GdPictureImaging.PdfOCRStartStream Method (Stream, Boolean, String, String, String, String, String)

Creates an empty searchable PDF stream in order to transfer multiple page using the PdfAddGdPictureImageToPdfOCR() until the PdfOCRStop() function is called.

The recognized text will be written invisibly to the PDF in order to simplify indexing and search.

public int PdfOCRStartStream(
    ref Stream PDFStream, 
    Boolean PDFA, 
    String Title, 
    String Author, 
    String Subject, 
    String Keywords, 
    String Creator
);

Visual Basic

Public Function PdfOCRStartStream(
    ByRef PDFStream As Stream, 
    ByVal PDFA As Boolean, 
    ByVal Title As String, 
    ByVal Author As String, 
    ByVal Subject As String, 
    ByVal Keywords As String, 
    ByVal Creator As String
) As Integer

Parameters

Parameters	Description
PDFStream	The Stream object to save the PDF.
PDFA	True to generate PDF in PDF/A format else False.
Title	The title of the PDF.
Author	The PDF Author.
Subject	The PDF Subject.
Keywords	The PDF Keywords.
Creator	The name of the application which creates the PDF.

Returns

0: The PDF could not created. Use the GetStat() function to determine the reason this function failed.

Non-zero: A PDF Identifier.

Remarks

To be used, this function must be unlocked with the SetLicenseNumberOCRTesseract() function.

Example

How to scan pages of a document feeder to a multipage searchable PDF file.

Copy Code

Dim oGdPictureImaging As New GdPictureImaging
Dim ImageID As Integer
Dim PDFStream As IO.Stream = New IO.MemoryStream
Dim bContinue As Boolean = True
Dim PdfID As Integer
 
oGdPictureImaging.SetLicenseNumber("XXX") 'Replace XXX by a demo or commercial license key
 
 
oGdPictureImaging.TwainOpenDefaultSource(Me.Handle)
oGdPictureImaging.TwainSetAutoFeed(True)
oGdPictureImaging.TwainSetAutoScan(True)
PdfID = oGdPictureImaging.PdfOCRStartStream(PDFStream, True, "", "", "", "", "")
 
If PdfID <> 0 Then
   While bContinue
         ImageID = oGdPictureImaging.TwainAcquireToGdPictureImage(Me.Handle)
         oGdPictureImaging.PdfAddGdPictureImageToPdfOCR(PdfID, ImageID, TesseractDictionary.TesseractDictionaryEnglish, "C:Program FilesGdPicture.NETRedistOCR", "")
         oGdPictureImaging.ReleaseGdPictureImage(ImageID)
         bContinue = (oGdPictureImaging.TwainGetState > TwainStatus.TWAIN_SOURCE_ENABLED)
   End While
   oGdPictureImaging.PdfOCRStop(PdfID)
End If
oGdPictureImaging.TwainCloseSource()