VintaSoft Twain .NET SDK 14.1: Руководство для .NET разработчика
Vintasoft.Twain Namespace / Device Class / StopFeeder() Method
Синтаксис Exceptions Example Требования Смотрите также
В этом разделе
    StopFeeder() Метод (Device)
    В этом разделе
    Отправляет на устройство команду остановки устройства подачи документов (податчик документов не будет остановлен сразу после выполнения этого метода).
    Синтаксис
    'Declaration
    
    Public Sub StopFeeder()
    
    
    public void StopFeeder()
    
    
    public: void StopFeeder()
    
    
    public:
    void StopFeeder()
    Исключения
    ИсключениеОписание
    Выбрасывается, если используется .NET отладчик и для оценки функции требуется, чтобы все потоки выполнялись.
    Выбрасывается, если устройство не передает изображения ИЛИ устройство не поддерживает функцию автоматического сканирования.
    Пример

    Это C#/VB. NET-код показывает, как приостановить получение изображения из устройства подачи (остановить устройство подачи) и возобновить получение изображения из устройства подачи.

    
    Class SyncScan_StopFeeder
    
        ''' <summary>
        ''' This method scans the first image, stops the document feeder,
        ''' scans the second image.
        ''' </summary>
        Public Shared Sub ScanImage_StopFeeder_ScanImage()
            Dim imageCount As Integer = 0
    
            ' create the device manager
            Using deviceManager As New Vintasoft.Twain.DeviceManager()
                deviceManager.IsTwain2Compatible = True
                ' open the device manager
                deviceManager.Open()
    
                ' get the device
                Dim deviceName As String = "KODAK Scanner: i5000"
                Dim device As Vintasoft.Twain.Device = deviceManager.Devices.Find(deviceName)
                If device Is Nothing Then
                    Throw New ApplicationException(String.Format("Device '{0}' is not found.", deviceName))
                End If
    
                ' disable device UI
                device.ShowUI = False
                ' specify that device must be closed after scan
                device.DisableAfterAcquire = True
    
                ' open the device
                device.Open()
                ' specify that 2 images must be acquired from scanner
                device.XferCount = 2
    
                ' run synchronous image acquisition
                Dim acquireModalState1 As Vintasoft.Twain.AcquireModalState = Vintasoft.Twain.AcquireModalState.None
                Do
                    acquireModalState1 = device.AcquireModal()
                    Select Case acquireModalState1
                        Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                            Console.WriteLine("Image is acquired.")
                            If device.AcquiredImage IsNot Nothing Then
                                device.AcquiredImage.Dispose()
                            End If
    
                            imageCount += 1
    
                            ' stop the feeder
                            device.StopFeeder()
                            Exit Select
    
                        Case Vintasoft.Twain.AcquireModalState.ScanCompleted
                            Console.WriteLine("Scan is completed.")
                            Exit Select
    
                        Case Vintasoft.Twain.AcquireModalState.ScanCanceled
                            Console.WriteLine("Scan is canceled.")
                            Exit Select
    
                        Case Vintasoft.Twain.AcquireModalState.ScanFailed
                            Console.WriteLine(String.Format("Scan is failed: {0}.", device.ErrorString))
                            Exit Select
                    End Select
                Loop While acquireModalState1 <> Vintasoft.Twain.AcquireModalState.None
    
                If imageCount <> 1 Then
                    Throw New ApplicationException("Wrong acquired image count.")
                End If
    
                If device.State <> Vintasoft.Twain.DeviceState.TransferReady Then
                    Throw New ApplicationException("Feeder is NOT stopped.")
                End If
                Console.WriteLine("Feeder is stopped.")
    
                ' continue asynchronous image acquisition
                Do
                    acquireModalState1 = device.AcquireModal()
                    Select Case acquireModalState1
                        Case Vintasoft.Twain.AcquireModalState.ImageAcquired
                            Console.WriteLine("Image is acquired.")
    
