Как отсканировать верхнюю сторону страницы с помощью TWAIN-сканера?

В этом разделе

Класс Vintasoft.Twain.DeviceImageLayout позволяет управлять компоновкой изображения на устройстве.

Вот пример, который демонстрирует, как получить только верхнюю сторону страницы:

/// <summary>
/// Acquire a part of image.
/// </summary>
public void AcquireImagePart(Vintasoft.Twain.Device device)
{
    // disable UI
    device.ShowUI = false;

    // open the device
    device.Open();

    // specify that black-white images must be acquired
    device.PixelType = Vintasoft.Twain.PixelType.BW;

    // set the inches as unit of measure
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;

    // specify that page size is undefined
    device.PageSize = Vintasoft.Twain.PageSize.None;

    // get current image layout
    System.Drawing.RectangleF imageLayout = device.ImageLayout.Get();
    // set the image layout (get only the top half of the page)
    device.ImageLayout.Set(0, 0, imageLayout.Width, imageLayout.Height / 2); 

    // acquire images asynchronously
    device.Acquire();
}

VB.NET

''' <summary>
''' Acquire a part of image.
''' </summary>
Public Sub AcquireImagePart(ByVal device As Vintasoft.Twain.Device)
    ' disable UI
    device.ShowUI = False

    ' open the device
    device.Open()

    ' specify that black-white images must be acquired
    device.PixelType = Vintasoft.Twain.PixelType.BW

    ' set the inches as unit of measure
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches

    ' specify that page size is undefined
    device.PageSize = Vintasoft.Twain.PageSize.None

    ' get current image layout
    Dim imageLayout As System.Drawing.RectangleF = device.ImageLayout.[Get]()
    ' set the image layout (get only the top half of the page)
    device.ImageLayout.[Set](0, 0, imageLayout.Width, imageLayout.Height / 2)

    ' acquire images asynchronously
    device.Acquire()
End Sub

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