VintaSoft Twain .NET SDK v10.2
GetAsStream Method (AcquiredImage)
Example 




Vintasoft.WpfTwain Namespace > AcquiredImage Class : GetAsStream Method
Encoder settings.
Returns this image as a System.IO.MemoryStream object.
Syntax
'Declaration
 
Public Function GetAsStream( _
   ByVal encoderSettings As TwainImageEncoderSettings _
) As MemoryStream
'Usage
 
Dim instance As AcquiredImage
Dim encoderSettings As TwainImageEncoderSettings
Dim value As MemoryStream
 
value = instance.GetAsStream(encoderSettings)

Parameters

encoderSettings
Encoder settings.

Return Value

This image as System.IO.MemoryStream.
Exceptions
ExceptionDescription
Thrown if error occurs at the image saving.
Remarks
Method:
Example
This example shows how to store all acquired images as multipage PDF document in the memory. Further PDF document can be saved into database or transferred to the server.
Private Shared Sub AcquireImagesAndSaveToStreamAsPdf()
    ' create the device manager
    Using deviceManager As New DeviceManager()
        ' open the device manager
        deviceManager.Open()
            
        ' select the device in the default device selectio ndialog
        deviceManager.ShowDefaultDeviceSelectionDialog()
            
        ' get reference to the selected device
        Dim device As 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
            
        ' acquire images from device
        Dim acquireModalState1 As AcquireModalState = AcquireModalState.None
        Dim mem As MemoryStream = Nothing
        Dim firstImage As Boolean = True
        Do
            acquireModalState1 = device.AcquireModal()
            Select Case acquireModalState1
                Case AcquireModalState.ImageAcquired
                    ' save all acquired images as PDF stored in the memory
                    If firstImage Then
                        ' get the first image as PDF stored in the memory
                        mem = device.AcquiredImage.GetAsStream(New TwainPdfEncoderSettings())
                        firstImage = False
                    Else
                        ' add image to PDF stored in the memory
                        device.AcquiredImage.Save(mem, New TwainPdfEncoderSettings())
                    End If
            
                    ' dispose the acquired image
                    device.AcquiredImage.Dispose()
                    Exit Select
            End Select
        Loop While acquireModalState1 <> AcquireModalState.None
            
        ' Upload stream data to the server or doing something else...
        ' ...
            
        ' close the device
        device.Close()
            
        ' close the device manager
        deviceManager.Close()
    End Using
End Sub
static void AcquireImagesAndSaveToStreamAsPdf()
{
    // create the device manager
    using (DeviceManager deviceManager = new DeviceManager())
    {
        // open the device manager
        deviceManager.Open();
            
        // select the device in the default device selectio ndialog
        deviceManager.ShowDefaultDeviceSelectionDialog();
            
        // get reference to the selected device
        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;
            
        // acquire images from device
        AcquireModalState acquireModalState = AcquireModalState.None;
        MemoryStream mem = null;
        bool firstImage = true;
        do
        {
            acquireModalState = device.AcquireModal();
            switch (acquireModalState)
            {
                case AcquireModalState.ImageAcquired:
                    // save all acquired images as PDF stored in the memory
                    if (firstImage)
                    {
                        // get the first image as PDF stored in the memory
                        mem = device.AcquiredImage.GetAsStream(new TwainPdfEncoderSettings());
                        firstImage = false;
                    }
                    else
                    {
                        // add image to PDF stored in the memory
                        device.AcquiredImage.Save(mem, new TwainPdfEncoderSettings());
                    }
            
                    // dispose the acquired image
                    device.AcquiredImage.Dispose();
                    break;
            }
        }
        while (acquireModalState != AcquireModalState.None);
            
        // Upload stream data to the server or doing something else...
        // ...
            
        // close the device
        device.Close();
            
        // close the device manager
        deviceManager.Close();
    }
}
Requirements

Target Platforms: Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2012, Windows Server 2008, Windows Server 2003

See Also

Reference

AcquiredImage Class
AcquiredImage Members