REG_OPTION_VOLATILE和REG_OPTION_NON_VOLATILE

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重启电脑创建的注册表键值丢失原因

REG_OPTION_VOLATILE 这个参数的意思是创建的注册表键值都位于内存中，不会保存到相应的注册表文件中。

英文如下：

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. TheRegSaveKey function does not save volatile registry keys. This flag is ignored for keys that already exist.

所以，重启后这些键值当然就没有了。

解决办法

很简单，使用REG_OPTION_NON_VOLATILE 即可

RegCreateKeyEx(HKEY_CURRENT_USER, DemoRegKey, 0, NULL, REG_OPTION_NON_VOLATILE            , KEY_ALL_ACCESS   , NULL   , &hKey, NULL);

REG_OPTION_VOLATILE可以用在测试上。一重启，之前创建的键值都没了。

而若想重启之后注册表键值也仍然保留的话就用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.

ValueDescriptionREG_OPTION_NON_VOLATILEDefault setting. All registry keys are created as non-volatile and the information stored in memory is preserved when the OS is restarted. TheRegSaveKey function saves keys that are non-volatile.REG_OPTION_VOLATILEAll 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. TheRegSaveKey function does not save volatile registry keys. This flag is ignored for keys that already exist.

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