Public Delegate Function OcrSpellCheckCallback( _
   ByVal engine As IOcrEngine, _
   ByVal page As IOcrPage, _
   ByVal zoneIndex As Integer, _
   ByVal value As String _
) As OcrSpellCheckOpinion

Visual Basic (Usage)	Copy Code
Dim instance As New OcrSpellCheckCallback(AddressOf HandlerMethod)

public delegate OcrSpellCheckOpinion OcrSpellCheckCallback( 
   IOcrEngine engine,
   IOcrPage page,
   int zoneIndex,
   string value
)

public delegate OcrSpellCheckOpinion OcrSpellCheckCallback( 
   IOcrEngine^ engine,
   IOcrPage^ page,
   int zoneIndex,
   String^ value
)

Parameters

engine

The OCR engine instance.

page

The page currently being recognized. To get the index of this page, use OcrDocument.Pages.IndexOf.

zoneIndex

The zero-based index of the zone in page currently being recognized. To get the zone info, use IOcrPage.Zones passing zoneIndex as the index value.

value

Word or line to be checked by the method.

Return Value

You can set the OcrSpellCheckCallback to be used globally in the engine through the IOcrSpellCheckManager.SetSpellCheckCallback method.

The callback will only work with zones added manually by the user. The zones automatically found by the engine through IOcrPage.AutoZone will not cause the callback to be called.

This callback allows the user to intervene during the spell checking process. The callback is called by the checking subsystem of the engine during the recognition operation. The user can then influence the decision about the recognized result through the returned OcrSpellCheckOpinion value.

For an example, if the particular zone in the page to be recognized is allowed to contain digits and only certain values are allowed. The user can return the following values:

• If the value contains digits only and falls in the range of the values allowed, the user should return OcrSpellCheckOpinion.Sure
• If the value fails to to fulfill any of the above two requirements, the user should return OcrSpellCheckOpinion.Impossible

If the particular zone in the page to be recognized is allowed to have digits only by no further restrictions, the user can return the following values:

• If the value is digits only, the user should return OcrSpellCheckOpinion.Possible
• If the value contains digits plus punctuation (for example, a comma or a period), the user should return OcrSpellCheckOpinion.Unlikely

Note: User-defined checking through the OcrSpellCheckCallback callback is not supported when using the LEADTOOLS OCR Advantage Engine.

Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7

Reference