Overloads Overridable Function InsertPage( _
   ByVal pageIndex As Integer, _
   ByVal fileName As String, _
   ByVal callback As OcrProgressCallback _
) As IOcrPage

Visual Basic (Usage)	Copy Code
Dim instance As IOcrPageCollection Dim pageIndex As Integer Dim fileName As String Dim callback As OcrProgressCallback Dim value As IOcrPage   value = instance.InsertPage(pageIndex, fileName, callback)

virtual IOcrPage InsertPage( 
   int pageIndex,
   string fileName,
   OcrProgressCallback callback
)

virtual IOcrPage^ InsertPage( 
   int pageIndex,
   String^ fileName,
   OcrProgressCallback^ callback
) 

Parameters

pageIndex

The zero-based index at which fileName should be inserted.

fileName

The name of the file containing the image.

callback

Optional callback to show operation progress.

Return Value

This example will load then insert in reverse order a group of image files from disk.

Visual Basic

Copy Code

Public Sub InsertPageFromFileExample()    ' Unlock the support needed for LEADTOOLS Plus OCR engine    RasterSupport.Unlock(RasterSupportType.Document, "Replace with your own key here")    RasterSupport.Unlock(RasterSupportType.OcrPlus, "Replace with your own key here")    RasterSupport.Unlock(RasterSupportType.OcrPlusPdfLeadOutput, "Replace with your own key here")    Dim imagesPath As String = LeadtoolsExamples.Common.ImagesPath.Path    Dim pdfFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Ocr1.pdf"    ' Load the Ocr1.tif, Ocr2.tif, Ocr3.tif and Ocr4.tif to a single RasterImage object    RasterCodecs.Startup()    Dim codecs As New RasterCodecs()    ' Create an instance of the engine    Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Plus, False)       ' Since we have a RasterCodecs object, re-use it in the OCR engine. Although       ' this demo will not use it, it is always a good practice       ocrEngine.Startup(codecs, Nothing, Nothing, Nothing)       ' Create an OCR document       Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument()          ' Loop through the images, insert them in the reverse order          For i As Integer = 0 To 3             Dim pageFileName As String = Path.Combine(imagesPath, String.Format("Ocr{0}.tif", i + 1))             ocrDocument.Pages.InsertPage(0, pageFileName, Nothing)          Next          ' Recognize          ocrDocument.Pages.Recognize(Nothing)          ' Save          ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, Nothing)       End Using       ' Shutdown the engine       ' Note: calling Dispose will also automatically shutdown the engine if it has been started       ocrEngine.Shutdown()    End Using    codecs.Dispose()    RasterCodecs.Shutdown() End Sub

C#

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public void InsertPageFromFileExample()  {     // Unlock the support needed for LEADTOOLS Plus OCR engine     RasterSupport.Unlock(RasterSupportType.Document, "Replace with your own key here");     RasterSupport.Unlock(RasterSupportType.OcrPlus, "Replace with your own key here");     RasterSupport.Unlock(RasterSupportType.OcrPlusPdfLeadOutput, "Replace with your own key here");     string imagesPath = LeadtoolsExamples.Common.ImagesPath.Path;     string pdfFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Ocr1.pdf";       // Load the Ocr1.tif, Ocr2.tif, Ocr3.tif and Ocr4.tif to a single RasterImage object     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();       // Create an instance of the engine     using(IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Plus, false))     {        // Since we have a RasterCodecs object, re-use it in the OCR engine. Although        // this demo will not use it, it is always a good practice        ocrEngine.Startup(codecs, null, null, null);          // Create an OCR document        using(IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument())        {           // Loop through the images, insert them in the reverse order           for(int i = 0; i < 4; i++)           {              string pageFileName = Path.Combine(imagesPath, string.Format("Ocr{0}.tif", i + 1));              ocrDocument.Pages.InsertPage(0, pageFileName, null);           }             // Recognize           ocrDocument.Pages.Recognize(0, 1, null);             // Save           ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, null);        }          // Shutdown the engine        // Note: calling Dispose will also automatically shutdown the engine if it has been started        ocrEngine.Shutdown();     }       codecs.Dispose();     RasterCodecs.Shutdown();  }

This method will load the first page from a raster image file on disk and inserts it to the OCR document at the specified location.

To insert all or specific range of the pages of a multi-page image file to the OCR document, use the InsertPages(int pageIndex, string fileName, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressCallback callback) method.

If you passed a RasterCodecs object to the IOcrEngine.Startup, then this method will use the same RasterCodecs object to load the raster image file. If you did not pass a RasterCodecs object, the engine will create an instance the first time one of the add or export page methods is called.

The image file in fileName can be any of the file formats supported by LEADTOOLS. For more information, refer to Summary of All Supported Image File Formats.

You can use the OcrProgressCallback to show the operation progress or to abort it. For more information and an example, refer to OcrProgressCallback.

The LEADTOOLS OCR engine supports pages of dots per inch (DPI) values of 150 and greater. If you try to add a page with a DPI of less than 150 then the engine might be able to recognize any data from this page.

Note, the LEADTOOLS Plus OCR engine does not support image size greater than A3 paper size (11.7 by 16.5 inches at 300 dpi). Attempting to add an image that has a size greater than A3 will result in an error. For document of size greater than the maximum allowed, you must first resize the image before adding it to the LEADTOOLS Plus OCR engine. The Professional and Advantage engines do not have a restriction on the image size.

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

Reference