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ObQueryNameString function (ntifs.h)

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The ObQueryNameString routine supplies the name, if there is one, of a given object to which the caller has a pointer.

Syntax

NTSTATUS ObQueryNameString(
  [in]            PVOID                    Object,
  [out, optional] POBJECT_NAME_INFORMATION ObjectNameInfo,
  [in]            ULONG                    Length,
  [out]           PULONG                   ReturnLength
);

Parameters

[in] Object

A pointer to the object for which the name is requested. This parameter is required and cannot be NULL.

[out, optional] ObjectNameInfo

A pointer to a caller-allocated buffer, of the following type, that receives the object name information:

typedef struct _OBJECT_NAME_INFORMATION {
  UNICODE_STRING Name;
} OBJECT_NAME_INFORMATION, *POBJECT_NAME_INFORMATION;

This parameter is optional and can be NULL. If ObjectNameInfo is NULL, Length must be zero.

[in] Length

The size, in bytes, of the buffer that is pointed to by ObjectNameInfo. This parameter is optional and can be zero. If Length is zero, ReturnLength receives the size, in bytes, of the buffer that is needed to hold the object name information. A reasonable size for the buffer to accommodate most object names is 1024 bytes. If Length is zero, ObjectNameInfo can be NULL.

[out] ReturnLength

A pointer to a caller-allocated variable that receives the size, in bytes, of the returned object name information. The object name (when present) includes a NULL-terminator and all path separators "\" in the name. If ObQueryNameString returns STATUS_INFO_LENGTH_MISMATCH, it sets this parameter to the required buffer length.

Return value

ObQueryNameString returns STATUS_SUCCESS or an NTSTATUS value such as the following:

Return code Description
STATUS_INFO_LENGTH_MISMATCH
 The buffer that is pointed to by ObjectNameInfo is too small to hold the requested object name information. ReturnLength points to the required buffer size. In this case, no object name information is returned. This is an error code. Be aware that if Length is set to zero, STATUS_INFO_LENGTH_MISMATCH is returned.

Remarks

If the given object is named and the object name was successfully acquired, the returned string is the name of the given object including as much of the object's full path as possible. In this case, ObQueryNameString sets Name.Buffer to the address of the NULL-terminated name of the specified object. The value of Name.MaximumLength is the length of the object name including the NULL termination. The value of Name.Length is length of the only the object name.

If the given object is unnamed, or if the object name was not successfully acquired, ObQueryNameString sets Name.Buffer to NULL and sets Name.Length and Name.MaximumLength to zero.

The storage for ObjectNameInfo can be allocated from paged or nonpaged pool.

Requirements

Requirement Value
Minimum supported client Windows 2000
Target Platform Universal
Header ntifs.h (include FltKernel.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL < DISPATCH_LEVEL

See also

UNICODE_STRING