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\->Troubleshooting->Bugs, Features and Issues (NON-MAKEMSI)->Invalid ShortName Returned (File System Object)

BUG: Invalid ShortName Returned (File System Object)

MAKEMSI has detection code for Windows generating invalid shortnames (which should be in the standard "8.3" format). This bug affects file and folder onjects generated by the "file system object". Windows "fixes" suspected.

It appears that at least one reason for this is the registry entry "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsDisable8dot3NameCreation" having a value of 1 (normally 0). When its 1 (non zero?) then NTFS won't generate 8.3 filenames for future files and the file system object craps out.

The following code can also be used. You can take the contents and paste it into a file with a very long name (such as "BugDetectionForShortNameAttribute.vbs") and place it into a directory with long name and then simply execute it.

'----------------------------------------------------------------------------
'     MODULE NAME:   BugDetectionForShortNameAttribute.vbs
'
'         $Author:   USER "Dennis"  $
'       $Revision:   1.4  $
'           $Date:   12 Dec 2004 13:38:02  $
'        $Logfile:   C:/DBAREIS/Projects.PVCS/Win32/MakeMsi/BugDetectionForShortNameAttribute.vbs.pvcs  $
'
'     DESCRIPTION:   Looks for Windows .ShortName" bug.
'                    This VBS must have an invalid (log is easiest) 8.3 name
'                    and so should the name of the folder containing it.
'                    This script will then get shortnames for both and check
'                    if they are valid 8.3 names.
'----------------------------------------------------------------------------


'--- Initialization ---------------------------------------------------------
dim PgmVersion : PgmVersion = "04.345"
on error goto 0
set oFS     = MkObject("Scripting.FileSystemObject")
set oShell  = MkObject("WScript.Shell")
const RegNtfs83NamesTurnedOff = "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsDisable8dot3NameCreation"

'--- Get name of this script ------------------------------------------------
ScriptName = WScript.ScriptFullName


'--- Now Create Both a File and Folder Object -------------------------------
set oFile  = oFS.GetFile(ScriptName)
set oDir   = oFS.GetFolder(oFS.GetParentFolderName(ScriptName))


'--- Get shortnames and see if OK -------------------------------------------
Name83     = oFile.ShortName
Path83     = oFile.ShortPath
DirName83  = oDir.ShortName
DirPath83  = oDir.ShortPath
Failed = false
if oFS.FileExists(Path83) and instr(Path83, " ") = 0 then
   Path83State = "OK"
   CheckWith   = oFS.GetFileName(Path83)
else
   Failed      = true
   CheckWith   = ""
   Path83State = "INVALID? - Doesn't seem to exist!"
end if
if  ValidShortName(Name83, CheckWith) then
    Name83State = "OK"
else
    Failed      = true
    Name83State = "INVALID 8.3 NAME"
end if
if oFS.FolderExists(DirPath83) and instr(DirPath83, " ") = 0 then
   DirPath83State = "OK"
   CheckWith   = oFS.GetFileName(DirPath83)
else
   Failed      = true
   CheckWith   = ""
   DirPath83State = "INVALID? - Doesn't seem to exist!"
end if
if  ValidShortName(DirName83, CheckWith) then
    DirName83State = "OK"
else
    Failed      = true
    DirName83State = "INVALID 8.3 NAME"
end if

'--- Start the report... ----------------------------------------------------
T = "The name of this script is """ & ScriptName & """"                         & vbCRLF & vbCRLF
T = T & "Its shortpath (8.3) is """ & Path83 & """ ("    & Path83State & ")"    & vbCRLF
T = T & "Its shortname (8.3) is """ & Name83 & """ ("    & Name83State & ")"    & vbCRLF & vbCRLF
T = T & "The parent folder is """   & oDir.path & """"   & vbCRLF & vbCRLF
T = T & "Its shortpath (8.3) is """ & DirPath83 & """ (" & DirPath83State & ")" & vbCRLF
T = T & "Its shortname (8.3) is """ & DirName83 & """ (" & DirName83State & ")" & vbCRLF
if  Failed then
    T = T & vbCRLF & "The windows .ShortName() or .ShortPath() bug has been detected!" & vbCRLF
else
    T = T & vbCRLF & "No issues with .ShortName() or .ShortPath() detected!" & vbCRLF
end if


'--- Check if NTFS is turned off! -------------------------------------------
on error resume next
TurnedOff = oShell.RegRead(RegNtfs83NamesTurnedOff)
if  err.number <> 0 then
    NtfsState = "Warning: Can't determine whether or not NTFS shortnames are turned off. Reason: 0x" & hex(err.number) & " - " & err.description
    Failed    = true
else
    if  cint(TurnedOff) <> 0 then
        NtfsState = "Warning: NTFS shortnames ARE turned off (at """ & RegNtfs83NamesTurnedOff & """)!" & vbCRLF & "Only newly created files or folders will be without valid ShortName information."
        Failed    = true
    else
        NtfsState = "NTFS shortnames are not turned off (at """ & RegNtfs83NamesTurnedOff & """)."
    end if
end if
T = T & vbCRLF & vbCRLF & NtfsState


'--- Display the message ----------------------------------------------------
if  Failed then
    Icon = vbCritical
else
    Icon = vbInformation
    if Wscript.Arguments.Count = 1 then if ucase(Wscript.Arguments(0)) = "SILENT" then wscript.quit(0)
end if
MsgBox T, Icon, "Have .ShortName() bug? - v" & PgmVersion


'--- Finish up --------------------------------------------------------------
set oFile  = Nothing
set oDir  = Nothing


'============================================================================
function ValidShortName(ShortName, KnownValid83Name)
'============================================================================
    '--- Look for Windows Bug -----------------------------------------------
    dim Bits83
    ValidShortName = true
    Bits83 = split(ShortName, ".")
    if  ubound(Bits83) > 1 then
        '--- Only one "." allowed! ------------------------------------------
        ValidShortName = false
    else
        '--- Check the "8" part of the "8.3" filename -----------------------
        if  len(Bits83(0)) > 8 then
            ValidShortName = false
        else
            '--- Check the "3" part (if any) of the "8.3" filename ----------
            if  ubound(Bits83) = 1 then
                '--- There is an extension ----------------------------------
                if  len(Bits83(1)) > 3 then
                    ValidShortName = false
                end if
            end if
        end if
    end if
    if  ValidShortName and instr(ShortName, " ") <> 0 then
        '--- Log script name contains a space, does the short one? ----------
        ValidShortName = false
    end if

    '--- We may already know what it should be... ---------------------------
    if  ValidShortName and KnownValid83Name <> "" then
        if  ucase(ShortName) <> ucase(KnownValid83Name) then
            ValidShortName = false
        end if
    end if
end function


'============================================================================
function MkObject(ByVal AutomationClass)   'Create object, die on error
'============================================================================
   on error resume next
   set MkObject = CreateObject(AutomationClass)
   if  err.number <> 0 then
       MsgBox "Failed loading the automation class """ & AutomationClass & """." & vbCRLF & "This is likely to be due to a Windows configuration problem of some type." & vbCRLF & vbCRLF & "Reason 0x" & hex(err.number) & " - " & err.description, vbCritical, "CAN'T PERFORM REQUIRED VALIDATION!"
       wscript.quit 555
   end if
end function


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Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.