#ifndef _NTREGAPI_H

/**
 * The KEY_NAME_INFORMATION structure holds the name and name length of the key.
 * \sa https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/ns-ntddk-_key_name_information
 */
typedef struct _KEY_NAME_INFORMATION
{
    ULONG NameLength;                               // The size, in bytes, of the key name string in the Name array.
    _Field_size_bytes_(NameLength) WCHAR Name[1];   // The name of the registry key. This string is not null-terminated.
} KEY_NAME_INFORMATION, *PKEY_NAME_INFORMATION;

#endif
View code on GitHub

// ntddk.h

typedef struct _KEY_NAME_INFORMATION {
  ULONG NameLength;
  WCHAR Name[1];
} KEY_NAME_INFORMATION, *PKEY_NAME_INFORMATION;
View the official Windows Driver Kit DDI reference

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This structure is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (ns-ntddk-_key_name_information)

_KEY_NAME_INFORMATION structure

Description

The KEY_NAME_INFORMATION structure holds the name and name length of the key.

Members

`NameLength`

The size, in bytes, of the key name string in the Name array.

`Name`

An array of wide characters that contains the name of the key. This character string is not null-terminated. Only the first element in this array is included in the KEY_NAME_INFORMATION structure definition. The storage for the remaining elements in the array immediately follows this element.

Remarks

The ZwQueryKey routine uses the KEY_NAME_INFORMATION structure to contain the registry key name. When the KeyInformationClass parameter of this routine is KeyNameInformation, the KeyInformation buffer is treated as a KEY_NAME_INFORMATION structure. For more information about the KeyNameInformation enumeration value, see KEY_INFORMATION_CLASS.

KEY_NAME_INFORMATION - NtDoc