> ## Documentation Index > Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt > Use this file to discover all available pages before exploring further. # ABBYY FineReader Engine 12 and 11 Compatibility > Compatibility changes between ABBYY FineReader Engine 12 and 11 — full list of API changes and recompilation suggestions to migrate code from FRE 11. ABBYY FineReader Engine 12 is not binary compatible with ABBYY FineReader Engine 11. Applications that were compiled using ABBYY FineReader Engine 11 should be recompiled using ABBYY FineReader Engine 12 headers and library. Some changes of the source code may be necessary because of the ABBYY FineReader Engine API improvements. This article contains a full list of changes, together with suggestions on rewriting your code to work under the new version. Main changes: * The obsolete DocumentAnalyzer and Exporter objects have been removed, together with the processing methods of the [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface) object. Use the more efficient methods of the [FRDocument](/fine-reader/engine/api-reference/document-related-objects/frdocument) and [FRPage](/fine-reader/engine/api-reference/document-related-objects/frpage) objects, which take care of all the information needed for full document processing. You are no longer required to maintain the DocumentInfo object on all processing stages, keep track of all the image documents with the corresponding layouts, or implement the IRecognizedPages interface. * The API which provided access to the logical structure of the document (DocumentStructure, PageStructure and their subobjects) has been removed. Editing the properties and contents of the document via the deleted objects could have led to unpredictable results on export. If you need to verify or postprocess the recognition results, work with the data via the [Layout](/fine-reader/engine/api-reference/document-related-objects/frpage#layout) subobject of each [FRPage](/fine-reader/engine/api-reference/document-related-objects/frpage) and call any of the methods which perform document synthesis when done. The logical structure of the document will then be recreated and used at the export stage, although it will no longer be available for editing via FineReader Engine API. The future versions of ABBYY FineReader Engine may provide read-only access to some of the document logical structure. * The Classification API has been completely replaced, using new improved algorithms and providing built-in cross-validation techniques. * The [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface) object must now be loaded by [InitializeEngine](/fine-reader/engine/api-reference/functions/initializeengine-function) function. The GetEngineObject and GetEngineObjectEx functions for Engine loading are removed from ABBYY FineReader Engine. | Property/Method/Constant | What has happened? | Comment | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | CreateDocumentAnalyzer CreateDocumentInfo CreateExporter | Removed | The methods are not necessary anymore as the objects they created have been removed. | | [CreateExportFileWriter](/fine-reader/engine/api-reference/engine-object-iengine-interface/creation-methods/createexportfilewriter-method) | Signature changed | The deprecated PagesCount parameter has been removed. | | CreateImageDocumentsInMemory

