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RegOpenKeyEx (iwin32)
INtime SDK v6 > About INtime > Alternate APIs > iwin32 API > iwin32 API > RegOpenKeyEx (iwin32)

Opens the specified registry key.

LONG RegOpenKeyEx(
    HKEY hKey,
    LPCTSTR lpSubKey,
    DWORD ulOptions,
    REGSAM samDesired,
    PHKEY phkResult
);

Parameters

hKey
Handle to a currently open key or any of these predefined reserved handle values:

HKEY_CLASSES_ROOT HKEY_CURRENT_CONFIG HKEY_CURRENT_USER HKEY_LOCAL_MACHINE HKEY_USERS HKEY_PERFORMANCE_DATA

lpSubKey
Pointer to a null-terminated string that contains the name of the subkey to open. If this parameter is NULL or a pointer to an empty string, the call opens a new handle to the key identified by the hKey parameter. In this case, the call does not close the handles previously opened.
ulOptions
Reserved; must be zero.
samDesired
Specifies an access mask that describes the desired security access for the new key. This parameter can be a combination of the following values:
KEY_ALL_ACCESS Combination of KEY_QUERY_VALUE, KEY_ENUMERATE_SUB_KEYS, KEY_NOTIFY, KEY_CREATE_SUB_KEY, KEY_CREATE_LINK, and KEY_SET_VALUE access.
KEY_CREATE_LINK Permission to create a symbolic link.
KEY_CREATE_SUB_KEY Permission to create subkeys.
KEY_ENUMERATE_SUB_KEYS Permission to enumerate subkeys.
KEY_EXECUTE Permission for read access.
KEY_NOTIFY Permission for change notification.
KEY_QUERY_VALUE Permission to query subkey data.
KEY_READ Combination of KEY_QUERY_VALUE, KEY_ENUMERATE_SUB_KEYS, and KEY_NOTIFY access.
KEY_SET_VALUE Permission to set subkey data.
KEY_WRITE Combination of KEY_SET_VALUE and KEY_CREATE_SUB_KEY access.
phkResult
Pointer to a variable that receives a handle to the opened key. When you no longer need the returned handle, call RegCloseKey to close it.

Remarks

Unlike RegCreateKeyEx, RegOpenKeyEx does not create the specified key if the key does not exist in the registry.

Return Values

ERROR_SUCCESS
Success.
A nonzero status code defined in RTWIN32.H.
Failure. For extended error information, see GetLastError

Requirements

Versions Defined in Include Link to
INtime 3.0 intime/rt/include/iwin32.h iwin32.h
iwin32rt.h
rt.lib

Note

This function operates in the real-time portion of your application.

See Also

RegCloseKey, RegCreateKeyEx, RegDeleteKey, iwin32 API, iwin32 Overview