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# OnAnalyzeTable Method of the IImageViewerEvents Interface

> OnAnalyzeTable method of the IImageViewerEvents Interface in ABBYY FineReader Engine Visual Components on Windows — This method is implemented on the client-side.

This method is implemented on the client-side. It is called by ABBYY FineReader Engine before the start of the table analysis process which has been invoked from [Image Viewer](/fine-reader/engine/visual-components-reference/imageviewer) by calling the [MI\_AnalyzeTableStructure](/fine-reader/engine/visual-components-reference/imageviewer/image-viewer-commands#mi_analyzetablestructure) command. For the ways how this command can be called see the [Image Viewer Commands](/fine-reader/engine/visual-components-reference/imageviewer/image-viewer-commands) list.

The method delivers to the client the index of the table block whose structure is going to be analyzed. With the help of this method it is possible to cancel the operation.

## Syntax

### C++

```cpp theme={null}
HRESULT OnAnalyzeTable(
  int           BlockIndex,
  VARIANT_BOOL* Cancel
);
```

### C\#

```csharp theme={null}
void OnAnalyzeTable(
  int      BlockIndex,
  out bool Cancel
);
```

### Visual Basic .NET

```vb theme={null}
Sub OnAnalyzeTable( _
  BlockIndex As Integer, _
  ByRef Cancel As Boolean _
)
```

## Parameters

BlockIndex

\[in] Contains the index of the table block which is going to be analyzed. The index is in the [ILayout::VisualBlocks](/fine-reader/engine/api-reference/layout-related-objects/layout#visualblocks) collection.

Cancel

\[out] You may set this variable to TRUE to indicate that the process should be terminated. In this case, the table structure will not be analyzed.

## 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.

## 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

[IImageViewerEvents](/fine-reader/engine/visual-components-reference/iimageviewerevents)

[OnAnalyzePage](/fine-reader/engine/visual-components-reference/iimageviewerevents/onanalyzepage-method)

[OnAnalyzeRegion](/fine-reader/engine/visual-components-reference/iimageviewerevents/onanalyzeregion-method)