**Note:** *Windows only.* | Removed | The image documents are always created in memory. You can use the [SaveTo](/fine-reader/engine/api-reference/image-related-objects/imagedocument/saveto-method) or [SaveToFile](/fine-reader/engine/api-reference/image-related-objects/imagedocument/savetofile-method) methods whenever you need to save the image document on disk. | | CreateLayout | Removed | The [Layout](/fine-reader/engine/api-reference/layout-related-objects/layout) object can no longer be used apart from the page it corresponds to. | | [CreateMultipageImageWriter](/fine-reader/engine/api-reference/engine-object-iengine-interface/creation-methods/createmultipageimagewriter-method) | Behavior changed | This method now accepts extended image saving parameters for JPEG and TIFF formats. | | CreateMultipageImageWriterEx | Renamed | This method is now called [CreateMultipageImageWriter](/fine-reader/engine/api-reference/engine-object-iengine-interface/creation-methods/createmultipageimagewriter-method). The old implementation of the CreateMultipageImageWriter method has been removed. | | ExportPage | Removed | Use the [IFRPage::Export](/fine-reader/engine/api-reference/document-related-objects/frpage/export-method) method instead. | | ExportPagesEx | Removed | Use the [IFRDocument::Export](/fine-reader/engine/api-reference/document-related-objects/frdocument/export-method) method instead. | | [InjectTextLayer](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/injecttextlayer-method) | Behavior changed | This method now provides additional parameters of text layer injection, as well as the option to select the pages of the PDF file to be processed and a callback interface to handle warnings and errors. | | InjectTextLayerEx InjectTextLayerEx2 | Removed | The new version of the [InjectTextLayer](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/injecttextlayer-method) method now provides all the options formerly available in these methods. | | OpenImageFile | Removed | Use the [IFRDocument::AddImageFile](/fine-reader/engine/api-reference/document-related-objects/frdocument/addimagefile-method) method to open an image file and add it to the document for processing. The [ImageDocument](/fine-reader/engine/api-reference/image-related-objects/imagedocument) object will be accessible via the corresponding [FRPage](/fine-reader/engine/api-reference/document-related-objects/frpage). | | PrepareImageFile | Removed | Use the [IFRDocument::AddImageFile](/fine-reader/engine/api-reference/document-related-objects/frdocument/addimagefile-method) method to open an image file and add it to the document for processing. The [ImageDocument](/fine-reader/engine/api-reference/image-related-objects/imagedocument) object will be accessible via the corresponding [FRPage](/fine-reader/engine/api-reference/document-related-objects/frpage) and can be saved on disk later. | | ProcessPage | Removed | Use the [IFRDocument::Process](/fine-reader/engine/api-reference/document-related-objects/frdocument/process-method) method instead. | | ProcessPagesEx | Removed | Use the [IFRDocument::Process](/fine-reader/engine/api-reference/document-related-objects/frdocument/process-method) method instead. | | SynthesizePagesEx | Removed | Use the [IFRDocument::Synthesize](/fine-reader/engine/api-reference/document-related-objects/frdocument/synthesize-method) method instead. | | OpenMemoryImageFormat10 | Removed | This method was provided only for compatibility with ABBYY FineReader Engine 10. | | [OpenBitmap](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/openbitmap-method) [OpenBitmapBits](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/openbitmapbits-method)
[OpenDib](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/opendib-method)
[PrepareBitmap](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/preparebitmap-method)
[PrepareBitmapBits](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/preparebitmap-method)
[PrepareDib](/fine-reader/engine/api-reference/engine-object-iengine-interface/processing-methods/preparedib-method) | Deprecated in Linux and macOS | These properties are now deprecated and will be deleted in future versions. | | Method | What has happened? | Comment | | ----------- | ------------------ | -------------------------------------------------------- | | Load LoadEx | Removed | Deprecated methods, use Engine.InitializeEngine instead. |

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
ImageDocument	SuppressColorObjects	Removed	Instead use the RemoveColorObjectsEx method, which allows you to remove objects of several specified hues at once, and also receive the image of removed objects.
	RemoveGarbage	Behavior changed	This method still searches for garbage on the black-and-white plane, but removes it from all color planes of the image.
	RemoveGarbageEx	Renamed	This method is now called RemoveGarbage. The old implementation of that method has been removed.
PrepareImageMode	ImageCompression	Renamed, type changed	This property is now called CompressImage and is of the ThreeStatePropertyValueEnum type. The default functions as before.
PrepareImageMode	KeepOriginalCoordinatesInfo	Deprecated	This property is now deprecated and will be deleted in future versions.
ImageCompressionEnum		Removed	The property that used this enumeration now has another type.
Image	EstimateBitmapSize GetBitmap	Deprecated in Linux and macOS	These properties are now deprecated and will be deleted in future versions.
TrainingImage	SetBitmapBits	Deprecated in Linux and macOS	This property is now deprecated and will be deleted in future versions.

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
Block	BackgroundColor	Behavior changed	This property is now read-only.
Block	BlockLayerType	Behavior changed	This property is now read-only. For RasterPictureBlock and VectorPictureBlock, the layer type can be changed using the SetBlockLayerType method.
BlockLayerTypeEnum	BLT\_Unknown	Removed	This constant is no longer in use.

