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InsertPage(int,Stream,OcrProgressCallback) Method

Summary

Inserts the image stored in a .NET stream to the specified location.

Syntax

C#
VB
Java
Objective-C
C++
public IOcrPage InsertPage( 
   int pageIndex, 
   Stream stream, 
   OcrProgressCallback callback 
) 
Overloads Function InsertPage( _ 
   ByVal pageIndex As Integer, _ 
   ByVal stream As Stream, _ 
   ByVal callback As Leadtools.Ocr.OcrProgressCallback _ 
) As Leadtools.Ocr.IOcrPage 
- (nullable LTOcrPage *)insertPageAtIndex:(NSUInteger)pageIndex 
                                   stream:(LTLeadStream *)stream 
                                    error:(NSError **)error 
             
public OcrPage insertPage(int pageIndex, 
                          ILeadStream stream, 
                          OcrProgressListener callback) 
             

Parameters

pageIndex
The zero-based index at which stream should be inserted.

stream
The .NET stream object containing the image.

callback
Optional callback to show operation progress.

Return Value

The IOcrPage object that define the newly inserted page.

Remarks

This method will load the first page from a raster image file in the stream and inserts it to the OCR document at the specified location.

To insert all or specific range of the pages of a multi-page image from a stream to the OCR document, use the InsertPages(int pageIndex, Stream stream, int imageFirstPageNumber, int imageLastPageNumber, OcrProgressCallback callback) method.

If you passed a RasterCodecs object to the IOcrEngine.Startup, then this method will use the same RasterCodecs object to load the raster image file. If you did not pass a RasterCodecs object, the engine will create an instance the first time one of the add or export page methods is called.

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 value of the "Recognition.ShareOriginalImage" (only supported by the LEADTOOLS OCR Module - LEAD 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.

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

For an example on how to insert a page, refer to InsertPage. For an example on how to add pages from a stream, refer to AddPage.

Requirements

Target Platforms

Help Version 20.0.2018.1.18
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