AddPages(Stream,Int32,Int32,OcrProgressCallback) Method

void AddPages( 
   Stream stream,
   int imageFirstPageNumber,
   int imageLastPageNumber,
   OcrProgressCallback callback
)

'Declaration
 
Overloads Sub AddPages( _
   ByVal stream As Stream, _
   ByVal imageFirstPageNumber As Integer, _
   ByVal imageLastPageNumber As Integer, _
   ByVal callback As OcrProgressCallback _
) 

'Usage
 
Dim instance As IOcrPageCollection
Dim stream As Stream
Dim imageFirstPageNumber As Integer
Dim imageLastPageNumber As Integer
Dim callback As OcrProgressCallback
 
instance.AddPages(stream, imageFirstPageNumber, imageLastPageNumber, callback)

void AddPages( 
   Stream stream,
   int imageFirstPageNumber,
   int imageLastPageNumber,
   OcrProgressCallback callback
)

- (BOOL)addPages:(LTLeadStream*)stream
eFirstPageNumber:(int)imageFirstPageNumber
geLastPageNumber:(int)imageLastPageNumber
          target:(id)target
        selector:(SEL)selector
           error:(NSError**)outError;
            

public void addPages(ILeadStream stream,
                     int imageFirstPageNumber,
                     int imageLastPageNumber,
                     OcrProgressListener callback)
            

function Leadtools.Forms.Ocr.IOcrPageCollection.AddPages(Stream,Int32,Int32,OcrProgressCallback)( 
   stream ,
   imageFirstPageNumber ,
   imageLastPageNumber ,
   callback 
)

void AddPages( 
   Stream^ stream,
   int imageFirstPageNumber,
   int imageLastPageNumber,
   OcrProgressCallback^ callback
) 

Parameters

stream

The .NET stream containing the multi-page image file.

imageFirstPageNumber

1-based index of the first page in stream to add.

imageLastPageNumber

1-based index of the last page in stream to add. A value of -1 means add up to and including the last page in stream.

callback

Optional callback to show operation progress.

A short-cut to add all the pages in a .NET stream to the OCR document is AddPages(stream, 1, -1, callback).

To add the first page from a multi-page file stored in a .NET stream, you can also use AddPage(Stream stream, OcrProgressCallback callback).

This method will add the page(s) to the end of the collection if you already have pages in this IOcrPageCollection.

The image file in stream can be any of the file formats supported by LEADTOOLS. For more information, refer to Summary of All Supported Image File Formats.

You can use the OcrProgressCallback to show the operation progress or to abort it. For more information and an example, refer to OcrProgressCallback.

The LEADTOOLS OCR engine supports pages of dots per inch (DPI) values of 150 and greater. If you try to add a page with a DPI of less than 150 then the engine might be able to recognize any data from this page.

Note, the LEADTOOLS Plus OCR engine does not support image size greater than A3 paper size (11.7 by 16.5 inches at 300 dpi). Attempting to add an image that has a size greater than A3 will result in an error. For document of size greater than the maximum allowed, you must first resize the image before adding it to the LEADTOOLS Plus OCR engine. The Professional and Advantage engines do not have a restriction on the image size.

Note: The value of the "Recognition.ShareOriginalImage" (only supported by the Advantage OCR engine) setting is not used when calling this method. The engine loads the image(s) and sets them in the pages internally. The original image reference can be obtained from the page using IOcrPage.GetRasterImage(OcrPageType.Original). Sharing the original image minimizes the memory used during OCR operations.

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