Modern Fs FileId

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FileId

Holds a volume and file number that are equal for every name of one file.

Syntax

type FileId
    as ulongint Device    '' volume serial (Windows) / st_dev (POSIX)
    as ulongint IdHigh    '' high half of the 128-bit file id on Windows; 0 on POSIX
    as ulongint IdLow     '' low half / st_ino
end type
operator =, <>

Notes

• Two FileIds are equal when both name the same file on the same volume -- through a hard link, a symbolic link followed, or a path spelled differently.
• Not a FileInfo field: on Windows it needs an open handle, so Stat does not pay for it. Ask with GetFileId or File.Id.

Examples

#import "std/fs"
#import "std/chrono"
using fs

dim as ustring dir_ = CreateTempDir( "tkdoc" ).Value( )
dim as ustring p = PathJoin( dir_, "f.txt" )
WriteAllText( p, "x" )
dim as FileId a = GetFileId( p ).Value( )
print a = GetFileId( PathJoin( dir_, ".", "f.txt" ) ).Value( )    '' true

RemoveDirAll( dir_ )

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Library: Filesystem Library Category: Filesystem Documented under: Metadata