.. highlightlang:: us

.. index:: RegOpen

.. _regopen:

RegOpen
=======

.. us.tag  RegOpen ENGLISH Registry New300 Changed5200 Changed5513

Opens a registry key.

.. function::  bool = RegOpen(ssSubKey)
               bool = RegOpen(ssSubKey, options)

.. us.return

**Return Value**

*bool* is nonzero if key was successfully opened, otherwise 0.

.. us.params

**Parameters**

.. uparam:: ssSubKey

   Name of key to open.

.. uparam:: options

   *options* is 0x0200 (KEY_WOW64_32KEY) or 0x0100 (KEY_WOW64_64KEY). This
   parameter is optional. Default value depends on the bit value of
   uniplot.exe.

.. us.history

**History**

.. list-table::
   :header-rows: 1

   * - Version
     - Description
   * - R2013.13
     - Behavior of 5.20.0 removed, instead 2. parameter *options* added.
   * - 5.20.0
     - Under 64-bit-Windows the functions first tries to open the key in the
       64-bit registry hive. If that fails it tries to open the key in the 32-bit
       registry hive.
   * - 5.3.0
     - Bug (ID1218)::ref:`RegOpen` failed for elements in the registry where the
       user had only read access rights because UniPlot tried to open the key
       with read and write access. Now these keys will be opened with read access
       only.

.. seealso::
   :ref:`overview-application-object`,
   :ref:`RegCreate`,
   :ref:`RegSetValue`

:sub:`id-1314839`