REG_QUERY_KEY_INFORMATION structure (wdm.h)
The REG_QUERY_KEY_INFORMATION structure describes the metadata that is about to be queried for a key.
Syntax
typedef struct _REG_QUERY_KEY_INFORMATION {
PVOID Object;
KEY_INFORMATION_CLASS KeyInformationClass;
PVOID KeyInformation;
ULONG Length;
PULONG ResultLength;
PVOID CallContext;
PVOID ObjectContext;
PVOID Reserved;
} REG_QUERY_KEY_INFORMATION, *PREG_QUERY_KEY_INFORMATION;
Members
Object
A pointer to the registry key object for the key whose metadata is about to be queried.
KeyInformationClass
The KEY_INFORMATION_CLASS value that indicates the type of information to be returned by the system.
KeyInformation
A pointer to a buffer that contains the information to be returned by the system. The format of the buffer depends on the value of KeyInformationClass. For more information see KEY_INFORMATION_CLASS.
Length
Specifies the size, in bytes, of the KeyInformation buffer.
ResultLength
Pointer to a variable that receives (from the system) the amount of valid data, in bytes, in the KeyInformation buffer.
CallContext
Optional driver-defined context information that the driver's RegistryCallback routine can supply. This member is defined for Windows Vista and later versions of the Windows operating system.
ObjectContext
A pointer to driver-defined context information that the driver has associated with a registry object by calling CmSetCallbackObjectContext. This member is defined for Windows Vista and later versions of the Windows operating system.
Reserved
This member is reserved for future use. This member is defined for Windows Vista and later versions of the Windows operating system.
Remarks
The system passes this structure to the RegistryCallback routine every time a thread attempts to query the metadata for a key—for example, when a user-mode thread calls RegQueryInfoKey or when a driver calls ZwQueryKey.
For more information about registry filtering operations, see Filtering Registry Calls.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available on Microsoft Windows XP and later versions of the Windows operating system. |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |