands offer the possibility, on ``Windows``
platform, to query the registry.
The formal syntax, as specified using
`BNF <https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form>`_ notation with
the regular extensions, for registry query is the following:
.. raw:: latex
\begin{small}
.. productionlist::
registry_query: '[' `sep_definition`? `root_key`
: ((`key_separator` `sub_key`)? (`value_separator` `value_name`_)?)? ']'
sep_definition: '{' `value_separator` '}'
root_key: 'HKLM' | 'HKEY_LOCAL_MACHINE' | 'HKCU' | 'HKEY_CURRENT_USER' |
: 'HKCR' | 'HKEY_CLASSES_ROOT' | 'HKCC' | 'HKEY_CURRENT_CONFIG' |
: 'HKU' | 'HKEY_USERS'
sub_key: `element` (`key_separator` `element`)*
key_separator: '/' | '\\'
value_separator: `element` | ';'
value_name: `element` | '(default)'
element: `character`\+
character: <any character except `key_separator` and `value_separator`>
.. raw:: latex
\end{small}
The :token:`sep_definition` optional item offers the possibility to specify
the string used to separate the :token:`sub_key` from the :token:`value_name`
item. If not specified, the character ``;`` is used. Multiple
:token:`registry_query` items can be specified as part of a path.
.. code-block:: cmake
# example using default separator
find_file(... PATHS "/root/[HKLM/Stuff;InstallDir]/lib[HKLM\\\\Stuff;Architecture]")
# example using different specified separators
find_library(... HINTS "/root/[{|}HKCU/Stuff|InstallDir]/lib[{@@}HKCU\\\\Stuff@@Architecture]")
If the :token:`value_name` item is not specified or has the special name
``(default)``, the content of the default value, if any, will be returned. The
supported types for the :token:`value_name` are:
* ``REG_SZ``.
* ``REG_EXPAND_SZ``. The returned data is expanded.
* ``REG_DWORD``.
* ``REG_QWORD``.
When the registry query failed, typically because the key does not exist or
the data type is not supported, the string ``/REGISTRY-NOTFOUND`` is substituted
to the ``[]`` query expression.
.. _`Find Modules`:
Find Modules
@@ -242,70 +321,6 @@ backwards compatibility for any old names that were actually in use.
Make sure you comment them as deprecated, so that no-one starts using
them.
.. _`Find Using Windows Registry`:
Find Using Windows Registry
---------------------------
.. versionchanged:: 3.24
Options ``HINTS`` and ``PATHS`` of :command:`find_file`,
:command:`find_library`, :command:`find_path`, :command:`find_program`, and
:command:`find_package` commands offer the possibility, on ``Windows``
platform, to query the registry.
The formal syntax, as specified using
`BNF <https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form>`_ notation with
the regular extensions, for registry query is the following:
.. raw:: latex
\begin{small}
.. productionlist::
registry_query: '[' `sep_definition`? `root_key`
: ((`key_separator` `sub_key`)? (`value_separator` `value_name`_)?)? ']'
sep_definition: '{' `value_separator` '}'
root_key: 'HKLM' | 'HKEY_LOCAL_MACHINE' | 'HKCU' | 'HKEY_CURRENT_USER' |
: 'HKCR' | 'HKEY_CLASSES_ROOT' | 'HKCC' | 'HKEY_CURRENT_CONFIG' |
: 'HKU' | 'HKEY_USERS'
sub_key: `element` (`key_separator` `element`)*
key_separator: '/' | '\\'
value_separator: `element` | ';'
value_name: `element` | '(default)'
element: `character`\+
character: <any character except `key_separator` and `value_separator`>
.. raw:: latex
\end{small}
The :token:`sep_definition` optional item offers the possibility to specify
the string used to separate the :token:`sub_key` from the :token:`value_name`
item. If not specified, the character ``;`` is used. Multiple
:token:`registry_query` items can be specified as part of a path.
.. code-block:: cmake
# example using default separator
find_file(... PATHS "/root/[HKLM/Stuff;InstallDir]/lib[HKLM\\\\Stuff;Architecture]")
# example using different specified separators
find_library(... HINTS "/root/[{|}HKCU/Stuff|InstallDir]/lib[{@@}HKCU\\\\Stuff@@Architecture]")
If the :token:`value_name` item is not specified or has the special name
``(default)``, the content of the default value, if any, will be returned. The
supported types for the :token:`value_name` are:
* ``REG_SZ``.
* ``REG_EXPAND_SZ``. The returned data is expanded.
* ``REG_DWORD``.
* ``REG_QWORD``.
When the registry query failed, typically because the key does not exist or
the data type is not supported, the string ``/REGISTRY-NOTFOUND`` is substituted
to the ``[]`` query expression.
A Sample Find Module
--------------------