Public Function GetRootItem( _
   ByVal item As Object _
) As Object

Dim instance As WiaSession
Dim item As Object
Dim value As Object
 
value = instance.GetRootItem(item)

public object GetRootItem( 
   object item
)

public:
Object^ GetRootItem( 
   Object^ item
) 

Dim wiaSession As WiaSession
Public Sub GetRootItemExample(ByVal parent As IWin32Window)
   If (Not WiaSession.IsAvailable(WiaVersion.Version1)) Then
      MessageBox.Show("WIA version 1.0 not installed.")
      Return
   End If

   wiaSession = New WiaSession()
   wiaSession.Startup(WiaVersion.Version1)

   Dim res As DialogResult = wiaSession.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault)
   If res <> DialogResult.OK Then
      MessageBox.Show("Error selecting WIA device.")
      wiaSession.Shutdown()
      Return
   End If

   Dim rootItem As Object = wiaSession.GetRootItem(Nothing)
   If Not rootItem Is Nothing Then
      AddHandler wiaSession.EnumItemsEvent, AddressOf session_EnumItemsEvent

      wiaSession.EnumChildItems(rootItem)

      RemoveHandler wiaSession.EnumItemsEvent, AddressOf session_EnumItemsEvent
   End If

   wiaSession.Shutdown()
End Sub

Private Sub session_EnumItemsEvent(ByVal sender As Object, ByVal e As WiaEnumItemsEventArgs)
   If Not e.Item Is Nothing Then
      Dim dataTransfer As WiaDataTransferProperties = WiaDataTransferProperties.Empty
      Dim imageEffects As WiaImageEffectsProperties = WiaImageEffectsProperties.Empty

      Dim properties As WiaProperties = wiaSession.GetProperties(e.Item)

      properties.MaximumNumberOfPages = 0 ' scan all pages in feeder
      dataTransfer.ImageDataType = WiaImageDataType.Grayscale
      imageEffects.Brightness = 250

      properties.DataTransfer = dataTransfer
      properties.ImageEffects = imageEffects

      AddHandler wiaSession.SetPropertiesEvent, AddressOf session_SetPropertiesEvent

      wiaSession.SetProperties(e.Item, properties)

      RemoveHandler wiaSession.SetPropertiesEvent, AddressOf session_SetPropertiesEvent

      wiaSession.FreeItem(e.Item)
   End If
End Sub

Private Sub session_SetPropertiesEvent(ByVal sender As Object, ByVal e As WiaSetPropertiesEventArgs)
   If e.Error <= 0 Then
      Console.WriteLine("Failed to set the below property:" & Constants.vbLf + Constants.vbTab & "Property Id: {0}" & Constants.vbLf + Constants.vbTab & "Property Value: {1}" & Constants.vbLf + Constants.vbTab & "Error: {2}" & Constants.vbLf + Constants.vbLf, e.PropertyId.ToString(), Convert.ToInt32(e.Value).ToString(), e.Error.ToString())
   End If
End Sub

WiaSession wiaSession;
public void GetRootItemExample(IWin32Window parent)
{
   if (!WiaSession.IsAvailable(WiaVersion.Version1))
   {
      MessageBox.Show("WIA version 1.0 not installed.");
      return;
   }

   wiaSession = new WiaSession();
   wiaSession.Startup(WiaVersion.Version1);

   DialogResult res = wiaSession.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault);
   if (res != DialogResult.OK)
   {
      MessageBox.Show("Error selecting WIA device.");
      wiaSession.Shutdown();
      return;
   }

   object rootItem = wiaSession.GetRootItem(null);
   if (rootItem != null)
   {
      wiaSession.EnumItemsEvent += new EventHandler<WiaEnumItemsEventArgs>(wiaSession_EnumItemsEvent);

      wiaSession.EnumChildItems(rootItem);

      wiaSession.EnumItemsEvent -= new EventHandler<WiaEnumItemsEventArgs>(wiaSession_EnumItemsEvent);
   }

   wiaSession.Shutdown();
}

void wiaSession_EnumItemsEvent(object sender, WiaEnumItemsEventArgs e)
{
   if(e.Item != null)
   {
      WiaDataTransferProperties dataTransfer = WiaDataTransferProperties.Empty;
      WiaImageEffectsProperties imageEffects = WiaImageEffectsProperties.Empty;

      WiaProperties properties = wiaSession.GetProperties(e.Item);

      properties.MaximumNumberOfPages = 0;   // scan all pages in feeder
      dataTransfer.ImageDataType = WiaImageDataType.Grayscale;
      imageEffects.Brightness = 250;

      properties.DataTransfer = dataTransfer;
      properties.ImageEffects = imageEffects;

      wiaSession.SetPropertiesEvent += new EventHandler<WiaSetPropertiesEventArgs>(wiaSession_SetPropertiesEvent);

      wiaSession.SetProperties(e.Item, properties);

      wiaSession.SetPropertiesEvent -= new EventHandler<WiaSetPropertiesEventArgs>(wiaSession_SetPropertiesEvent);

      wiaSession.FreeItem(e.Item);
   }
}

void wiaSession_SetPropertiesEvent(object sender, WiaSetPropertiesEventArgs e)
{
   if(e.Error <= 0)
   {
      Console.WriteLine("Failed to set the below property:\n\tProperty Id: {0}\n\tProperty Value: {1}\n\tError: {2}\n\n", e.PropertyId.ToString(), Convert.ToInt32(e.Value).ToString(), e.Error.ToString());
   }
}