Opens a specified registry key by accessing the Windows registry routine RegOpenKey.
Usage
Call "REG_OPEN_KEY"
USING OPEN-KEY-HANDLE, SUBKEY-TO-BE-OPENED,
SUBKEY-HANDLE,
GIVING STATUS-CODE
Parameters
OPEN-KEY-HANDLE Usage unsigned-long
Handle of a currently open key or one of the following predefined handles of keys that are always open (defined in acugui.def):
HKEY_CLASSES_ROOT_31 [for Windows 3.1] HKEY_CLASSES_ROOT HKEY_CURRENT_USER HKEY_LOCAL_MACHINE HKEY_USERS
SUBKEY-TO-BE-OPENED PIC X(n)
String containing the name of the key to open. This key must be a subkey of the key identified by OPEN-KEY-HANDLE.
SUBKEY-HANDLE Usage unsigned-long
Data item to receive the handle of the opened key.
STATUS-CODE Numeric data item
Receives the return status of the call to Microsoft's "RegOpenKey" function. A return status of zero indicates success; non-zero indicates that an error occurred.
Comments
You can use REG_OPEN_KEY to open a key several layers deep in the registry tree structure. For example, if you set SUBKEY-TO-BE-OPENED to a string of the form:
"level_1\level_2\level_3"
this would open the key "level_3", where "level_3" is a subkey of "level_2", "level_2" is a subkey of "level_1", and "level_1" is a subkey of the key specified by OPEN-KEY-HANDLE.