public RasterImage ExportPages(
int firstPageIndex,
int lastPageIndex
)
Overloads Function ExportPages( _
ByVal firstPageIndex As Integer, _
ByVal lastPageIndex As Integer _
) As RasterImage
- (nullable LTRasterImage *)exportPagesInRange:(NSRange)range
error:(NSError **)error
public RasterImage exportPages(int firstPageIndex,
int lastPageIndex)
RasterImage^ ExportPages(
int firstPageIndex,
int lastPageIndex
)
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.
A RasterImage object containing a copy of the image data of the specified page or pages.
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 objects inside the OCR document. The returned RasterImage object will need to be disposed.
To export a single page to a RasterImage object, use ExportPage(int pageIndex).
A short-cut to export all the pages in the OCR document to a multipage RasterImage object is ExportPages(1, -1)
.
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.
This example will add a few pages to an OCR document before exporting it back and saving it to disk as a multipage TIF file.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Ocr;
using Leadtools.Document.Writer;
using Leadtools.Forms.Common;
using Leadtools.ImageProcessing.Core;
public void ExportPagesToRasterImageExample()
{
string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "OcrMultiPage.tif");
RasterCodecs codecs = new RasterCodecs();
// 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(codecs, 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 a RasterImage object
RasterImage image = ocrDocument.Pages.ExportPages(1, 3);
Console.WriteLine("Image contains {0} pages", image.PageCount);
// Save this image to multi-page TIF file
codecs.Save(image, tifFileName, RasterImageFormat.Tif, 1, 1, -1, 1, CodecsSavePageMode.Overwrite);
}
// Shutdown the engine
// Note: calling Dispose will also automatically shutdown the engine if it has been started
ocrEngine.Shutdown();
}
codecs.Dispose();
}
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 ExportPagesToRasterImageExample()
Dim tifFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "OcrMultiPage.tif")
Dim codecs As New RasterCodecs()
' 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(codecs, Nothing, Nothing, LEAD_VARS.OcrLEADRuntimeDir)
' Create an OCR document
Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument()
' Loop through the images, add them to the document
For i As Integer = 0 To 3
Dim pageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, String.Format("Ocr{0}.tif", i + 1))
ocrDocument.Pages.AddPage(pageFileName, Nothing)
Next
Console.WriteLine("OCR Document contains {0} pages", ocrDocument.Pages.Count)
' Export the pages from index 1 to 3 to a RasterImage object
Dim image As RasterImage = ocrDocument.Pages.ExportPages(1, 3)
Console.WriteLine("Image contains {0} pages", image.PageCount)
' Save this image to multi-page TIF file
codecs.Save(image, tifFileName, RasterImageFormat.Tif, 1, 1, -1,
1, CodecsSavePageMode.Overwrite)
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()
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
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