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
Paragraph	HasOverflowedHead HasOverflowedTail	Removed	These properties are no longer supported: detecting the paragraph split over two pages is not possible anymore.
	InlinePictureID	Removed	This property returned the ID of PageElement corresponding to the picture, and is no longer useful because PageElement object has been removed with the rest of document structure API.
	DeleteBookmark	Behavior changed	This method now requires the specification of user bookmark name in the format "UserDefinedBookmark:\".
ParagraphStyle	ParagraphParams	Removed	The paragraph properties can now be accessed only via the Paragraph object.
	HeadingLevel Name ParagraphRole	Behavior changed	These properties are now read-only. No properties of paragraph style may be edited.
	CopyFrom	Removed	No properties of paragraph style may be edited or copied from another object.
FontStyle	ParagraphStyle	Removed	The paragraph style may be accessed via the Paragraph object.
TabPositions	AddNewEx	Renamed	This method is now called AddNew. The old implementation of the AddNew method has been removed.
TabPositions	AddNew	Behavior changed	This method now allows you to set all the properties of the tab leader at creation.
TabPosition	CopyFrom	Removed	All the properties of a tab stop should be specified on the object's creation with the help of the AddNew method of the TabPositions object. They may not be changed or copied from another object.
TabPosition	Alignment Position TabLeaderType	Behavior changed	The properties are now read-only. They should be specified on the object's creation with the help of the AddNew method of the TabPositions object and may not be changed or copied from another object.
TextOrientation	IsVerticallyMirrored	Removed	This property was deprecated in the previous version.
Text	TextRole	Removed	This property has been removed due to the removal of document logical structure API, as it is no longer possible to access the parts of document by their role in the logical structure.
TextRoleEnum		Removed	The property that used this enumeration has been removed.
CharParams	IsWordStart	Removed	This property was deprecated and scheduled for removal. It was replaced by two properties: IsWordLeftmost, which specifies the first character in the word if read from left to right, and IsWordFirst, which specifies the logically first character for whichever reading direction is used in the language.
CharacterFlags	CFL\_Picture	Removed	The property which used this constant has been removed.
BarcodeSymbol	Bottom Left Right Top	Deprecated	These properties are now deprecated and will be deleted in future versions.
Hyperlink	Target	Behavior changed	This property now requires the specification of user bookmark name in the format "UserDefinedBookmark:\" for creating a hyperlink.

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
IFRDocumentEventsEx		Renamed	This interface is now called IFRDocumentEvents. The old version of that interface has been removed.
IFRDocumentEvents	OnWarning	Parameters changed	This method now has an additional parameter which specifies the index of the page in the document to which the warning refers.
Artefact BackgroundLayer Caption Captions DocumentElement DocumentSection DocumentStream DocumentStructure Footnote Footnotes FootnoteSeries FootnoteSeriesArray GlobalStyleStorage Incut IncutGroup IncutGroups MainText PageBlackSeparator PageElement PageElements PageSection PageSections PageStream PageStructure RunningTitle RunningTitleSeries RunningTitleSeriesArray RunningTitleSeriesText StreamElementLocationParams TextBarcode TextPicture TextTable TextTableCell		Removed	These objects represented the logical structure of the document and its various parts. Editing the document structure is no longer supported, as its incorrect use could affect the appearance of the exported document, and any text verification or other modifications may be performed via the document API (FRDocument, FRPage and subobjects). The future versions of ABBYY FineReader Engine may provide read-only access to some of the document logical structure.
BorderFlags CaptionPositionEnum DocumentElementTypeEnum FootnoteNumberingTypeEnum FrameHorizontalReferenceEnum FrameVerticalReferenceEnum PageBlackSeparatorRoleEnum PageBlackSeparatorTypeEnum PageElementTypeEnum StreamElementAlignmentEnum StreamTypeEnum TableCellVertAlignmentEnum TextTableSeparatorTypeEnum TextWrappingEnum		Removed	These enumerations were used by the document structure objects that are no longer available.
FRPage	IsEmpty	Behavior changed	This method now provides extended parameters of empty page detection.
	IsEmptyEx	Renamed	This method is now called IsEmpty. The old implementation of the IsEmpty method has been removed.
	Classify ClassifyEx	Removed	Page classification can now be performed by the Classify method of the Model object. It requires as an input parameter a ClassificationObject, which may be created using the IClassificationEngine::CreateObjectFromPage method.
FRDocument	SourceHasTextualContent	Deprecated	This property is now deprecated and will be deleted in future versions. Use the CheckTextLayer method to find out if a file has textual content.

