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# OnPageProcessed Method of the IProcessingEvents Interface

This method is implemented on the client-side. It is called by ABBYY FineReader Engine for the [InjectTextLayer](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/injecttextlayer-method) method of the [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface) object. It delivers to the client information about page processing completed. It can also process any system messages to help prevent the application from appearing unresponsive during long operations.

## Syntax

### C++

```cpp theme={null}
HRESULT OnPageProcessed(
  int                     Index,
  PageProcessingStageEnum Stage
);
```

### C\#

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

### Visual Basic .NET

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

## Parameters

Index

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

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

[IProcessingEvents](/fine-reader/engine/api-reference/supplementary-objects-and-methods/iprocessingevents)

[IEngine::InjectTextLayer](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/injecttextlayer-method)