EnumDevices Method

Summary

Enumerates all available system WIA devices connected to the user's machine.

Syntax
C#
VB
C++
public void EnumDevices() 
  
Public Sub EnumDevices()  
public: 
void EnumDevices();  

Remarks

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.

Example
C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Wia; 
 
public void EnumDevicesExample(IntPtr 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); 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Wia 
 
<TestMethod()> _ 
Public Sub EnumDevicesExample(ByVal parent As IntPtr) 
   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 

Requirements

Target Platforms

Help Version 20.0.2019.9.19
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