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
DocumentAnalyzer		Removed	The object is obsolete. Its methods were replaced by more efficient methods of the FRDocument and FRPage objects, which do not require you to maintain the DocumentInfo object on all processing stages, or implement the IRecognizedPages interface.
	AddWordsToCacheDictionary AddWordToCacheDictionary CleanCacheDictionary	Removed	Use the IFRPage::AddWordsToCacheDictionary, IFRPage::AddWordToCacheDictionary, IFRPage::CleanCacheDictionary methods for working with cache dictionaries.
	AnalyzePage	Removed	Use the IFRPage::Analyze method instead.
	AnalyzePagesEx	Removed	Use the IFRDocument::Analyze method instead.
	AnalyzeRegion	Removed	Use the IFRPage::AnalyzeRegion method instead.
	AnalyzeTable	Removed	Use the IFRPage::AnalyzeTable method instead.
	AutoCleanRecognizerSession	Removed	Use the IEngine::AutoCleanRecognizerSession property, which works in exactly the same way.
	CleanRecognizerSession	Removed	Use the IEngine::CleanRecognizerSession method, which works in exactly the same way.
	CorrectGeometricalDistortions	Removed	Use the IImageDocument::RemoveGeometricalDistortions method instead.
	DetectOrientation	Removed	Use the IFRPage::DetectOrientation method instead.
	ExtractBarcodes	Removed	Use the IFRPage::ExtractBarcodes method instead.
	FindPageSplitPosition	Removed	Use the IFRPage::FindPageSplitPosition method instead.
	LearnCheckmarks	Removed	Use the IFRPage::LearnCheckmarks method instead.
	PreprocessAnalyzeRecognizePage	Removed	Use the IFRPage::PreprocessAnalyzeRecognize method instead.
	PreprocessAnalyzeRecognizePagesEx	Removed	Use the IFRDocument::Process method instead. It performs full processing of the document, including document synthesis.
	PreprocessPage	Removed	Use the IFRPage::Preprocess method instead.
	PreprocessPagesEx	Removed	Use the IFRDocument::Preprocess method instead.
	RecognizeBlocks	Removed	Use the IFRPage::RecognizeBlocks method instead.
	RecognizeImageAsPlainText	Removed	To recognize an image as plain text create the FRDocument from the image with the help of the IEngine::CreateFRDocumentFromImage method, use the IFRDocument::Process method to recognize the document, then access the IFRDocument::PlainText property.
	RecognizeImageDocumentAsPlainText	Removed	To recognize the page as plain text, use the IFRPage::PreprocessAnalyzeRecognize method, then access the IFRPage::PlainText property.
	RecognizePage	Removed	Use the IFRPage::Recognize method instead.
	RecognizePagesEx	Removed	Use the IFRDocument::Recognize method instead.
Exporter		Removed	The object is obsolete. Its methods were replaced by more efficient methods of the FRDocument and FRPage objects, which do not require you to maintain the DocumentInfo object on all processing stages, or implement the IRecognizedPages interface.
	ExportPage	Removed	Use the IFRPage::Export method instead.
	ExportPagesEx	Removed	Use the IFRDocument::Export method instead.
IDocumentAnalyzerEvents		Removed	This interface is no longer necessary because the object which reported events has been removed. The IFRDocumentEvents and IFRPageEvents interfaces provide similar information on progress and errors for the objects which replaced DocumentAnalyzer.
IExporterEvents		Removed	This interface is no longer necessary because the object which reported events has been removed. The IFRDocumentEvents and IFRPageEvents interfaces provide similar information on progress and errors for the objects which replaced Exporter.
IRecognizedPages		Removed	The methods which required an object of this type have been removed.
FREngineModuleEnum	FREM\_DocumentAnalyzer	Removed	This constant is no longer in use.

