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# OnPageProcessed 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](/fine-reader/engine/api-reference/document-related-objects/frdocument) object. It delivers to the client information about page processing completed.

<Note>
  In Windows, it can also process any system messages to help prevent the application from appearing unresponsive during long operations. This can be helpful in applications with a user interface.
</Note>

## Syntax

### C++

```csharp theme={null}
HRESULT OnPageProcessed(
  IFRDocument*            Sender,
  int                     Index,
  PageProcessingStageEnum Stage
);
```

### C\#

```csharp theme={null}
void OnPageProcessed(
  IFRDocument              Sender,
  int                     Index,
  PageProcessingStageEnum Stage
);
```

### Visual Basic .NET

```csharp theme={null}
Sub OnPageProcessed( _
  Sender As IFRDocument, _
  Index As Integer, _
  Stage As PageProcessingStageEnum _
)
```

## Parameters

Sender

\[in] This parameter refers to the [FRDocument](/fine-reader/engine/api-reference/document-related-objects/frdocument) object which sends notifications.

Index

\[in] This parameter contains the index of the processed page.

Stage

\[in] This variable of the [PageProcessingStageEnum](/fine-reader/engine/api-reference/enumerations/pageprocessingstageenum) type specifies the stage of processing.

## Return values

\[C++ only] If this method returns a value other than S\_OK, it indicates that an error occurred on the client-side.

## Remarks

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

[IFRDocumentEvents](/fine-reader/engine/api-reference/document-related-objects/ifrdocumentevents)

[FRDocument](/fine-reader/engine/api-reference/document-related-objects/frdocument)