VintaSoft Twain .NET SDK 12.1
Vintasoft.Twain Namespace / DeviceManager Class
Members Example




In This Topic
    DeviceManager Class
    In This Topic
    Class that allows to manipulate TWAIN device manager.
    Object Model
    DeviceManager ClassDevice ClassDeviceCollection ClassDevice ClassDevice Class
    Syntax
    'Declaration
     
    <ToolboxBitmapAttribute(Vintasoft.Twain.DeviceManager, "DeviceManager.icon.bmp")>
    <DesignerCategoryAttribute("Component")>
    Public NotInheritable Class DeviceManager 
       Inherits System.ComponentModel.Component
    'Usage
     
    Dim instance As DeviceManager
    [ToolboxBitmap(Vintasoft.Twain.DeviceManager, "DeviceManager.icon.bmp")]
    [DesignerCategory("Component")]
    public sealed class DeviceManager : System.ComponentModel.Component 
    [ToolboxBitmap(Vintasoft.Twain.DeviceManager, "DeviceManager.icon.bmp")]
    [DesignerCategory("Component")]
    public __gc __sealed class DeviceManager : public System.ComponentModel.Component 
    [ToolboxBitmap(Vintasoft.Twain.DeviceManager, "DeviceManager.icon.bmp")]
    [DesignerCategory("Component")]
    public ref class DeviceManager sealed : public System.ComponentModel.Component 
    Remarks
    Class allows to:
    • determine that TWAIN is installed in the system
    • choose which TWAIN device manager to use (1.x or 2.x)
    • specify path to TWAIN device manager
    • get number of TWAIN devices installed in the system
    • select the device
    • get access to object that manipulates TWAIN device
    Example
    This example shows how to select the device and acquire images from the device.
    ''' <summary>
    ''' Starts the asynchronous image acquisition from scanner.
    ''' </summary>
    Private Sub StartScan(ByVal deviceManager As Vintasoft.Twain.DeviceManager)
        ' specify TWAIN name of this application
        deviceManager.ApplicationProductName = "MyTwainApplication"
        Try
            ' open the device manager
            deviceManager.Open()
                
            ' show the default device selection dialog
            If Not deviceManager.ShowDefaultDeviceSelectionDialog() Then
                ' exit if default device is not selected
                Return
            End If
                
            ' get reference to the default device
            Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice
            ' acquire image(s) from the device
            device.Acquire()
        Catch ex As Vintasoft.Twain.TwainException
            Console.WriteLine(ex.Message)
        End Try
    End Sub
    /// <summary>
    /// Starts the asynchronous image acquisition from scanner.
    /// </summary>
    void StartScan(Vintasoft.Twain.DeviceManager deviceManager)
    {
        // specify TWAIN name of this application
        deviceManager.ApplicationProductName = "MyTwainApplication";
        try
        {
            // open the device manager
            deviceManager.Open();
                
            // show the default device selection dialog
            if (!deviceManager.ShowDefaultDeviceSelectionDialog())
                // exit if default device is not selected
                return;
                
            // get reference to the default device
            Vintasoft.Twain.Device device = deviceManager.DefaultDevice;
            // acquire image(s) from the device
            device.Acquire();
        }
        catch (Vintasoft.Twain.TwainException ex)
        {
            System.Console.WriteLine(ex.Message);
        }
    }
    Inheritance Hierarchy

    System.Object
       System.MarshalByRefObject
          System.ComponentModel.Component
             Vintasoft.Twain.DeviceManager

    Requirements

    Target Platforms: .NET 6; .NET 5; .NET Core 3.1; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

    See Also