RegOpenKeyEx
A version of this page is also available for
4/8/2010
This function opens the specified key.
A remote application interface (RAPI) version of this function exists called CeRegOpenKeyEx (RAPI).
Syntax
LONG RegOpenKeyEx(
HKEY hKey,
LPCWSTR lpSubKey,
DWORD ulOptions,
REGSAM samDesired,
PHKEY phkResult
);
Parameters
hKey
[in] Handle to a currently open key or any of the following predefined reserved handle values:- HKEY_LOCAL_MACHINE
- HKEY_CLASSES_ROOT
- HKEY_CURRENT_USER
- HKEY_USERS
Windows Embedded CE does not support the HKEY_CURRENT_CONFIG, HKEY_PERFORMANCE_DATA, or HKEY_DYN_DATA predefined reserved handle values.
- lpSubKey
[in] Pointer to a null-terminated string containing the name of the subkey to open. If this parameter is set to NULL or a pointer to an empty string, the function opens a new handle to the key identified by hKey. In this case, the function does not close the handles previously opened.
- ulOptions
[in] Reserved. Set to zero.
- samDesired
[in] Not supported. Set to zero.
- phkResult
[out] Pointer to a variable that receives a handle to the opened key. When you no longer need the returned handle, call the RegCloseKey function to close it.
Return Value
ERROR_SUCCESS indicates success. A nonzero error code defined in Winerror.h indicates failure. To get a generic description of the error, call the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag set. The message resource is optional, so FormatMessage might fail.
Remarks
Unlike the RegCreateKeyEx function, this function does not create the specified key if the key does not exist in the registry.
Requirements
| Header | winreg.h |
| Library | coredll.lib |
| Windows Embedded CE | Windows CE 1.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |
See Also
Reference
Registry Functions
RegCreateKeyEx
RegDeleteKey