REG_OPTION_NON_VOLATILE

REG_OPTION_NON_VOLATILE：

该宏是RegCreateKeyEx函数的参数可选项。

LONG RegCreateKeyEx( HKEY hKey,

LPCWSTR lpSubKey,

DWORD Reserved,

LPWSTR lpClass,

DWORD dwOptions,

REGSAM samDesired,

LPSECURITY_ATTRIBUTES lpSecurityAttributes,

PHKEY phkResult,

LPDWORD lpdwDisposition );

看看MSDN对它的说明：

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.

翻译：默认设置。所有注册表项创建作为非易失性和操作系统重新启动时保留在内存中存储的信息。 RegSaveKey功能键是非易失性保存。

意思是说如果参数dwOptions选择REG_OPTION_NON_VOLATILE，则通过RegCreateKeyEx创建的注册表是永久的，不会因为计算机的重启而消失。相反参数选择REG_OPTION_VOLATILE，则表明创建的注册表是临时的，计算机重启后该注册表不存在。

dwOptions

[in] Registry key options. The following table shows the possible values for this parameter.

Value Description

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.

参考资料：http://msdn.microsoft.com/en-us/library/ms891450.aspx