2.4.21 FileIdBothDirectoryInformation
This information class is used in directory enumeration to return detailed information about the contents of a directory.
This information class returns a list that contains a FILE_ID_BOTH_DIR_INFORMATION data element for each file or directory within the target directory.
When multiple FILE_ID_BOTH_DIR_INFORMATION data elements are present in the buffer, each MUST be aligned on an 8-byte boundary. Any bytes inserted for alignment SHOULD be set to zero, and the receiver MUST ignore them. No padding is required following the last data element.
A FILE_ID_BOTH_DIR_INFORMATION data element is as follows.
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NextEntryOffset |
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FileIndex |
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CreationTime |
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LastAccessTime |
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LastWriteTime |
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ChangeTime |
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EndOfFile |
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AllocationSize |
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FileAttributes |
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FileNameLength |
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EaSize |
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ShortNameLength |
Reserved1 |
ShortName (24 bytes) |
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Reserved2 |
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FileId |
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FileName (variable) |
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NextEntryOffset (4 bytes): A 32-bit unsigned integer that contains the byte offset from the beginning of this entry, at which the next FILE_ID_BOTH_DIR_INFORMATION entry is located, if multiple entries are present in the buffer. This member MUST be zero if no other entries follow this one. An implementation MUST use this value to determine the location of the next entry (if multiple entries are present in a buffer).
FileIndex (4 bytes): A 32-bit unsigned integer that contains the byte offset of the file within the parent directory. For file systems in which the position of a file within the parent directory is not fixed and can be changed at any time to maintain sort order, this field SHOULD be set to 0 and MUST be ignored.<123>
CreationTime (8 bytes): The time when the file was created; see section 2.1.1. The value of this field MUST be greater than or equal to 0.
LastAccessTime (8 bytes): The last time the file was accessed; see section 2.1.1. The value of this field MUST be greater than or equal to 0.
LastWriteTime (8 bytes): The last time information was written; see section 2.1.1. The value of this field MUST be greater than or equal to 0.
ChangeTime (8 bytes): The last time the file was changed; see section 2.1.1. The value of this field MUST be greater than or equal to 0.
EndOfFile (8 bytes): A 64-bit signed integer that contains the absolute new end-of-file position as a byte offset from the start of the file. EndOfFile specifies the offset to the byte immediately following the last valid byte in the file. Because this value is zero-based, it actually refers to the first free byte in the file. That is, it is the offset from the beginning of the file at which new bytes appended to the file will be written. The value of this field MUST be greater than or equal to 0.
AllocationSize (8 bytes): A 64-bit signed integer that contains the file allocation size, in bytes. The value of this field MUST be an integer multiple of the cluster size.
FileAttributes (4 bytes): A 32-bit unsigned integer that contains the file attributes. Valid attributes are as specified in section 2.6.
FileNameLength (4 bytes): A 32-bit unsigned integer that specifies the length, in bytes, of the file name contained within the FileName member.
EaSize (4 bytes): If FILE_ATTRIBUTE_REPARSE_POINT is set in the FileAttributes field, this field MUST contain a reparse tag as specified in section 2.1.2.1. Otherwise, this field is a 32-bit unsigned integer that contains the combined length, in bytes, of the extended attributes (EA) for the file.
ShortNameLength (1 byte): A 8-bit signed integer that specifies the length, in bytes, of the file name contained within the ShortName member.
Reserved1 (1 byte): An 8-bit field. This field is reserved. This field MUST be set to zero, and MUST be ignored.
ShortName (24 bytes): A sequence of Unicode characters containing the short (8.3) file name. When working with this field, use ShortNameLength to determine the length of the file name rather than assuming the presence of a trailing null delimiter.
Reserved2 (2 bytes): A 16-bit field. This field is reserved. This field MUST be set to zero, and MUST be ignored.
FileId (8 bytes): The 64-bit file ID, as specified in section 2.1.9, for the file. For file systems that do not support a 64-bit file ID, this field MUST be set to 0, and MUST be ignored. For file systems which do not explicitly store directory entries named ".." (synonymous with the parent directory), an implementation MAY set this field to 0 for the entry named "..", and this value MUST be ignored.<124>
FileName (variable): A sequence of Unicode characters containing the file name. When working with this field, use FileNameLength to determine the length of the file name rather than assuming the presence of a trailing null delimiter. Dot directory names are valid for this field. For more details, see section 2.1.5.1.
This operation returns a status code as specified in section 2.2. Upon success, the status code returned by the function that processes this file information class is STATUS_SUCCESS. The most common error codes are listed in the following table.
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Error code |
Meaning |
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STATUS_INFO_LENGTH_MISMATCH 0xC0000004 |
The specified information record length does not match the length that is required for the specified information class. |