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VB Coding Suggestion - Reading files in a directory

Posted on 2006-07-07
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Last Modified: 2010-07-27
I am just getting started with visual basic and was wondering if someone can show me an example or the basic commands necessary to read in files from a specified directory.  For example, the user would input the file path containing all the files to be searched.   The program would just read in each file from the specified directory.  Sounds simple.  

Input:
Search Path:  C:\Myfiles\Mytextfiles

Output:

 File Name: file1.txt
                 file2.pdf
                 file3.jpeg
                 file4.tiff
                 file5.txt

thanks
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Question by:Hojoformo
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2 Comments
 
LVL 8

Accepted Solution

by:
Shakti109 earned 500 total points
ID: 17063334

To just "list" the files in a directory you could use something like :

Add a textbox to a windows form, then add a button.

In the button.click event of the button add the following code :

      Dim fileEntries() As String = System.IO.Directory.GetFiles(TextBox1.Text)
      Dim filename As String
      For Each filename In fileEntries
         Console.WriteLine(filename)
      Next

This will output each filename from the specified directory to the console window.

You could do something like add the filenames to a listbox on the form.

That would look like :

      Dim fileEntries() As String = System.IO.Directory.GetFiles(TextBox1.Text)
      Dim filename As String
      For Each filename In fileEntries
         listbox1.items.add(filename)
      Next


If you use the object browser inside of the IDE, you can look at the .GetFiles method (it has two variants, one accepts a pattern filter). This should point you in the right direction to start learning about File IO.
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LVL 12

Expert Comment

by:Praveen Kumar
ID: 17065188
Even nice comment from Shakti, Here is a recursive function to Navigate all files in a Directory and its Sub Directories..

Private Sub ShowAllFiles(ByVal dir as String)

Try
      For Each fname as String in Directory.GetFiles(dir)
                 listbox1.items.add(filename)
      Next

      For Each subdir as String in Directory.GetDirectories(dir)
                 ShowAllFiles(subdir)
      Next
Catch
   'May be Drive not ready
End Try
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