hKey
[in] Handle to a currently open key or one of the following predefined reserved handle values:
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
Windows CE does not support the HKEY_CURRENT_CONFIG, HKEY_PERFORMANCE_DATA, or HKEY_DYN_DATA predefined reserved handle values.
The key opened or created by the RegCreateKeyEx function is a subkey of the key identified by the hKey parameter.
lpSubKey
[in] Pointer to a null-terminated string specifying the name of a subkey that this function opens or creates. The subkey specified must be a subkey of the key identified by the hKey parameter. This subkey must not begin with the backslash character (/). If the parameter is NULL, then RegCreateKeyEx behaves like RegOpenKey where it opens the key specified by hKey. In Windows CE, the maximum length of a key name is 255 characters, not including the terminating NULL character. You can also only nest 16 levels of sub-keys in Windows CE.
Reserved
[in] Reserved; set to 0.
lpClass
[in] Pointer to a null-terminated string that specifies the class (object type) of this key. This parameter is ignored if the key already exists. In Windows CE, the maximum length of a class string is 255 characters, not including the terminating NULL character.
dwOptions
[in] Registry key options.
REG_OPTION_NON_VOLATILE :Default setting. All registry keys are created as non-volatile and the information stored in memory is preserved when the OS is restarted. The RegSaveKey function saves keys that are non-volatile.
REG_OPTION_VOLATILE :All registry keys are created as volatile, and the information is stored in memory and is not preserved when the corresponding registry hive is unloaded. For HKEY_LOCAL_MACHINE, this occurs when the OS is shut down. The RegSaveKey function does not save volatile registry keys. This flag is ignored for keys that already exist.
samDesired
[in] Ignored; set to 0 to ensure compatibility with future versions of Windows CE.
lpSecurityAttributes
[in] Set to NULL. Windows CE automatically assigns the key a default security descriptor.
phkResult
[out] Pointer to a variable that receives a handle to the opened or created key. When you no longer need the returned handle, call the RegCloseKey function to close it.
lpdwDisposition
[out] Pointer to a variable that receives disposition values. The following table shows possible values for this parameter. Value Description
REG_CREATED_NEW_KEY The key did not exist and was created.
REG_OPENED_EXISTING_KEY The key existed and was simply opened without being changed.