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
ObjectsExtractionParams	FlexiFormsDA	Removed	This property is obsolete since FineReader Engine 11. Use the EnableAggressiveTextExtraction property instead.
ObjectsExtractionParams	FullTextIndexDA	Removed	This property is obsolete since FineReader Engine 11. Use the DetectTextOnPictures property of the PageAnalysisParams object instead.
SynthesisParamsForPage	InsertEmptyParagraphsForBigInterlines	Removed	Use the ITextExportParams::RetainLayout property to emulate the original text layout with the help of spaces.
WritingStyleEnum	WS\_Default	Removed	Windows We recommend using WS\_Auto to ensure the best recognition quality. If you need to select the writing style corresponding to the current operating system language, use WS\_DetectByLocale.
RTFExportParams	KeepPages	Removed	Use the KeepPageBreaks property instead.
ParagraphExtractionModeEnum	PEM\_SingleLineParagraphsWithSpaceFormatting	Removed	Use the ITextExportParams::RetainLayout property to emulate the original text appearance with the help of spaces while exporting to TXT format.
PDFEncryptionInfo	UseAES	Removed	Use the EncryptionAlgorithm property to select the encryption type.
RecognizerParams	DetectLanguage	Removed	Use the LanguageDetectionMode property to manage automatic detection of recognition languages.
	ErrorHighlightLevel	Removed	Use the new HighlightSuspiciousCharacters property, which dispenses with various levels of confidence and allows you a simple choice: either highlight uncertainly recognized characters or not. If you need a finer distinction, use the CharConfidence property of the selected CharacterRecognitionVariant, although matching recognition confidences for different characters against the same threshold may not always provide consistent results.
	BalancedMode FastMode	Deprecated	Use the Mode property to set the recognition mode with the RecognitionModeEnum constants (RM\_Normal corresponds to BalancedMode = TRUE and RM\_Fast corresponds to FastMode = TRUE).
AvailableEngineModulesFlags	AEM\_FastMode AEM\_BalancedMode	Deprecated	The modules which used these constants are deprecated.
ErrorHighlightLevelEnum		Removed	The property which used this enumeration has been removed.
PagePreprocessingParams	GeometryCorrectionMode ResolutionCorrectionMode	Renamed, type changed	These properties are now called CorrectGeometry and CorrectResolution, and are of the ThreeStatePropertyValueEnum type. The defaults function as before.
PDFExportFeatures	WriteTaggedPDFMode WriteXmpMetadataMode	Renamed, type changed	These properties are now called WriteTaggedPDF, WriteXmpMetadata, and are of the ThreeStatePropertyValueEnum type. The defaults function as before.
PDFMRCParams	PicturesInBackground	Renamed, type changed	This property is now called ProcessPicturesAsBackground and is of the ThreeStatePropertyValueEnum type. By default, pictures are not treated as part of the background.
GeometryCorrectionModeEnum ResolutionCorrectionModeEnum WriteTaggedPDFModeEnum WriteXmpMetadataModeEnum		Removed	The properties which used these enumerations now have another type.
TextExportParams	RetainLayout	Deprecated	This property is now deprecated and will be deleted in future versions. The same results will be achieved by setting the LayoutRetentionMode property to TXTLRM\_ExactCopy.
PageAnalysisParams	ProhibitModelAnalysis	Removed	This property was already deprecated.
PageAnalysisParams	EnableExhaustiveAnalysisMode	Deprecated	This property is now deprecated and will be deleted in future versions.
BarcodeParams	MinRatioToTextHeight EnableAdvancedExtractionMode IsCode39WithoutAsterisk	Deprecated	These properties are now deprecated and will be deleted in future versions.
MultiProcessingParams	ProcessPdfInOneThread	Deprecated in Windows and Linux	This property is now deprecated and will be deleted in future versions.

| Object/Enumeration | Property/Method/Constant | What has happened? | Comment | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------ | ------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | ClassificationEtalon ClassificationParams ClassificationClass ClassificationClasses ClassificationTrainer ClassificationTrainerError ClassificationTrainerErrors ClassificationTrainerErrorTypeEnum ClassificationModeEnum | | Removed | The old Classification API has been removed. Classification model training is now performed via the [Trainer](/fine-reader/engine/api-reference/classification-related-objects/trainer) object, with the settings specified in [TrainingParams](/fine-reader/engine/api-reference/classification-related-objects/trainingparams) and [ValidationParams](/fine-reader/engine/api-reference/classification-related-objects/validationparams), and the input data provided as [TrainingData](/fine-reader/engine/api-reference/classification-related-objects/trainingdata). Classifying documents or pages is possible via the [Model](/fine-reader/engine/api-reference/classification-related-objects/model) object. Both training and classification require previously turning a document or a page into a [ClassificationObject](/fine-reader/engine/api-reference/classification-related-objects/classificationobject), which can be achieved with the methods of the [ClassificationEngine](/fine-reader/engine/api-reference/classification-related-objects/classificationengine) object. See also [Classification-Related Objects](/fine-reader/engine/api-reference/classification-related-objects) and [Classification](/fine-reader/engine/guided-tour/basic-usage-scenarios-implementation/document-classification) scenario description. |

Object/Enumeration	Property/Method/Constant	What has happened?	Comment
DocumentInfo		Removed	The methods which required an object of this type have been removed.
DocumentInfo	DocumentContentInfo	Removed	The object containing information about the author, keywords, subject and title of the document, can be obtained via the DocumentContentInfo property of the FRDocument object.