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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| advapi32.lib
| Header File
| winreg.h
| Unicode
| WinNT
| Platform Notes
| None
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RegOpenKeyEx
The RegOpenKeyEx function opens the specified key.
LONG RegOpenKeyEx(
HKEY hKey,
| // handle of open key
| LPCTSTR lpSubKey,
| // address of name of subkey to open
| DWORD ulOptions,
| // reserved
| REGSAM samDesired,
| // security access mask
| PHKEY phkResult
| // address of handle of open key
| );
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Parameters
hKey
Identifies a currently open key or any of the following predefined reserved
handle values:
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
lpSubKey
Points to a null-terminated string containing the name of the subkey to open.
If this parameter is NULL or a pointer to an empty string, the function will
open a new handle of the key identified by the hKey parameter. In this case, the function will 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:
Value
| Meaning
| 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.
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phkResult
Points to a variable that receives the handle of the opened key.
Return Values
If the function succeeds, the return value is ERROR_SUCCESS.
If the function fails, the return value is a nonzero error code defined in
WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic
description of the error.
Remarks
Unlike the RegCreateKeyEx function, the RegOpenKeyEx function does not create the specified key if the key does not exist in the
registry.
See Also
RegCloseKey, RegCreateKeyEx, RegDeleteKey, RegOpenKey
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