How to extract icon from file
Example of code to extract all icons from a file using shell32
How could you extract all the icons from a DLL or a file using .NET? is simple if you use shell32.dll . Sometimes, the framework .NET can’t give you what you need, so you have to rely on older techniques.Here is a program where you could load a file and extract all the icons in two ImageList. The first is for small icons and the seconds for larger ones. All those icons will be injected in a ListView. This program is free and you could easily view all the icons from any files. Pretty cool!
''' <summary> ''' Author : Check-Kay Wong ''' ''' the Shared funtion Icon.ExtractAssociatedIcon from System.Drawing.Icon ''' only have one single argument, choosing the first icon from a file. ''' Because the basic extractIcon from Framework.NET don't have enought options, ''' you will need to import and use ExtractAssociatedIcon from Shell32.dll ''' </summary> ''' <remarks></remarks> Public Class Form1 ''' <summary> ''' this is one way to import a dll ''' </summary> ''' <param name="hinst"></param> ''' <param name="lpiconpath">ENGLISH : file path ; FRANCAIS : chemin d'accès au fichier</param> ''' <param name="lpiicon">ENGLISH : icon number or index ; FRANCAIS : numéro d'icône</param> ''' <returns>ENGLISH : return a handle ; FRANCAIS: retourne un pointeur</returns> ''' <remarks></remarks> <System.Runtime.InteropServices.DllImport("shell32.dll")> Shared Function _ ExtractAssociatedIcon(ByVal hinst As IntPtr, ByVal lpiconpath As String, _ ByRef lpiicon As Integer) As IntPtr End Function ''' <summary> ''' this is another way to import a dll ''' </summary> ''' <param name="lpiconpath">ENGLISH : file path ; FRANCAIS : chemin d'accès au fichier</param> ''' <param name="lpiicon">ENGLISH : icon number or index ; FRANCAIS : numéro d'icône</param> ''' <returns>ENGLISH : return a handle ; FRANCAIS: retourne un pointeur</returns> ''' <remarks></remarks> 'Private Declare Function ExtractAssociatedIcon(ByVal hinst As IntPtr, ByVal lpiconpath As String, _ ' ByRef lpiicon As Integer) As IntPtr Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load Me.TextBox1.Text = My.Application.Info.AssemblyName.ToString TextBox1.Text = Environment.GetFolderPath(Environment.SpecialFolder.System) & "\shell32.dll" End Sub Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click End Sub Private Sub Button1_MouseUp(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Button1.MouseUp '-------------------------------------------------------- ' this part only help getting a file name '-------------------------------------------------------- If Not IO.File.Exists(TextBox1.Text) Then Using oOpenFileDialog As New OpenFileDialog oOpenFileDialog.Multiselect = False If oOpenFileDialog.ShowDialog = Windows.Forms.DialogResult.OK Then TextBox1.Text = oOpenFileDialog.FileName End If End Using End If '-------------------------------------------------------- ' this part only help getting a file name '-------------------------------------------------------- Dim hIcon As IntPtr Dim sPath As String = TextBox1.Text Dim oIcon As Icon Dim index1 As Integer Try ListView1.Items.Clear() ImageList1.Images.Clear() ImageList2.Images.Clear() ListView1.SmallImageList = ImageList1 ListView1.LargeImageList = ImageList2 'i decided to load the first 300 icons. 'using the shell32.dll function and ' and not the one from the Framework .NET For index1 = 0 To 300 Step 1 hIcon = ExtractAssociatedIcon(Me.Handle, sPath, index1) oIcon = Icon.FromHandle(hIcon) ImageList1.Images.Add(oIcon) ImageList2.Images.Add(oIcon) ListView1.Items.Add(index1.ToString, index1) Next index1 Catch ex As Exception MsgBox(index1) End Try End Sub End Class |
Yes of course, the program could be improved if the user tries to open a file that doesn’t contain a lot of icons.
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You could download the project sample :
References:
my web site: Check Technologies official website
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