XferCount Property (Device)

In This Topic

Specifies how many images application wants to receive from the device.

Syntax

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration

Public Property XferCount As Int16

public short XferCount { get; set; }

public: __property short get_XferCount();
public: __property void set_XferCount(
   short value
);

public:
property short XferCount {
   short get();
   void set(short value);
}

Property Value

Possible values:
-1 - application wants to receive all available images from the device;
1..215 - application wants to receive only N images

Exceptions

Exception	Description
TwainInvalidStateException	Thrown if device is in wrong state.
TwainDeviceCapabilityException	Thrown if device does not support capability.
DebuggerException	Thrown if the .NET debugger is used and the function evaluation requires all threads to run.

Remarks

Call this property only when device is opened (State == DeviceState.Opened).

Example

This C#/VB.NET code shows how to acquire all images from the document feeder of device.

VB.NET


Public Sub ScanImageFromFeeder(device As Vintasoft.Twain.Device)
        device.ShowUI = False
        device.DisableAfterAcquire = True

        device.Open()
        device.XferCount = -1
        device.PixelType = Vintasoft.Twain.PixelType.RGB
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
        device.Resolution = New Vintasoft.Twain.Resolution(200F, 200F)

        If device.DocumentFeeder.DuplexMode <> Vintasoft.Twain.DuplexMode.None Then
                device.DocumentFeeder.DuplexEnabled = True
        End If

        If device.HasFeeder Then
                device.DocumentFeeder.Enabled = True
                device.XferCount = -1
                If device.DocumentFeeder.Loaded Then
                        device.DocumentFeeder.AutoFeed = True
                        device.Acquire()
                End If
        End If
End Sub


public void ScanImageFromFeeder(Vintasoft.Twain.Device device)
{
    device.ShowUI = false;
    device.DisableAfterAcquire = true;

    device.Open();
    device.XferCount = -1;
    device.PixelType = Vintasoft.Twain.PixelType.RGB;
    device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
    device.Resolution = new Vintasoft.Twain.Resolution(200f, 200f);

    if (device.DocumentFeeder.DuplexMode != Vintasoft.Twain.DuplexMode.None)
        device.DocumentFeeder.DuplexEnabled = true;

    if (device.HasFeeder)
    {
        device.DocumentFeeder.Enabled = true;
        device.XferCount = -1;
        if (device.DocumentFeeder.Loaded)
        {
            device.DocumentFeeder.AutoFeed = true;
            device.Acquire();
        }
    }
}

Requirements

Target Platforms: .NET 8, .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Reference

Device Class
Device Members

Acquire
AcquireModal
Open

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