Overloads Overridable Function ExportPage( _
   ByVal pageIndex As Integer _
) As RasterImage

Visual Basic (Usage)	Copy Code
Dim instance As IOcrPageCollection Dim pageIndex As Integer Dim value As RasterImage   value = instance.ExportPage(pageIndex)

virtual RasterImage ExportPage( 
   int pageIndex
)

virtual RasterImage ExportPage( 
   int pageIndex
) 

Parameters

pageIndex

The zero-based index of the page to export.

Return Value

This example will add a page to an OCR document before exporting it back and saving it to disk

Visual Basic

Copy Code

Public Sub ExportPageToRasterImageExample()    ' 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 tifFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Ocr1.tif"    Dim exportedFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "OcrExported.jpg"    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()          ' Add the image to the document          ocrDocument.Pages.AddPage(tifFileName, Nothing)          ' Export it back as a RasterImage          Dim image As RasterImage = ocrDocument.Pages.ExportPage(0)          ' Save this image to disk          codecs.Save(image, exportedFileName, RasterImageFormat.Jpeg, 0)          ' We need to dispose the image ourselves          image.Dispose()       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 ExportPageToRasterImageExample()  {     // 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 tifFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Ocr1.tif";     string exportedFileName = LeadtoolsExamples.Common.ImagesPath.Path + "OcrExported.jpg";       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())        {             // Add the image to the document           ocrDocument.Pages.AddPage(tifFileName, null);             // Export it back as a RasterImage           RasterImage image = ocrDocument.Pages.ExportPage(0);             // Save this image to disk           codecs.Save(image, exportedFileName, RasterImageFormat.Jpeg, 0);             // We need to dispose the image ourselves           image.Dispose();        }          // 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 copies the image data to the created RasterImage object image. Therefore, after this method returns, there is no relationship between the returned value and the IOcrPage inside the OCR document. The returned RasterImage object will need to be disposed.

To export more than one page to a multi-page RasterImage object, use ExportPages(int firstPageIndex, int lastPageIndex).

This method is identical to calling IOcrPage.GetRasterImage on the page whose index is at pageIndex.

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

Reference