EnumDevices Method

Visual Basic
C#
Objective-C
Java
C++

public void EnumDevices()

'Declaration
 
Public Sub EnumDevices()

'Usage
 
Dim instance As WiaSession
 
instance.EnumDevices()

public:
void EnumDevices();

This function will enumerate all available system WIA devices connected to the user's machine.

Information about each device found, like the device ID, device name and device description, can be retrieved by using the EnumDevicesEvent event. To do so, add this event when enumerating the available WIA devices. To cancel the enumeration process add this event and set the Cancel member of the WiaEnumDevicesEventArgs to true.

For more information, refer to Managing WIA Sources.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Wia

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

   Dim session As WiaSession = New WiaSession()
   session.Startup(WiaVersion.Version1)

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

   AddHandler session.EnumDevicesEvent, AddressOf session_EnumDevicesEvent

   Console.WriteLine("Available WIA Devices:" & Constants.vbLf)
   session.EnumDevices()

   RemoveHandler session.EnumDevicesEvent, AddressOf session_EnumDevicesEvent

   session.Shutdown()
End Sub

Private Sub session_EnumDevicesEvent(ByVal sender As Object, ByVal e As WiaEnumDevicesEventArgs)
   Dim strMsg As String = String.Empty

   ' print out some information about each device found into the console window.
   strMsg = String.Format(Constants.vbTab & "Device Name: {0}" & Constants.vbLf + Constants.vbTab & "Device Id: {1}" & Constants.vbLf + Constants.vbTab & "Device Description: {2}" & Constants.vbLf + Constants.vbLf, e.DeviceName, e.DeviceID, e.DeviceDesc)
   Console.WriteLine(strMsg)
End Sub

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Wia;

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

   WiaSession 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;
   }

   wiaSession.EnumDevicesEvent += new EventHandler<WiaEnumDevicesEventArgs>(wiaSession_EnumDevicesEvent);

   Console.WriteLine("Available WIA Devices:\n");
   wiaSession.EnumDevices();

   wiaSession.EnumDevicesEvent -= new EventHandler<WiaEnumDevicesEventArgs>(wiaSession_EnumDevicesEvent);

   wiaSession.Shutdown();
}

void wiaSession_EnumDevicesEvent(object sender, WiaEnumDevicesEventArgs e)
{
   string strMsg = string.Empty;

   // print out some information about each device found into the console window.
   strMsg = string.Format("\tDevice Name: {0}\n\tDevice Id: {1}\n\tDevice Description: {2}\n\n", e.DeviceName, e.DeviceID, e.DeviceDesc);
   Console.WriteLine(strMsg);
}

Target Platforms

Reference

WiaSession Class
WiaSession Members
Startup Method
Shutdown Method
GetRootItem Method
GetProperties Method
SetProperties Method
Acquire Method
AcquireToFile Method
AcquireSimple Method