Enumerate WIA Devices

Take the following steps to create and run a program that enumerates the available WIA devices on your machine.

Start Visual Studio .NET.
Choose File->New->Project… from the menu.
In the New Project dialog box, choose either "Visual C# Projects" or "Visual Basic Projects" in the Projects Type List, and choose "Windows Application " in the Templates List.
Type the project name as "Enumerate WIA Devices" in the Project Name field, and then choose OK. If desired, type a new location for your project or select a directory using the Browse button, and then choose OK.
In the "Solution Explorer" window, right-click on the "References" folder, and select "Add Reference…" from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and browse to the "\LEAD Technologies\LEADTOOLS 17\Bin\DotNet\Win32 " folder and select the following DLLs:
- Leadtools.Wia.dll
Click the Select button and then press the OK button to add the above DLL to the application.

Go to the toolbox (View->Toolbox) and Drag and drop 1 instance of Button control to the top of the form and set the following properties for them:

Text	Name
Enumerate WIA Devices	btnEnumWiaDevices

Switch to Form1 code view (right-click Form1 in the solution explorer then select View Code ) and add the following lines at the beginning of the file:
[Visual Basic]
```
            Imports Leadtools.Wia
            
```
[C#]
```
            using Leadtools.Wia;
            
```

Declare the following private variable:

[Visual Basic]

            Private WithEvents session As WiaSession

[C#]

            private WiaSession session;

Add an event handler to the Form1 Load event and code it as follows:

[Visual Basic]

            Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
               Try
                  session = new WiaSession
                  session.Startup(WiaVersion.Version1)
               Catch ex As Exception
                  MessageBox.Show(ex.Message)
               End Try
            End Sub

[C#]

            private void Form1_Load(object sender, System.EventArgs e)
            {
               try
               {
                  session = new WiaSession();
                  session.Startup(WiaVersion.Version1);
               }
               catch (Exception ex)
               {
                  MessageBox.Show(this, ex.Message);
               }
            }

Add an event handler to the Form1 Closing event and code it as follows:

[Visual Basic]

            Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
               Try
                  session.Shutdown()
               Catch ex As Exception
                  MessageBox.Show(ex.Message)
               End Try
            End Sub

[C#]

            private void Form1_FormClosing(object sender, FormClosingEventArgs e)
            {
               try
               {
                  session.Shutdown();
               }
               catch (Exception ex)
               {
                  MessageBox.Show(this, ex.Message);
               }
            }

Add an event handler to the session EnumDevicesEvent event and code it as follows:

[Visual Basic]

            Private Sub session_EnumDevicesEvent(ByVal sender As Object, ByVal e As WiaEnumDevicesEventArgs) Handles session.EnumDevicesEvent
              Dim strMsg As String = String.Format("Device ID: {0}{1}Device Name: {2}{1}Device Description: {3}", e.DeviceID, Constants.vbLf, e.DeviceName, Constants.vbLf, e.DeviceDesc)
              MessageBox.Show(strMsg, "Available WIA Devices")
            End Sub

[C#]

            private void session_EnumDevicesEvent(object sender, WiaEnumDevicesEventArgs e)
            {
              string strMsg = string.Format("Device ID: {0}\nDevice Name: {2}\nDevice Description: {3}", e.DeviceID, e.DeviceName, e.DeviceDesc);
              MessageBox.Show(strMsg, "Available WIA Devices");
            }

Add an event handler to the btnEnumWiaDevices Click event and code it as follows:

[Visual Basic]

            Private Sub btnEnumWiaDevices_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEnumWiaDevices.Click
               Try
                  session.EnumDevices()
               Catch ex As Exception
                  MessageBox.Show(ex.Message)
               End Try
            End Sub

[C#]

            private void btnEnumWiaDevices_Click(object sender, System.EventArgs e)
            {
               try
               {
                  session.EnumDevicesEvent += new EventHandler<WiaEnumDevicesEventArgs>(session_EnumDevicesEvent);
                  session.EnumDevices();
               }
               catch (Exception ex)
               {
                  MessageBox.Show(this, ex.Message);
               }
            }

Build, and Run the program to test it.

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Enumerate WIA Devices