OnReadPages Method of the IDocumentViewerEvents Interface

This method is implemented on the client-side. It is called by ABBYY FineReader Engine before the start of the page recognition process which has been invoked from Document Viewer in one of the following ways:

  • Read Page item in the context menu is selected
  • Ctrl+R hot key is pressed
  • MI_Read command is called using the DoCommand method of the IDocumentViewer::Commands

It informs the client that selected pages are going to be recognized. With the help of this method it is possible to cancel the operation.



HRESULT OnReadPages( VARIANT_BOOL* Cancel );


void OnReadPages( out bool Cancel );

Visual Basic .NET

Sub OnReadPages(ByRef Cancel As Boolean)


[out] You may set this variable to TRUE to indicate that the process should be terminated. In this case, recognition will not be performed.

Return values

[C++ only] If this method returns a value other than S_OK, it indicates that an error occurred on the client-side, and in this case the value of the Cancel parameter is not taken into account.


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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