File in use

[speedy6]

Can i check if a file is being used?

[martin]

Can i check if a file is being used?

There might be simpler ways to do it so see what other replies you get, but here is a link to a way to do it with WMI

page 548 on. Looks like this could be done in AutoIt quite easily.

[PsaltyDS]

This version of it works, but only if it's open via a CIFS share, because it accesses the object via LanManServer, not the local FileSystemObject:

$varFile= "C:\Temp\Test.txt"
$objFS = ObjGet("WinNT://" & @ComputerName & "/lanmanserver", "fileservice")
$varFoundNone = True
$sMsg = ""
For $objRes in $objFS.Resources
    If $objRes.Path = $varFile Then
        $varFoundNone = False
        $sMsg &= $objRes.User & ", "
    EndIf
Next
If $varFoundNone Then
      MsgBox(64, "No Result", "Didn't find that file opened by anyone.")
  Else
      MsgBox(64, "Result", "Found file in use by: " & StringTrimRight($sMsg, 2))
EndIf

Third party apps can tell if a file is in use, but I don't see how to get that in the scripting environment without doing something that will CHANGE the file, like attempting to open it for append then closing it immediately.

[speedy6]

So there's no other way...

Beacause i wanne check if an other application is using a xml file, if so, stay away from it...

Is that possible with you're code?

[Glyph]

without doing something that will CHANGE the file, like attempting to open it for append then closing it immediately.

try that..?

[speedy6]

try that..?

Whill do thx

[dabus]

Try this:

I think it's from larry, do a search and figure out the things you need to know...

$a = _RealFileOpen("D:\Daten\Text\UltimateFAQ.cc3")
MsgBox(4096,"",$a)
_RealFileClose($a)

Func _RealFileOpen( $szFile )
   Local $GENERIC_READ = 0x80000000 
   Local $OPEN_EXISTING = 3 
   Local $FILE_ATTRIBUTE_NORMAL = 0x00000080
   Local $RFO_h
   $RFO_h = DllCall( "kernel32.dll", "hwnd", "CreateFile", _
                "str", $szFile, _
                "long", $GENERIC_READ, _
                "long", 0, _
                "ptr", 0, _
                "long", $OPEN_EXISTING, _
                "long", $FILE_ATTRIBUTE_NORMAL, _
                "long", 0 )
   Return $RFO_h[0]
EndFunc

Func _RealFileClose( $hFile )
   Local $RFC_r

   $RFC_r = DllCall( "kernel32.dll", "int", "CloseHandle", _
                     "hwnd", $hFile )

   Return $RFC_r[0]
EndFunc

[PsaltyDS]

Try this:

I think it's from larry, do a search and figure out the things you need to know...

$a = _RealFileOpen("D:\Daten\Text\UltimateFAQ.cc3")
MsgBox(4096,"",$a)
_RealFileClose($a)

Func _RealFileOpen( $szFile )
   Local $GENERIC_READ = 0x80000000 
   Local $OPEN_EXISTING = 3 
   Local $FILE_ATTRIBUTE_NORMAL = 0x00000080
   Local $RFO_h
   $RFO_h = DllCall( "kernel32.dll", "hwnd", "CreateFile", _
                "str", $szFile, _
                "long", $GENERIC_READ, _
                "long", 0, _
                "ptr", 0, _
                "long", $OPEN_EXISTING, _
                "long", $FILE_ATTRIBUTE_NORMAL, _
                "long", 0 )
   Return $RFO_h[0]
EndFunc

Func _RealFileClose( $hFile )
   Local $RFC_r

   $RFC_r = DllCall( "kernel32.dll", "int", "CloseHandle", _
                     "hwnd", $hFile )

   Return $RFC_r[0]
EndFunc

This will tell you if it doesn't exist, is ReadOnly, or is already opened exclusively by another app. Notepad.exe opening a file isn't detected because it only works with an memory image of the file and doesn't hold it in an open state.

Edit: Corrected note about Notepad.exe.

Edited October 18, 2007 by PsaltyDS

[Siao]

Note this will not tell you if the file is opened non-exclusively for Read (i.e. Notepad is viewing it). But will tell you if it doesn't exist, is ReadOnly, or is already opened exclusively by another app.

Not exactly. That CreateFile should return error if a file already has a handle opened in any access mode and any share rights, because you specify that you don't want to share it, which makes unimportant which share rights the other app has opened it with.

Notepad in this case is a bad test subject, because it does not keep the file open. It opens the file, reads it into memory and then closes the file. So technically the file is not open = unused.

Edited October 18, 2007 by Siao

[PsaltyDS]

Not exactly. That CreateFile should return error if a file already has a handle opened in any access mode and any share rights, because you specify that you don't want to share it, which makes unimportant which share rights the other app has opened it with.

Notepad in this case is a bad test subject, because it does not keep the file open. It opens the file, reads it into memory and then closes the file. So technically the file is not open = unused.

Fair enough... it still works!

Thanks for the correction, I edited the post.

[Champak]

I am having a problem with this. I'm trying to detect if an audio file is being used by another app and this isn't working....at least with the particular apps I have that are using the audio file. Not all audio apps show that they are using an audio file it seems, maybe they are operating like notepad...although I can't see why an audio app would do that. I even tried to see if they are creating temp copies and using those, but that isn't the case. Are there any other solutions or workarounds? Is there a way to see if a file is in memory? But along with that question comes, if it is read to memory to play back, is it deleted from memory after playback?...which is what I would need for that scenario.

So anything?

Thanks.

[Squirrely1]

@speedy6 - tell us more about the situation: are you writing a script for general use or only for you? If it is more certainly another audio player the name of which is known, you could check for the the existence of its process, and nest some code that would check its "playlist now-playing" file using some COM objects:

If ProcessExists("wmplayer.exe") Then
    If COM_Code() Then
    ;...
    EndIf
EndIf

Edited March 22, 2008 by Squirrely1

[Champak]

bump

[ptrex]

@all

Go to Google type : Unlocker

Perfect tool for this.

regards

ptrex