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LoadZonesAsync(IStorageFile,Int32) Method

Summary

Loads zones from a multi-page zones Windows Runtime StorageFile.

Syntax

C#
VB
WinRT C#
C++
IAsyncAction LoadZonesAsync(  
   IStorageFile file, 
   int pageNumber 
) 
Overloads Function LoadZonesAsync( _ 
   ByVal file As IStorageFile, _ 
   ByVal pageNumber As Integer _ 
) As IAsyncAction 
IAsyncAction LoadZonesAsync(  
   IStorageFile file, 
   int pageNumber 
) 
function Leadtools.Forms.Ocr.IOcrPage.LoadZonesAsync(IStorageFile,Int32)(  
   file , 
   pageNumber  
) 
IAsyncAction^ LoadZonesAsync(  
   IStorageFile^ file, 
   int pageNumber 
)  

Parameters

file
The Windows Runtime storage file object containing the zones to load.

pageNumber
1-based page number.

Return Value

The IAsyncAction object for this operation.

Remarks

To save and load the zones of OCR pages, you can use one of these methods:

Note on loading zones from a multi-page zone file: If the file does not contain zones data with the correct page number, the engine will not load any zones for this page. After the method returns, any OCR page that did not have zones data will contain zero zones (the Zones property contains 0 items). You can then use IOcrPage.AutoZone if required to re-zone this page.

Use this method to load the zones previously saved into a disk file with the SaveZonesAsync(file) method. This method will load the zones in the first page found in the file. To load the zones of a particular page, use LoadZones(fileName, pageNumber).

The zones of this page will first be cleared prior to loading the new items.

After this method finishes, you can access the loaded zones in the Zones property.

Saving zones to an external file could be useful when you are processing forms. For example, you can load one of the forms and automatically find the zones inside it using AutoZone, if the automatic zone detection was not 100 percent satisfactory, you can update the zones in the Zones collection manually and then save the result with SaveZonesAsync(file). Once the zones are saved. You can now process all similar forms in the following manner:

  • Add the form page or pages to an OCR document using the Pages collection of IOcrDocument.
  • Load the zones previously saved for each page using LoadZonesAsync(file).
  • Skip calling AutoZone and directly call Recognize. This will also speed up the recognition process considerably.
Requirements

Target Platforms

Help Version 19.0.2017.10.27
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Leadtools.Forms.Ocr Assembly