                            If device.AcquiredImage IsNot Nothing Then
                                device.AcquiredImage.Dispose()
                            End If
    
                            imageCount = imageCount + 1
                            Exit Select
    
                        Case Vintasoft.Twain.AcquireModalState.ScanCompleted
                            Console.WriteLine("Scan is completed.")
                            Exit Select
    
                        Case Vintasoft.Twain.AcquireModalState.ScanCanceled
                            Console.WriteLine("Scan is canceled.")
                            Exit Select
    
                        Case Vintasoft.Twain.AcquireModalState.ScanFailed
                            Console.WriteLine(String.Format("Scan is failed: {0}.", device.ErrorString))
                            Exit Select
                    End Select
                Loop While acquireModalState1 <> Vintasoft.Twain.AcquireModalState.None
    
                If imageCount <> 2 Then
                    Throw New ApplicationException("Wrong acquired image count.")
                End If
    
                ' close the device
                device.Close()
            End Using
        End Sub
    
    End Class
    
    
    
    namespace TwainExamples_CSharp
    {
        class SyncScan_StopFeeder
        {
    
            /// <summary>
            /// This method scans the first image, stops the document feeder,
            /// scans the second image.
            /// </summary>
            public static void ScanImage_StopFeeder_ScanImage()
            {
                int imageCount = 0;
    
                // create the device manager
                using (Vintasoft.Twain.DeviceManager deviceManager = new Vintasoft.Twain.DeviceManager())
                {
                    deviceManager.IsTwain2Compatible = true;
                    // open the device manager
                    deviceManager.Open();
    
                    // get the device
                    string deviceName = "KODAK Scanner: i5000";
                    Vintasoft.Twain.Device device = deviceManager.Devices.Find(deviceName);
                    if (device == null)
                        throw new System.ApplicationException(string.Format("Device '{0}' is not found.", deviceName));
    
                    // disable device UI
                    device.ShowUI = false;
                    // specify that device must be closed after scan
                    device.DisableAfterAcquire = true;
    
                    // open the device
                    device.Open();
                    // specify that 2 images must be acquired from scanner
                    device.XferCount = 2;
    
                    // run asynchronous image acquisition
                    Vintasoft.Twain.AcquireModalState acquireModalState = Vintasoft.Twain.AcquireModalState.None;
                    do
                    {
                        acquireModalState = device.AcquireModal();
                        switch (acquireModalState)
                        {
                            case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                                System.Console.WriteLine("Image is acquired.");
                                if (device.AcquiredImage != null)
                                    device.AcquiredImage.Dispose();
    
                                imageCount++;
    
                                // stop the feeder
                                device.StopFeeder();
                                break;
    
                            case Vintasoft.Twain.AcquireModalState.ScanCompleted:
                                System.Console.WriteLine("Scan is completed.");
                                break;
    
                            case Vintasoft.Twain.AcquireModalState.ScanCanceled:
                                System.Console.WriteLine("Scan is canceled.");
                                break;
    
                            case Vintasoft.Twain.AcquireModalState.ScanFailed:
                                System.Console.WriteLine(string.Format("Scan is failed: {0}.", device.ErrorString));
                                break;
                        }
                    }
                    while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);
    
                    if (imageCount != 1)
                        throw new System.ApplicationException("Wrong acquired image count.");
    
                    if (device.State != Vintasoft.Twain.DeviceState.TransferReady)
                        throw new System.ApplicationException("Feeder is NOT stopped.");
                    System.Console.WriteLine("Feeder is stopped.");
    
                    // continue asynchronous image acquisition
                    do
                    {
                        acquireModalState = device.AcquireModal();
                        switch (acquireModalState)
                        {
                            case Vintasoft.Twain.AcquireModalState.ImageAcquired:
                                System.Console.WriteLine("Image is acquired.");
    
                                if (device.AcquiredImage != null)
                                    device.AcquiredImage.Dispose();
    
                                imageCount++;
                                break;
    
                            case Vintasoft.Twain.AcquireModalState.ScanCompleted:
                                System.Console.WriteLine("Scan is completed.");
                                break;
    
                            case Vintasoft.Twain.AcquireModalState.ScanCanceled:
                                System.Console.WriteLine("Scan is canceled.");
                                break;
    
                            case Vintasoft.Twain.AcquireModalState.ScanFailed:
                                System.Console.WriteLine(string.Format("Scan is failed: {0}.", device.ErrorString));
                                break;
                        }
                    }
                    while (acquireModalState != Vintasoft.Twain.AcquireModalState.None);
    
                    if (imageCount != 2)
                        throw new System.ApplicationException("Wrong acquired image count.");
    
                    // close the device
                    device.Close();
                }
            }
    
        }
    }
    
    

    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