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Detecting NTFS symlinks

Alomax
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Alomax Seeker

Alomax

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Thanks to many of you already who have posted example scripts and good questions that have already helped me on this project (unbeknownst to you). :)

I have written a program that updates and maintains a list of programs and games across a network. Some of them are copied from a central server to the clients, others are symlinked. They are all checked every time the computer starts up to make sure their version is current and critical files are present. I have however run into a quirk that I cannot find a solution for.

When an update is determined to be required, programs that are symlinked are simply deleted locally and re-linked using a file list from the server.

When an update is required for a program that is flagged as "copy", I call robocopy with flags telling it only to update files that are newer or not present.

The odd quirk that I have just found is that I have a game that I tried to run as a symlink, but it didn't like running multiple instances (locks data files during runtime). So I switched its flag to copy. However the script scans the directory, which is linked back to the master copy, and sees that everything is already up to date, because it's looking at itself. :(

What I need is a function to determine if a local file/directory is "real" or a symbolic link. I've looked through the help file but I can't find anything, and apparently nobody's posted anything about it on the forum, or I'm using the wrong keywords to search.

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ptrex Universalist

ptrex

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@

Maybe this can help

Junction v1.02 - Win2K junction creator and reparse point viewer

Copyright © 2000 Mark Russinovich

Systems Internals - http://www.sysinternals.com

The first usage is for displaying reparse point information, and the

second usage is for creating or deleting a NTFS junction point:

usage: C:\Sys Internals\Junction\JUNCTION.EXE [-s] <file or directory>

-s Recurse subdirectories

usage: C:\Sys Internals\Junction\JUNCTION.EXE [-d] <junction directory> [<junction target>]

-d Delete the specified junction

example: junction d:\link c:\winnt

Download the Junction.exe from the MS site (previously called Sys Internals)

regards

ptrex

Contributions :Firewall Log Analyzer for XP - Creating COM objects without a need of DLL's - UPnP support in AU3Crystal Reports Viewer - PDFCreator in AutoIT - Duplicate File FinderSQLite3 Database functionality - USB Monitoring - Reading Excel using SQLRun Au3 as a Windows Service - File Monitor - Embedded Flash PlayerDynamic Functions - Control Panel Applets - Digital Signing Code - Excel Grid In AutoIT - Constants for Special Folders in WindowsRead data from Any Windows Edit Control - SOAP and Web Services in AutoIT - Barcode Printing Using PS - AU3 on LightTD WebserverMS LogParser SQL Engine in AutoIT - ImageMagick Image Processing - Converter @ Dec - Hex - Bin -Email Address Encoder - MSI Editor - SNMP - MIB ProtocolFinancial Functions UDF - Set ACL Permissions - Syntax HighLighter for AU3ADOR.RecordSet approach - Real OCR - HTTP Disk - PDF Reader Personal Worldclock - MS Indexing Engine - Printing ControlsGuiListView - Navigation (break the 4000 Limit barrier) - Registration Free COM DLL Distribution - Update - WinRM SMART Analysis - COM Object Browser - Excel PivotTable Object - VLC Media Player - Windows LogOnOff Gui -Extract Data from Outlook to Word & Excel - Analyze Event ID 4226 - DotNet Compiler Wrapper - Powershell_COM  - New

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MHz Universalist

MHz

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GetFileAttributes can get the attributes of a symblic link though a flag for detecting a reparse point. The flag also does a symbolic link so not sure of it's accuracy ensuring for certain of symbolic link detection but it tests OK with my brief check with Vista SP1.

; example: returns true if the file is a symbolic link
$var = _ReparsePoint('C:\test.txt')
MsgBox(0, '', $var)

Func _ReparsePoint($string)
    Local $FILE_ATTRIBUTE_REPARSE_POINT = 0x400
    If Not FileExists($string) Then
        Return SetError(1, 0, '')
    EndIf
    $rc = DllCall('kernel32.dll', 'Int', 'GetFileAttributes', 'str', $string)
    If IsArray($rc) Then
        If BitAND($rc[0], $FILE_ATTRIBUTE_REPARSE_POINT) = $FILE_ATTRIBUTE_REPARSE_POINT Then
            Return True
        EndIf
    EndIf
    Return False
EndFunc

:)

Edited by MHz
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ptrex Universalist

ptrex

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@MHZ

More advanced than what I have suggested :)

regards

ptrex

Contributions :Firewall Log Analyzer for XP - Creating COM objects without a need of DLL's - UPnP support in AU3Crystal Reports Viewer - PDFCreator in AutoIT - Duplicate File FinderSQLite3 Database functionality - USB Monitoring - Reading Excel using SQLRun Au3 as a Windows Service - File Monitor - Embedded Flash PlayerDynamic Functions - Control Panel Applets - Digital Signing Code - Excel Grid In AutoIT - Constants for Special Folders in WindowsRead data from Any Windows Edit Control - SOAP and Web Services in AutoIT - Barcode Printing Using PS - AU3 on LightTD WebserverMS LogParser SQL Engine in AutoIT - ImageMagick Image Processing - Converter @ Dec - Hex - Bin -Email Address Encoder - MSI Editor - SNMP - MIB ProtocolFinancial Functions UDF - Set ACL Permissions - Syntax HighLighter for AU3ADOR.RecordSet approach - Real OCR - HTTP Disk - PDF Reader Personal Worldclock - MS Indexing Engine - Printing ControlsGuiListView - Navigation (break the 4000 Limit barrier) - Registration Free COM DLL Distribution - Update - WinRM SMART Analysis - COM Object Browser - Excel PivotTable Object - VLC Media Player - Windows LogOnOff Gui -Extract Data from Outlook to Word & Excel - Analyze Event ID 4226 - DotNet Compiler Wrapper - Powershell_COM  - New

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  • 4 years later...
guinness Universalist

guinness

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Search the Forum for _IsJunction.

UDF List:

 
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Updated: 22/04/2018

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