Hi again,
Im using vb 2005
Im using this code to watch a folder and log any changes etc... -
Imports System.IO
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Imports System.Diagnostics
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Public Class Form1
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Public watchfolder As FileSystemWatcher
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Private Sub btn_startwatch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_startwatch.Click
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watchfolder = New System.IO.FileSystemWatcher()
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'this is the path we want to monitor
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watchfolder.Path = txt_watchpath.Text
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'Add a list of Filter we want to specify
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'make sure you use OR for each Filter as we need to
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'all of those
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watchfolder.NotifyFilter = IO.NotifyFilters.DirectoryName
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watchfolder.NotifyFilter = watchfolder.NotifyFilter Or _
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IO.NotifyFilters.FileName
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watchfolder.NotifyFilter = watchfolder.NotifyFilter Or _
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IO.NotifyFilters.Attributes
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' add the handler to each event
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AddHandler watchfolder.Changed, AddressOf logchange
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AddHandler watchfolder.Created, AddressOf logchange
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AddHandler watchfolder.Deleted, AddressOf logchange
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' add the rename handler as the signature is different
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AddHandler watchfolder.Renamed, AddressOf logrename
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'Set this property to true to start watching
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watchfolder.EnableRaisingEvents = True
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btn_startwatch.Enabled = False
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btn_stop.Enabled = True
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'End of code for btn_start_click
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End Sub
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Private Sub logchange(ByVal source As Object, ByVal e As _
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System.IO.FileSystemEventArgs)
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If e.ChangeType = IO.WatcherChangeTypes.Changed Then
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txt_folderactivity.Text &= "File " & e.FullPath & _
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" has been modified" & vbCrLf
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End If
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If e.ChangeType = IO.WatcherChangeTypes.Created Then
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txt_folderactivity.Text &= "File " & e.FullPath & _
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" has been created" & vbCrLf
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End If
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If e.ChangeType = IO.WatcherChangeTypes.Deleted Then
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txt_folderactivity.Text &= "File " & e.FullPath & _
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" has been deleted" & vbCrLf
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End If
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End Sub
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Public Sub logrename(ByVal source As Object, ByVal e As _
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System.IO.RenamedEventArgs)
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txt_folderactivity.Text &= "File" & e.OldName & _
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" has been renamed to " & e.Name & vbCrLf
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End Sub
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Private Sub btn_stop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_stop.Click
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' Stop watching the folder
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watchfolder.EnableRaisingEvents = False
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btn_startwatch.Enabled = True
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btn_stop.Enabled = False
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End Sub
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End Class
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I get this error: on line: 47 -
Cross-thread operation not valid: Control 'txt_folderactivity' accessed from a thread other than the thread it was created on.
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Can anyone suggest anything, or tell me what this error means?
James
3  1439 
The FileSystemWatcher runs on a seperate thread, when you try to set the value of your TextBox .NET doesn't allow you to access the control from another thread, and will throw the exception you just specified.
What you need to do is call back to the main thread that your UI is running on. Here is an example on how you can accomplish this. -
Private Delegate Sub FileWatcherCallback(ByVal e As FileSystemEventArgs)
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Private Sub logchange(ByVal source As Object, ByVal e As FileSystemEventArgs)
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If txt_folderactivity.InvokeRequired Then
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txt_folderactivity.Invoke(New FileWatcherCallback(AddressOf HandleFileWatcherEvent), e)
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End If
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End Sub
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Private Sub HandleFileWatcherEvent(ByVal e As FileSystemEventArgs)
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txt_folderactivity.Text &= "File " & e.FullPath & " has been modified" & vbCrLf
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End Sub
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Hope this helps.
Thanks for the reply!
I'm affraid i don't understand, it's a little to complicated for me... Dont think I've done anything like this before.
so instead i did this: -
System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false
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It made the problem go away.
James
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