Solved

New file "event"

Posted on 1998-12-06
3
165 Views
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?
0
Comment
Question by:manne
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
3 Comments
 
LVL 2

Accepted Solution

by:
dm_14 earned 100 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
0
 
LVL 2

Expert Comment

by:dm_14
ID: 1448434
Correction ..
2. You can find the declarations and constants in the VB5  API text viewer
0
 
LVL 2

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

0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I’ve seen a number of people looking for examples of how to access web services from VB6.  I’ve been using a test harness I built in VB6 (using many resources I found online) that I use for small projects to work out how to communicate with web serv…
Article by: Martin
Here are a few simple, working, games that you can use as-is or as the basis for your own games. Tic-Tac-Toe This is one of the simplest of all games.   The game allows for a choice of who goes first and keeps track of the number of wins for…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question