OnProgress Method of the IFRDocumentEvents Interface

This method is implemented on the client-side. It is called by ABBYY FineReader Engine for some of the methods of the FRDocument object. It delivers to the client information about approximate percentage of the current operation (image loading, analysis, recognition, etc.). Its implementation may show a progress indicator, as it is done in ABBYY FineReader. It may also process any Windows messages to avoid an effect that the application "is not responding" during long operations.



HRESULT OnProgress(
  IFRDocument*  Sender,
  int           Percentage,


void OnProgress(
  IFRDocument Sender,
  int        Percentage,
  ref bool   Cancel

Visual Basic .NET

Sub OnProgress( _
  Sender As IFRDocument, _
  Percentage As Integer, _
  ByRef Cancel As Boolean _


[in] This parameter refers to the FRDocument object which sends notifications.
[in] This parameter contains the percent of the work currently done. It is in the range from 0 to 100.
[in, out] You may set this variable to TRUE to indicate that the process should be terminated. In this case, the processing function returns E_ABORT.

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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