OnDeleteBlocks Method of the IImageViewerEvents Interface
This method is implemented on the client-side. It is called by ABBYY FineReader Engine before deleting the blocks in Image Viewer if the process is invoked in one of the following ways:
- with the help of the Delete Block (MI_ChooseTool_DeleteBlock) tool
- by calling MI_BlockDelete command
See the Image Viewer Commands list to find out how the commands can be called.
The method delivers to the client the indices of the blocks which are going to be deleted. With the help of this method it is possible to cancel the operation.
HRESULT OnDeleteBlocks( IIntsCollection* BlocksToDelete, VARIANT_BOOL* Cancel );
void OnDeleteBlocks( IIntsCollection BlocksToDelete, out bool Cancel );
Visual Basic .NET
Sub OnDeleteBlocks( _ BlocksToDelete As IIntsCollection, _ ByRef Cancel As Boolean _ )
- [in] Contains the indices of blocks that have to be deleted as an IntsCollection object.
- [out] You may set this variable to TRUE to indicate that the process should be terminated. In this case, the blocks will not be deleted.
[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).