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ExportPage(int,Stream,RasterImageFormat,int) Method

Summary

Export the page at the specified index to a .NET stream.

Syntax

C#
VB
Java
Objective-C
C++
public void ExportPage( 
   int pageIndex, 
   Stream stream, 
   RasterImageFormat format, 
   int bitsPerPixel 
) 
Overloads Sub ExportPage( _ 
   ByVal pageIndex As Integer, _ 
   ByVal stream As Stream, _ 
   ByVal format As Leadtools.RasterImageFormat, _ 
   ByVal bitsPerPixel As Integer _ 
)  
- (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) 
             
void ExportPage(  
   int pageIndex, 
   Stream^ stream, 
   Leadtools.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.

Remarks

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.

Example

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Ocr; 
using Leadtools.Document.Writer; 
using Leadtools.Forms.Common; 
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.LEAD, 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.OcrLEADRuntimeDir); 
 
      // 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 OcrLEADRuntimeDir = @"C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Ocr 
Imports Leadtools.Document.Writer 
Imports Leadtools.Forms 
Imports Leadtools.ImageProcessing.Core 
 
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.LEAD, 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.OcrLEADRuntimeDir) 
 
      ' 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 OcrLEADRuntimeDir As String = "C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime" 
End Class 

Requirements

Target Platforms

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Leadtools.Ocr Assembly