FileSystemWatcher show form on file create

Posted on 2006-04-02
Last Modified: 2010-04-23
Hey Experts,

I have been smashing my head into a wall the last week trying to figure this out. I am sure it will turn out being something simple.

First off, I am using VB.NET from VS 2005.

I am monitoring a directory for a specific file type, lets say they are txt files.
On creation I want to create an instance of form2.
set vars on it, then show it.

so I have the following which fires  when the watcher detects a change
Private Sub logchange(ByVal source As Object, ByVal e As _
        If e.ChangeType = IO.WatcherChangeTypes.Changed Then

            '  MsgBox("File " & e.FullPath & _
            '                        " has been modified" & vbCrLf)
        End If
        If e.ChangeType = IO.WatcherChangeTypes.Created Then

            ' MsgBox("File " & e.FullPath & _
            '                        " has been created" & vbCrLf)
            Dim myFrom as new Form2
            myForm.label1.text="SOME VALUE"

        End If
        If e.ChangeType = IO.WatcherChangeTypes.Deleted Then

            'MsgBox("File " & e.FullPath & _
            '                         " has been deleted" & vbCrLf)
        End If
    End Sub

This works great when I just use message boxes but when attempt to display the form, it appears then kinda locks in place creating a white backround.

I understand that the watcher is running on another thread, and understand the concept of invoke and delegates but I simply can not figure this out.
Question by:kevin1265
    LVL 10

    Assisted Solution

    I'm not sure if you copied-pasted directly from your code. You dimension 'myFrom' but are setting on 'myForm'
    Dim myFrom as new Form2


    You may try also - myForm.ShowDialog() - so then it'll be modal - like a message box.


    LVL 10

    Accepted Solution

    Try this

    I using CLR2.0 new feature (No multi form pop up)

    Form2.Text = "Create"

    Instead of

    Dim myform as new form2
    myform.Text = "Create"

    Public Class Form1

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

            With Me.FileSystemWatcher1
                .EnableRaisingEvents = True
                .Path = "C:\Temp"
                .Filter = "*.*"
            End With

        End Sub

        Private Sub FileSystemWatcher1_Changed(ByVal sender As System.Object, ByVal e As System.IO.FileSystemEventArgs) _
        Handles FileSystemWatcher1.Changed, FileSystemWatcher1.Created, FileSystemWatcher1.Deleted

            Select Case e.ChangeType
                Case IO.WatcherChangeTypes.Created
                    Form2.Text = "Create"
                Case IO.WatcherChangeTypes.Deleted
                    Form2.Text = "Delete"
                Case IO.WatcherChangeTypes.Renamed
                    Form2.Text = "Rename"
            End Select

        End Sub

    End Class

    Author Comment

    Eric you the man, you have no idea how much this helped.

    Bchoor thanks this works as well however it freezes my GUI.

    Thanks for the quick response.

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