How to add acquired images to PDF document

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Acquired image can be saved to a new PDF document or added to an existing PDF document.

Example: Here is an example that shows how to add acquired images to a PDF document.

VB.NET

Private VSTwain1 As New VintaSoftTwain()


''' <summary>
''' Scans images asynchronously.
''' </summary>
Private Sub StartScan()
    ' open the device manager
    If Not VSTwain1.DeviceManager_Open() Then
        Console.WriteLine(VSTwain1.errorString)
        Exit Sub
    End If

    ' select device using standard device selection dialog
    VSTwain1.DeviceManager_ShowDefaultDeviceSelectionDialog()

    ' open the device
    If Not VSTwain1.Device_Open() Then
        Console.WriteLine(VSTwain1.errorString)
        Exit Sub
    End If

    ' specify that device UI must be shown
    VSTwain1.Device_ShowUI = True

    ' set settings of PDF encoder
    VSTwain1.PdfEncoder_MultiPage = True
    VSTwain1.PdfEncoder_DocumentAuthor = "VintaSoft Ltd."
    Dim deviceName As String = VSTwain1.Device_Info_GetProductName(VSTwain1.DeviceManager_SelectedDeviceIndex)
    VSTwain1.PdfEncoder_DocumentTitle = String.Format("Documents acquired from {0}", deviceName)
    VSTwain1.PdfEncoder_DocumentCreator = "VintaSoft Twain ActiveX"
    VSTwain1.PdfEncoder_DocumentModificationDate = DateTime.Now

    ' subscribe to the device events
    AddHandler VSTwain1.DeviceImageAcquired, AddressOf VSTwain1_ImageAcquired
    AddHandler VSTwain1.DeviceScanCompleted, AddressOf VSTwain1_ScanCompleted
    AddHandler VSTwain1.DeviceScanFailed, AddressOf VSTwain1_ScanFailed
    AddHandler VSTwain1.DeviceScanCanceled, AddressOf VSTwain1_ScanCanceled

    ' acquire images asynchronously
    VSTwain1.Device_AcquireImage()
End Sub

Private Sub VSTwain1_ImageAcquired()
    ' get index of acquired image
    Dim imageIndex As Integer = VSTwain1.AcquiredImages_Count - 1

    ' save acquired image to a PDF document
    If Not VSTwain1.AcquiredImages_Save(imageIndex, "test.pdf") Then
        Console.WriteLine(VSTwain1.errorString)
    End If
End Sub

Private Sub VSTwain1_ScanCompleted()
    Console.WriteLine("Scan is completed.")
End Sub

Private Sub VSTwain1_ScanFailed(errorString As String)
    Console.WriteLine(String.Format("Scan is failed: {0}.", errorString))
End Sub

Private Sub VSTwain1_ScanCanceled()
    Console.WriteLine("Scan is canceled.")
End Sub

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