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File being used by the system in vb 6

Posted on 2009-05-11
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Last Modified: 2013-12-26
is there a way that i can know if a file is being used by the systems, in this case i want to know if a printer is using a file
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Question by:cano63
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by:JohnBPrice
ID: 24355996

If you get FileMon from Sysinternals.com, and then print, it will show you every file that is touched by any process.  You can filter it by filename or process.
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by:cano63
ID: 24356500
? can you give an example is in vb 6.0
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by:cano63
ID: 24356531
ok but i need to make it with code  in Vb 6.0
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by:JohnBPrice
ID: 24356773
OK, I don't understand what you are trying to do then.  What file are you interested in?  When you said "if a file is being used by the systems" I thought you meant a system file that perhaps you wanted to delete or at least identify if it was required.
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by:cano63
ID: 24359920
i want to know by code if a file is being used by the system. i have to delete a file after he's been printed, but i need to know if the systems have cotrol over it or if it is free to delete it
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by:JohnBPrice
ID: 24363772
You could simply try to delete it and see if you get an error.  
You could try to create it exclusively and see if you get an error, see http://www.eggheadcafe.com/conversation.aspx?messageid=30057905&threadid=30031602
(code below)
You can get info about files, but it is a lot of work, see
http://msdn.microsoft.com/en-us/library/aa364949(VS.85).aspx

'-----------------------------------------------------------
' FUNCTION: FileInUse
' Determines whether the specified file is currently in use
'
' IN: [strPathName] - file to check for
'
' Returns: True if file exists and is in use, False otherwise
'-----------------------------------------------------------
'
Public Function FileInUse(ByVal strPathName As String) As Boolean
    Dim hFile As Long
    
    On Error Resume Next
    '
    ' If the string is quoted, remove the quotes.
    '
    strPathName = strUnQuoteString(strPathName)
    '
    'Remove any trailing directory separator character
    '
    If Right$(strPathName, 1) = gstrSEP_DIR Then
        strPathName = Left$(strPathName, Len(strPathName) - 1)
    End If
 
    hFile = CreateFile(strPathName, GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL Or FILE_FLAG_WRITE_THROUGH, 0)
    
    If hFile = INVALID_HANDLE_VALUE Then
        FileInUse = Err.LastDllError = ERROR_SHARING_VIOLATION
    Else
        CloseHandle hFile
    End If
    Err.Clear
End Function

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by:cano63
ID: 24467417
Does this code is for vb6.0,  is not working, do i have to call any special lybrary.
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JohnBPrice earned 125 total points
ID: 24492386
>>do i have to call any special lybrary

Yes.  If you follow the link I posted, it is an article about how to use the  FileInUse function.  In that article, you would see that the code is from the vb setup project installed with visual studio 6.0.  Look for setup1.vbp in C:\Program Files\Microsoft Visual Studio\VB98\Wizards\PDWizard\Setup1 and you can copy what code you need.
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