VintaSoft Twain .NET SDK 14.1: Руководство для .NET разработчика
Vintasoft.WinTwain Namespace / TwainBarcodeRecognizer Class
Члены типа Объект Синтаксис Example Иерархия Требования Смотрите также
В этом разделе
    Класс TwainBarcodeRecognizer
    В этом разделе
    Класс, который позволяет включить распознавание штрих-кодов в отсканированных изображениях и получить информацию о распознанных штрих-кодах.
    Объектная модель
    TwainBarcodeRecognizer
    Синтаксис
    'Declaration
    
    Public Class TwainBarcodeRecognizer
    
    
    public class TwainBarcodeRecognizer
    
    
    public __gc class TwainBarcodeRecognizer
    
    
    public ref class TwainBarcodeRecognizer
    
    
    Пример

    Вот C#/VB.NET код, который демонстрирует, как получить информацию о штрих-кодах, распознанных на полученном изображении.

    
    ''' <summary>
    ''' Synchronously acquires images from TWAIN device and retrieves from TWAIN device information about barcodes recognized on acquired images.
    ''' </summary>
    Public Sub SynchronouslyAcquireImageFromTwainDeviceAndRecognizeBarcodeInAcquiredImages()
        Using deviceManager As New Vintasoft.Twain.DeviceManager()
            Try
                ' open the device manager
                deviceManager.Open()
    
                deviceManager.ShowDefaultDeviceSelectionDialog()
    
                ' get reference to the default device
                Dim device As Vintasoft.Twain.Device = deviceManager.DefaultDevice
    
                ' specify that device UI must not be used
                device.ShowUI = False
                ' specify that device must be closed after scan
                device.DisableAfterAcquire = True
    
                ' open the device
                device.Open()
    
                ' specify that device should recognize barcodes in acquired images
                device.BarcodeRecognizer.IsEnabled = True
    
                ' acquire images from device
                Dim acquireModalState As Vintasoft.Twain.AcquireModalState = Vintasoft.Twain.AcquireModalState.None
                Do
                    acquireModalState = device.AcquireModal()
    
                    Select Case acquireModalState
                        Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                            ' get information about recognized barcodes
                            Dim recognizedBarcodes As Vintasoft.Twain.TwainBarcodeInfo() = device.BarcodeRecognizer.GetRecognitionResult()
                            ' if barcodes are NOT found
                            If recognizedBarcodes.Length = 0 Then
                                System.Console.WriteLine("Barcodes are NOT found.")
                            Else
                                ' if barcodes are found
                                System.Console.WriteLine(String.Format("{0} barcodes are found.", recognizedBarcodes.Length))
                                ' for each recognized barcode
                                For i As Integer = 0 To recognizedBarcodes.Length - 1
                                    ' output barcode type
                                    System.Console.Write(String.Format("BarcodeType={0} ", recognizedBarcodes(i).Type))
                                    ' output barcode text
                                    System.Console.WriteLine(String.Format("BarcodeText='{0}'", recognizedBarcodes(i).Value))
                                Next
                            End If
    
                            ' if acquired image is present (Native or Memory transfer mode is used)
                            If device.AcquiredImage IsNot Nothing Then
                                ' dispose the acquired image
                                device.AcquiredImage.Dispose()
                            End If
    
                            Exit Select
                    End Select
                Loop While acquireModalState <> Vintasoft.Twain.AcquireModalState.None
    
                ' close the device
                device.Close()
    
                ' close the device manager
                deviceManager.Close()
            Catch ex As Vintasoft.Twain.TwainException
                System.Console.WriteLine("Error: " + ex.Message)
                System.Console.ReadLine()
            End Try
        End Using
    End Sub
    
    
    
    /// <summary>
    /// Synchronously acquires images from TWAIN device and retrieves from TWAIN device information about barcodes recognized on acquired images.
    /// </summary>
    public void SynchronouslyAcquireImageFromTwainDeviceAndRecognizeBarcodeInAcquiredImages()
    {
        using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
        {
            try
            {
                // open the device manager
                deviceManager.Open();
    
                deviceManager.ShowDefaultDeviceSelectionDialog();
    
                // get reference to the default device
                Vintasoft.Twain.Device device = deviceManager.DefaultDevice;
    
                // specify that device UI must not be used
                device.ShowUI = false;
                // specify that device must be closed after scan
                device.DisableAfterAcquire = true;
    
                // open the device
                device.Open();
    
                // specify that device should recognize barcodes in acquired images
                device.BarcodeRecognizer.IsEnabled = true;
    
                // acquire images from device
                Vintasoft.Twain.AcquireModalState acquireModalState = Vintasoft.Twain.AcquireModalState.None;
                do
                {
                    acquireModalState = device.AcquireModal();
    
                    switch (acquireModalState)
                    {
                        case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                            // get information about recognized barcodes
                            Vintasoft.Twain.TwainBarcodeInfo[] recognizedBarcodes = device.BarcodeRecognizer.GetRecognitionResult();
                            // if barcodes are NOT found
                            if (recognizedBarcodes.Length == 0)
                            {
                                System.Console.WriteLine("Barcodes are NOT found.");
                            }
                            // if barcodes are found
                            else
                            {
                                System.Console.WriteLine(string.Format("{0} barcodes are found.", recognizedBarcodes.Length));
                                // for each recognized barcode
                                for (int i = 0; i < recognizedBarcodes.Length; i++)
                                {
                                    // output barcode type
                                    System.Console.Write(string.Format("BarcodeType={0} ", recognizedBarcodes[i].Type));
                                    // output barcode text
                                    System.Console.WriteLine(string.Format("BarcodeText='{0}'", recognizedBarcodes[i].Value));
                                }
                            }
    
                            // if acquired image is present (Native or Memory transfer mode is used)
                            if (device.AcquiredImage != null)
                                // dispose the acquired image
                                device.AcquiredImage.Dispose();
    
                            break;
                    }
                }
                while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);
    
                // close the device
                device.Close();
    
                // close the device manager
                deviceManager.Close();
            }
            catch (Vintasoft.Twain.TwainException ex)
            {
                System.Console.WriteLine("Error: " + ex.Message);
                System.Console.ReadLine();
            }
        }
    }
    
    

    Иерархия наследования

    System.Object
       Vintasoft.WinTwain.TwainBarcodeRecognizer

    Требования

    Целевые платформы: .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

    Смотрите также