How can I display the current dir folder and file being scanned in treeview?

Question

1.00/5 (1 vote)

See more:

Ok once again I have made some improvments to the code but am stuck when trying to display the current folder/subfolder and file name to my lblmessage.text box. The root and folder that I wish to scan show in the text box when i select it in the treeview but how can I itterate to show what files are currently being scanned?

here is my code as it stands:

VB

Imports System.IO
Public Class form1
    Private Shared Sub FillOneLevel(ByVal root As TreeNode, ByVal path As String)
        Dim di As New DirectoryInfo(path)
        Try
             For Each subFolder As DirectoryInfo In di.GetDirectories()
                Dim node As New TreeNode(subFolder.Name) With {.Tag = subFolder.FullName}
                root.Nodes.Add(node)
            Next subFolder
        Catch ex As Exception
            ' do something
        End Try
    End Sub

    Private Sub form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim drives() As String = Environment.GetLogicalDrives()
        For Each dr As String In drives
            Dim node As New TreeNode(dr) With {.Tag = dr}
            FillOneLevel(node, dr)
            tv1.Nodes.Add(node)
        Next dr
        tv1.Nodes(0).Expand()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        LookAtDir(lblMessage.Text)
    End Sub
    Private Sub LookAtDir(ByVal path As String)
        Try
            For Each dir As String In Directory.GetDirectories(path)
                LookAtDir(dir)
            Next
            '...Do something with the directory.
        Catch ex As UnauthorizedAccessException
        End Try
    End Sub

    Private Sub tv1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles tv1.AfterSelect
        lblMessage.Text = tv1.SelectedNode.Tag
    End Sub
End Class

This code successfuly gathers folders recrusivly but once I click start Nothing new is displayed in the textbox..... This is when id like to see the current dir and folder to the next and so on that is being scanned.... does anyone know what i mean?

thank you in advance and have a nice day!! :)

Posted 2-Feb-11 20:34pm

Dale 2012

Updated 2-Feb-11 20:49pm

Sergey Alexandrovich Kryukov

v3

Add a Solution

Comments

JF2015 3-Feb-11 2:36am

Edited to add code formatting.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-02-02T21:07:00

This requires very accurate well-planned technique. Here I can only describe the schema.

1) You don't need to gather file system objects recursively. You need to do one level of directory depth at a time for each tree node representing a directory. In addition, for each sub-directory at a given level you should find out if it is currently empty or not.

2) At a given level of directory structure and tree structure, add a node per file system object. If a current node represent non-empty directory, for this node add exactly one child, representing fake object.

3) You should handle events TreeView.BeforeExpand and TreeView.AfterCollapse.

4) When you're about to expand a tree node representing a non-empty directory (all other node should not have any children), you should remove a fake child and repeat procedure from item (2) for this tree node and a level of directory structure. After expanding is done, the user will see newly obtained directory structure.

5) After you collapse a tree node, clean all its children and add a fake child node again.

Items (4-5) shows virtual behavior of the tree: you only have as many data items as number of currently expanded nodes. Remember, during your operation another process can add/remove files, so there is no sense to keep all data in the tree. Moreover, you may not have enough memory to keep all available files in your tree.

Very advanced feature would be using System.IO.FileSystemWatcher class to track all the changes in directory structure (in you view) which are done by all other processes and reflect relevant changes on you tree view.

Good luck,

—SA

OriginalGriff · Accepted Answer · 2011-02-02T21:07:00

Solution 2

See my answer to your previous posting of this question. How do I use a treeview to scan root directories folders and subfolders?[^]

If you want to see what directory / file is being handled in real time, then you have two choices:
1) Move the processing to a background thread.
2) Liberally scatter calls to Application.DoEvents through your code.

Otherwise, it is so busy scanning, then the UI does not get updated.

Posted 2-Feb-11 21:07pm

OriginalGriff

Comments

Sergey Alexandrovich Kryukov 3-Feb-11 3:13am

This is something to think a bit. Only I would say DoEvent is quite bad. Would you agree?
--SA

OriginalGriff 3-Feb-11 3:29am

Oh yes! I described it as "doing the nasty" and "suitable for testing only" in the previous answer!

Dale 2012 3-Feb-11 3:39am

How can i move processes to background threads?

Kschuler 3-Feb-11 12:07pm

Research the BackgroundWorker:
http://www.google.com/#hl=en&sugexp=ldymls&xhr=t&q=vb.net+backgroundworker&cp=9&pf=p&sclient=psy&aq=0&aqi=&aql=&oq=vb.net+ba&pbx=1&fp=a02c97597e71f11