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New file "event"

Posted on 1998-12-06
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Last Modified: 2010-05-03
I want to get an "event" then a new file/update to file occurs in a directory. How can I do this?
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Question by:manne
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dm_14 earned 300 total points
ID: 1448433
1. Use the FindNextChangeNotification and FindFirstChangeNotification
2. You can find the declarations and constants in the VB5 text viewer
3. More info available on Microsofts MSDN site
4. Here is a sample piece of code:

Private Sub Command1_Click()
Do
    Dim lDir As Long, lFound1 As Long, lFound2 As Long
    sPath = Left$(sSourceDir, Len(sSourceDir) - 1)
    lDir = FindFirstChangeNotification(sPath, False, FILE_NOTIFY_FLAGS)
    Do
      lFound1 = WaitForSingleObject(lDir, 100)
      DoEvents: If bFlag = True Then Exit Do
    Loop While lFound1 <> 0
    Do
     lFound2 = FindNextChangeNotification(lDir)
     Do
      lFound2 = WaitForSingleObject(lDir, 100)
      DoEvents
      If bFlag = True Then Exit Do
     Loop While lFound2 <> 0
     If bFlag = True Then Exit Do
     If iFound2 = 0 Then
         DoEvents
         ' -- ** Place your event code here ** --
         MsgBox "The watched directory has been changed.  Resuming watch..."
     End If
   Loop
end sub
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Expert Comment

by:dm_14
ID: 1448434
Correction ..
2. You can find the declarations and constants in the VB5  API text viewer
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Expert Comment

by:dm_14
ID: 1448435
Sorry .. The code I sent has a few errors
Here is a better example :

1. Here are the declarations you need :
(Some of the constants allow you to detect different changes to a file)

Public Const INFINITE = &HFFFF
Public Const FILE_NOTIFY_CHANGE_FILE_NAME As Long = &H1
Public Const FILE_NOTIFY_CHANGE_DIR_NAME As Long = &H2
Public Const FILE_NOTIFY_CHANGE_ATTRIBUTES As Long = &H4
Public Const FILE_NOTIFY_CHANGE_SIZE As Long = &H8
Public Const FILE_NOTIFY_CHANGE_LAST_WRITE As Long = &H10
Public Const FILE_NOTIFY_CHANGE_LAST_ACCESS As Long = &H20
Public Const FILE_NOTIFY_CHANGE_CREATION As Long = &H40
Public Const FILE_NOTIFY_CHANGE_SECURITY As Long = &H100
Public Const FILE_NOTIFY_FLAGS = FILE_NOTIFY_CHANGE_ATTRIBUTES Or _
                                 FILE_NOTIFY_CHANGE_FILE_NAME Or _
                                 FILE_NOTIFY_CHANGE_LAST_WRITE

Public Declare Function FindFirstChangeNotification Lib "kernel32" _
    Alias "FindFirstChangeNotificationA" _
   (ByVal lpPathName As String, _
    ByVal bWatchSubtree As Long, _
    ByVal dwNotifyFilter As Long) As Long

Public Declare Function FindCloseChangeNotification Lib "kernel32" _
   (ByVal hChangeHandle As Long) As Long

Public Declare Function FindNextChangeNotification Lib "kernel32" _
   (ByVal hChangeHandle As Long) As Long

Public Declare Function WaitForSingleObject Lib "kernel32" _
   (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long

Public Const WAIT_OBJECT_0 = &H0
Public Const WAIT_ABANDONED = &H80
Public Const WAIT_IO_COMPLETION = &HC0
Public Const WAIT_TIMEOUT = &H102
Public Const STATUS_PENDING = &H103


2. Here is the code to place in a command button :

Private Sub Command1_Click()
Do
    Dim lDir As Long, lFound1 As Long, lFound2 As Long, sPath As String
    sPath = "c:\temp1" ' *** directory to watch ***
    lDir = FindFirstChangeNotification(sPath, False, FILE_NOTIFY_FLAGS)
    Do
      lFound1 = WaitForSingleObject(lDir, 100)
      DoEvents: If bFlag = True Then Exit Do
    Loop While lFound1 <> 0
    Do
     lFound2 = FindNextChangeNotification(lDir)
     Do
      lFound2 = WaitForSingleObject(lDir, 100)
      DoEvents
      If bFlag = True Then Exit Do
     Loop While lFound2 <> 0
     If bFlag = True Then Exit Do
     If iFound2 = 0 Then
        MsgBox sPath
        MsgBox "The watched directory has been changed.  Resuming watch..."
     End If
   Loop
   lFound2 = FindCloseChangeNotification(lDir)
   
Loop
End Sub

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