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How to check if a file is in use?

Posted on 2009-06-30
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Last Modified: 2013-11-27
Hi.  I have a form in MS Access that writes strings to a text file.  This text file is actually a macro script for a different application.  So, with a click of a button, here's what the form does:
1. Creates the script using the "Print" command to put lines of text in a text file.
2. opens up the application.
3. Using Sendkeys, send the command to that application to run the macro script.
This all works, but here's my problem:  I also need the text file that is created to be deleted right away.  Problem with the execution is it won't because the file is in use at that point by the other application.  I had thought the solution would be to create a while loop to try and delete the file while the file exists.  This does not work.  I am thinking that if there is a way to check if the file was in use instead in the while loop would work, but i'm not sure.  Anybody know of a way for me to code it to delete the file once it is not in use anymore?  Don't want to use a timer because i want to make sure the file is deleted as soon as it can be deleted.
Private Sub Command10_Click()
If IsNull(Me.JDA) = True Then GoTo Fieldsempty
If IsNull(Me.sku) = True Then GoTo Fieldsempty
If IsNull(Me.qty) = True Then GoTo Fieldsempty
If IsNull(Me.customer) = True Then GoTo Fieldsempty
If IsNull(Me.warehouse) = True Then GoTo Fieldsempty
'Define all the variables that are going to be used
Dim strInputVal As String
Dim strOutputVal As String
Dim strChar As String
Dim strMocha As String
Dim fso As Object, fsoFile As Object
'Check to see if there already is a macro present
If FileExists("C:\mochasoft\mtn5250.8") = True Then
'Delete the previous jda macro
Set fso = CreateObject("Scripting.FileSystemObject")
  Set fsoFile = fso.GetFile("c:\mochasoft\mtn5250.8")
  fsoFile.Delete
   End If
 'Open the macro to write to
 Open "c:\mochasoft\mtn5250.8" For Output As #1
 'write the inital line to the jda macro file
Print #1, "# Script file for Mocha W32 TN5250"
olwritejda Me.jdauser
Print #1, "9 0 0 f 1"
olwritejda Me.jdapass
Print #1, "d 0 0 1c 1"
Print #1, "d 0 0 1c 1"
Print #1, "31 0 0 0 0"
Print #1, "38 0 0 0 0"
Print #1, "31 0 0 0 0"
Print #1, "d 0 0 1c 1"
olwritejda Me.JDA
Print #1, "71 0 0 3c 1"
Print #1, "71 0 0 3c 1"
olwritejda Me.sku
Print #1, "9 0 0 f 1"
Print #1, "27000 0 0 14d 1"
Print #1, "27000 0 0 14d 1"
Print #1, "27000 0 0 14d 1"
Print #1, "27000 0 0 14d 1"
Print #1, "27000 0 0 14d 1"
Print #1, "2e 0 0 153 1"
Print #1, "2e 0 0 153 1"
Print #1, "2e 0 0 153 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
olwritejda Me.qty
Print #1, "76 0 0 41 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
olwritejda Me.warehouse
Print #1, "28000 0 0 150 1"
Print #1, "39 0 0 0 0"
Print #1, "39 0 0 0 0"
Print #1, "39 0 0 0 0"
Print #1, "39 0 0 0 0"
Print #1, "39 0 0 0 0"
Print #1, "28000 0 0 150 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
olwritejda Me.customer
Print #1, "76 0 0 41 1"
Print #1, "76 0 0 41 1"
Print #1, "72 0 0 3d 1"
Print #1, "70 0 0 3b 1"
Print #1, "70 0 0 3b 1"
Print #1, "31 0 0 0 0"
Print #1, "33 0 0 0 0"
olwritejda Me.JDA
Print #1, "d 0 0 1c 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "28000 0 0 150 1"
Print #1, "26000 0 0 148 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "25000 0 0 14b 1"
Print #1, "36 0 0 0 0"
Print #1, "d 0 0 1c 1"
Print #1, "75 0 0 40 1"
Print #1, "63 0 0 0 0"
Print #1, "72 0 0 0 0"
Print #1, "65 0 0 0 0"
Print #1, "64 0 0 0 0"
Print #1, "69 0 0 0 0"
Print #1, "74 0 0 0 0"
Print #1, "20 0 0 0 0"
Print #1, "69 0 0 0 0"
Print #1, "73 0 0 0 0"
Print #1, "73 0 0 0 0"
Print #1, "75 0 0 0 0"
Print #1, "65 0 0 0 0"
Print #1, "64 0 0 0 0"
Print #1, "9 0 0 f 1"
Print #1, "9 0 0 f 1"
Print #1, "9 0 0 f 1"
Print #1, "53 0 0 0 0"
Print #1, "4b 0 0 0 0"
Print #1, "55 0 0 0 0"
Print #1, "3a 0 0 0 0"
'Print #1, "41 0 0 0 0"
'Print #1, "6d 0 0 0 0"
'Print #1, "6f 0 0 0 0"
'Print #1, "75 0 0 0 0"
'Print #1, "6e 0 0 0 0"
'Print #1, "74 0 0 0 0"
'Print #1, "3a 0 0 0 0"
olwritejda Me.sku
Print #1, "9 0 0 f 1"
Print #1, "52 0 0 0 0"
Print #1, "65 0 0 0 0"
Print #1, "61 0 0 0 0"
Print #1, "73 0 0 0 0"
Print #1, "6f 0 0 0 0"
Print #1, "6e 0 0 0 0"
Print #1, "3a 0 0 0 0"
olwritejda DLookup("[Field2]", "customer", "[Field1] = '" & Me.customer & "'")
Print #1, "70 0 0 3b 1"
Print #1, "70 0 0 3b 1"
Print #1, "70 0 0 3b 1"
Print #1, "70 0 0 3b 1"
Close #1
Shell "c:\Mochasoft\mtn5250.exe"
SendKeys "%8", True
Do While FileExists("C:\mochasoft\mtn5250.8") = True
fsoFile.Delete
Loop
'Me.JDA = Null
'Me.sku = Null
'Me.qty = Null
'Me.warehouse = Null
'Me.customer = Null
Exit Sub
Fieldsempty:
MsgBox "All fields are required."
Exit Sub
End Sub

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Question by:liebs
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Accepted Solution

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JohnBobH earned 500 total points
ID: 24750639
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by:Chuck Wood
ID: 24754354
Try this:
Public Function WaitForFile()
    '================================
    '  requires a reference to:
    '    Microsoft Scripting Runtime
    '================================
    Dim fso As New Scripting.FileSystemObject
    '
    ' ...
    '
    ' turn off error handling
    On Error Resume Next
    ' try to delete the file while it exists
    Do While fso.FileExists("C:\mochasoft\mtn5250.8")
        fso.DeleteFile "C:\mochasoft\mtn5250.8", True
    Loop
    ' turn error handling back on
    On Error GoTo 0
End Function

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