OnBlockSelectionChanged Method of the IImageViewerEvents Interface

This method is implemented on the client-side. It is called by ABBYY FineReader Engine after blocks selection has been changed either in Image Viewer, or in Zoom Viewer synchronized with Image Viewer.

It delivers to the client the index of the selected block.



HRESULT OnBlockSelectionChanged(
  int          BlockIndex,


void OnBlockSelectionChanged(
  int  BlockIndex,
  bool Selected

Visual Basic .NET

Sub OnBlockSelectionChanged( _
  BlockIndex As Integer, _
  Selected As Boolean _


[in] Contains the index of the selected block. The index is in the ILayout::VisualBlocks collection.
[in] Specifies whether the block is selected.

Return values

This method has no specific return values. It returns the standard return values of ABBYY FineReader Engine functions.


The client implementation of this method must assure that all exceptions thrown inside the method are caught and handled and no exceptions are propagated outside the method. Propagation of an exception outside the method may lead to unpredictable results (such as program termination).

See also


24.03.2023 8:51:52

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