Question Image files list in listview

[mk aidu]

i have code for filling a listbox with files with a specified extension(in this case, jpg files)

Imports System
Imports System.IO

Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Try
'Get jpg files
Dim dirs As String() = Directory.GetFiles("c:\dave\", "*.jpg")
Dim dir As String
'Add file paths and filenames to the listbox
For Each dir In dirs ListBox1.Items.Add(dir)
Next
Catch ex As Exception
End Try
End Sub
--------------------------------------------
i'm thinking there's a way to do a similar thing using the listview.

i want to load image files into the listview. first column contains the filename, the next should contain the extension,the next the image size(pixels) and the last column should contain file size. pls help.

 

[jmcilhinney]

It will be similar but, inside your loop, you'll have to do a bit more work. First, rather than using Directory.GetFiles, I would suggest creating a DirectoryInfo and using DirectoryInfo.GetFiles. That will return an array of FileInfo objects instead of just Strings, so you can get the file size from them too. As for the image size, there may be some unmanaged function you can use but the only managed method that I'm aware of is to create an Image object and get the dimensions from that.

As for adding the items to the ListView, the MSDN documentation for the ListView class has a code example. Reading the relevant documentation should always be the first thing you do. The documentation for the type or member you're using is always relevant.

 

[mk aidu]

how to load selected filenames into listview?

I got an openfiledialog to open image files(filter property of the openfile dialog). But i don't know how to load the selected files into the listview. In the listview,
I got 4 columns(for Name, Extension,Image Size,File Size).


Imports System.IO
Public Class Form1
Private Sub AddImageFilesToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddImageFilesToolStripMenuItem.Click

Try
OpenFileDialog1.Title = "Load Files"
OpenFileDialog1.Filter = "JPG Files|*.jpg|GIF Files|*.gif|BITMAP Files|*.bmp|All Files|*.*"
OpenFileDialog1.FilterIndex = 1 OpenFileDialog1.ShowDialog()

Dim files() As String = System.IO.Directory.GetFiles(OpenFileDialog1.FileName)

For Each f As String In files
Dim info As New System.IO.FileInfo(f)
Dim str(3) As String

str(0) = IO.Path.GetFileNameWithoutExtension(f)
str(1) = System.IO.Path.GetExtension(f)
str(3) = CStr(info.Length) & " Kb"

Using img As Image = Image.FromFile(f)

str(2) = img.Size.Width & " x " & img.Size.Height & " px"
img.Dispose()

End Using str(3) = CStr(info.Length) & " Kb"

Dim item As New ListViewItem(str)
vFiles.Items.Add(item)
Next
Catch ex As Exception
End Try
End Sub
End Class

I think there's something wrong with this line in the above code
Dim files() As String = System.IO.Directory.GetFiles(OpenFileDialog1.FileName)

 

[Joshdbr]

Try changing this line:

Dim files() As String = System.IO.Directory.GetFiles(OpenFileDialog1.FileName)

To:

Dim files() As String = OpenFileDialog1.FileNames

Hope this help!
-Josh

 

[jmcilhinney]

Either you want the user to select files or you want them to select a folder and then you'll get all the files from it. If it's the former then you've already got the file names, as Joshdbr has shown. If it's the latter then you should be using a FolderBrowserDialog rather than an OpenFileDialog, so the user can select a folder.