ExportPage(Int32,Stream,RasterImageFormat,Int32) Method

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void ExportPage( 
   int pageIndex,
   Stream stream,
   RasterImageFormat format,
   int bitsPerPixel
)

'Declaration

Overloads Sub ExportPage( _
   ByVal pageIndex As Integer, _
   ByVal stream As Stream, _
   ByVal format As RasterImageFormat, _
   ByVal bitsPerPixel As Integer _
)

'Usage

Dim instance As IOcrPageCollection
Dim pageIndex As Integer
Dim stream As Stream
Dim format As RasterImageFormat
Dim bitsPerPixel As Integer
 
instance.ExportPage(pageIndex, stream, format, bitsPerPixel)

void ExportPage( 
   int pageIndex,
   Stream stream,
   RasterImageFormat format,
   int bitsPerPixel
)

- (BOOL)exportPageAtIndex:(NSUInteger)pageIndex
                   stream:(LTLeadStream *)stream
                   format:(LTRasterImageFormat)format
             bitsPerPixel:(NSUInteger)bitsPerPixel
                    error:(NSError **)error

public void exportPage(int pageIndex,
                       ILeadStream stream,
                       RasterImageFormat format,
                       int bitsPerPixel)

function Leadtools.Forms.Ocr.IOcrPageCollection.ExportPage(Int32,Stream,RasterImageFormat,Int32)( 
   pageIndex ,
   stream ,
   format ,
   bitsPerPixel 
)

void ExportPage( 
   int pageIndex,
   Stream^ stream,
   RasterImageFormat format,
   int bitsPerPixel
)

Parameters

pageIndex: The zero-based index of the page to export.
stream: The .NET stream to save the page to.
format: The image file format to use.
bitsPerPixel: The bits/pixel value of the result image file.

To export more than one page to a multi-page file to a stream, use ExportPages(int firstPageIndex, int lastPageIndex, Stream stream, RasterImageFormat format, int bitsPerPixel, int firstSavePageNumber, CodecsSavePageMode pageMode).

You can export the page to any of the file formats supported by LEADTOOLS. For more information, refer to Summary of All Supported Image File Formats.

This member only works with memory-based documents and will throw an exception otherwise. For more information, refer to IOcrDocumentManager.CreateDocument and Programming with the LEADTOOLS .NET OCR.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms.Ocr
Imports Leadtools.Forms.DocumentWriters
Imports Leadtools.Forms
Imports Leadtools.ImageProcessing.Core

<TestMethod>
Public Sub ExportPageToStream()
   Dim tifFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif")
   Dim exportedFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "OcrExported.jpg")
   ' Create an instance of the engine
   Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, 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(Nothing, Nothing, Nothing, LEAD_VARS.OcrAdvantageRuntimeDir)

      ' Create an OCR document
      Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument()
         ' Add the image to the document
         ocrDocument.Pages.AddPage(tifFileName, Nothing)

         ' Save it to a file stream
         Using fs As FileStream = File.Create(exportedFileName)
            ocrDocument.Pages.ExportPage(0, fs, RasterImageFormat.Jpeg, 0)
         End Using
      End Using

      ' Shutdown the engine
      ' Note: calling Dispose will also automatically shutdown the engine if it has been started
      ocrEngine.Shutdown()
   End Using
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
Public Const OcrAdvantageRuntimeDir As String = "C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms.Ocr;
using Leadtools.Forms.DocumentWriters;
using Leadtools.Forms;
using Leadtools.ImageProcessing.Core;

public void ExportPageToStream()
{
   string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif");
   string exportedFileName = Path.Combine(LEAD_VARS.ImagesDir, "OcrExported.jpg");
   // Create an instance of the engine
   using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, 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(null, null, null, LEAD_VARS.OcrAdvantageRuntimeDir);

      // Create an OCR document
      using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument())
      {
         // Add the image to the document
         ocrDocument.Pages.AddPage(tifFileName, null);

         // Save it to a file stream
         using (FileStream fs = File.Create(exportedFileName))
         {
            ocrDocument.Pages.ExportPage(0, fs, RasterImageFormat.Jpeg, 0);
         }
      }

      // Shutdown the engine
      // Note: calling Dispose will also automatically shutdown the engine if it has been started
      ocrEngine.Shutdown();
   }
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
public const string OcrAdvantageRuntimeDir = @"C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime";
}

Target Platforms

Reference

IOcrPageCollection Interface
IOcrPageCollection Members
Overload List
OcrEngineManager Class
OcrEngineType Enumeration
IOcrPage Interface
Programming with the LEADTOOLS .NET OCR
Summary of All Supported Image File Formats