ExportPages(int,int,string,RasterImageFormat,int,int,CodecsSavePageMode) Method

Summary

Exports one of more page at the specified index to a disk file.

Syntax

Objective-C

C++/CLI

Python

public void ExportPages( 
   int firstPageIndex, 
   int lastPageIndex, 
   string fileName, 
   RasterImageFormat format, 
   int bitsPerPixel, 
   int firstSavePageNumber, 
   CodecsSavePageMode pageMode 
)

- (BOOL)exportPagesInRange:(NSRange)range 
                      file:(NSString *)fileName 
                    format:(LTRasterImageFormat)format 
              bitsPerPixel:(NSUInteger)bitsPerPixel 
       firstSavePageNumber:(NSUInteger)firstSavePageNumber 
                  pageMode:(LTCodecsSavePageMode)pageMode 
                     error:(NSError **)error

void ExportPages(  
   int firstPageIndex, 
   int lastPageIndex, 
   String^ fileName, 
   RasterImageFormat format, 
   int bitsPerPixel, 
   int firstSavePageNumber, 
   CodecsSavePageMode pageMode 
)

def ExportPages(self,firstPageIndex,lastPageIndex,fileName,format,bitsPerPixel,firstSavePageNumber,pageMode):

Parameters

firstPageIndex
The zero-based index of the first page to export.

lastPageIndex
The zero-based index of the last page to export. A value of -1 means export up to and including the last page in the OCR document.

fileName
The name of the file to save the pages to.

format
The image file format to use.

bitsPerPixel
The bits/pixel value of the result image file.

firstSavePageNumber
1-based index of the first output page. If the output file already exists, then this parameter lets you control which pages to overwrite and/or where to append the new pages.

pageMode
Determines how to handle the page when saving to multipage formats. This can be one of the following:

Value	Meaning
CodecsSavePageMode.Append	Append the new page(s) to the end of the file. If the file does not exist, this option will create the file and add the pages to it. firstSavePageNumber is not used.
CodecsSavePageMode.Insert	Insert the new page(s) at the index specified by firstSavePageNumber.
CodecsSavePageMode.Replace	Replace the page(s) starting at the index specified by firstSavePageNumber.
CodecsSavePageMode.Overwrite	Overwrite the page(s) starting at the index specified by firstSavePageNumber.
CodecsSavePageMode.Append	Append the new page(s) to the end of the file. If the file does not exist, this option will create the file and add the pages to it.

Remarks

To export one page to a disk file, use ExportPages(int pageIndex, string fileName, RasterImageFormat format, int bitsPerPixel).

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

This example will add pages to an OCR document before exporting a range of it back to disk to a multipage file.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Ocr; 
using Leadtools.Document.Writer; 
using Leadtools.Forms.Common; 
using Leadtools.ImageProcessing.Core; 
 
public void ExportPagesToFile() 
{ 
   string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "OcrMultiPage.tif"); 
 
   // Create an instance of the engine 
   using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
   { 
      // 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()) 
      { 
         // Loop through the images, add them to the document 
         for (int i = 0; i < 4; i++) 
         { 
            string pageFileName = Path.Combine(LEAD_VARS.ImagesDir, string.Format("Ocr{0}.tif", i + 1)); 
            ocrDocument.Pages.AddPage(pageFileName, null); 
         } 
 
         Console.WriteLine("OCR Document contains {0} pages", ocrDocument.Pages.Count); 
 
         // Export the pages from index 1 to 3 to disk 
         ocrDocument.Pages.ExportPages(1, 3, tifFileName, RasterImageFormat.Tif, 1, 1, CodecsSavePageMode.Overwrite); 
      } 
 
      // 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:\LEADTOOLS23\Resources\Images"; 
   public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS23\Bin\Common\OcrLEADRuntime"; 
}

 
import java.io.File; 
import java.io.IOException; 
import java.net.URI; 
import java.net.URISyntaxException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.document.writer.DocumentFormat; 
import leadtools.imageprocessing.core.DeskewCommand; 
import leadtools.imageprocessing.core.DeskewCommandFlags; 
import leadtools.ocr.OcrDocument; 
import leadtools.ocr.OcrEngine; 
import leadtools.ocr.OcrEngineManager; 
import leadtools.ocr.OcrEngineType; 
 
 
public void IOcrPageCollectionsExportPagesToFile() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   final String LEAD_VARS_OCR_LEAD_RUNTIME_DIR = "C:\\LEADTOOLS23\\Bin\\Common\\OcrLEADRuntime"; 
   String tifFileName = combine(LEAD_VARS_IMAGES_DIR, "OcrMultiPage.tif"); 
 
   RasterCodecs codecs = new RasterCodecs(); 
   // Create an instance of the engine 
   OcrEngine ocrEngine = OcrEngineManager.createEngine(OcrEngineType.LEAD); 
   // 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, LEAD_VARS_OCR_LEAD_RUNTIME_DIR); 
   assertTrue("Engine unsuccessfully started", ocrEngine.isStarted()); 
 
   // Create an OCR document 
   OcrDocument ocrDocument = ocrEngine.getDocumentManager().createDocument(); 
   // Loop through the images, add them to the document 
   for (int i = 0; i < 4; i++) { 
      String pageFileName = combine(LEAD_VARS_IMAGES_DIR, "Ocr" + (i + 1) + ".tif"); 
      RasterImage image = codecs.load(pageFileName); 
      ocrDocument.getPages().addPage(image, null); 
   } 
 
   System.out.println("OCR Document contains " + ocrDocument.getPages().size() + " pages"); 
 
   // Export the pages from index 1 to 3 to disk 
   ILeadStream ls = LeadStreamFactory.create(tifFileName); 
   ocrDocument.getPages().exportPages(1, 3, ls, RasterImageFormat.TIF, 1, 1, CodecsSavePageMode.OVERWRITE); 
 
   // Shutdown the engine 
   // Note: calling Dispose will also automatically shutdown the engine if it has 
   // been started 
   ocrEngine.shutdown(); 
}