ExportPage(Int32,Stream,RasterImageFormat,Int32) Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

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
)

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.

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

Copy Code

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.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(Nothing, 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)

            ' 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"
End Class

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.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(null, null, null, null);

         // 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";
}

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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