ABBYY FRE for Windows vs. Linux

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Differences

• While the ABBYY FineReader Engine for Windows API conforms to the COM standard and can be used in any development tool supporting COM, the Linux version provides only C/C++ native API and an Objective-C wrapper, so your application needs to be written in C/C++ or Objective-C.
• You need to work with string properties using FREngineAllocString and FREngineFreeString functions instead of SysAllocString or SysFreeString.
• Distribution packages for Windows and Kinux platforms are different. See details in ABBYY FineReader Engine Distribution Kit.
• The IsSharedCPUCoresMode parameter of the InitializeEngine function and SetCurrentLicense method is ignored.
• The IEngine::OpenImageFileFromMemory, IFRDocument::AddImageFileFromMemory methods receive two parameters instead of one HGLOBAL handle — a pointer to the memory block and an __int64 variable equal to image size.
• Image documents and page layouts are always unloaded to disk and cannot be kept in memory only:
  • IFRDocument::PageFlushingPolicy property value is ignored
• The methods working with memory image formats (Raw, Bitmap, DIB) are not implemented: IImage::EstimateBitmapSize, IImage::GetBitmap, IEngine::OpenBitmap, IEngine::OpenBitmapBits, IEngine::OpenDib IEngine::PrepareBitmap, IEngine::PrepareBitmapBits, IEngine::PrepareDib, ITrainingImage::SetBitmapBits.

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Unsupported functionality

• IEngine::ParentWindow, IEngine::ApplicationTitle
• IEngineLoader, InprocLoader, OutprocLoader, IHostProcessControl
• Parallel processing (IEngine::MultiProcessingParams, MultiProcessingParams, MultiProcessingModeEnum, IParallelProcessingCallback), FineReader Engine Processor module (FREngineModuleEnum::FREM_FREngineProcessor)
• Batch Processor and related interfaces (BatchProcessor, IImageSource, IFileAdapter, IAsyncProcessingCallback)
• WDP, WIC, DjVu input image formats (IFF_WdpBw, IFF_WdpGray, IFF_WdpColor, IFF_Wic, IFF_DjVuBw, IFF_DjVuGray, IFF_DjVuColor in the ImageFileFormatEnum enumeration)
• Opening Office formats (OfficeConversionSettings, OfficeConverters, OfficeConvertersTypeEnum, IPrepareImageMode::OfficeConversionSettings, Opening Office Formats module)
• Methods for saving into memory and loading from memory which use HGLOBAL in Windows version:
  • SaveToMemory, LoadFromMemory methods of so-called persistent objects
  • IImageDocument::SaveToMemory, IEngine::LoadImageDocFromMemory methods
  • IPDFAttachments::AddFromMemory, IPDFAttachment::SaveToMemory
• Scanning:
  • IEngine::CreateScanManager, ScanManager
  • IScanCallback
  • ScanSources, ScanSource, ScanSourceSettings, ScanSourceCapabilities
  • ScanSourceApiTypeEnum, ScanRotationAngleEnum, ScanPaperSizeEnum, ScanColorModeEnum, ScanCompressionTypeEnum, ScanBrightnessControlEnum, ScanPaperFeedModeEnum, ScanPauseModeEnum, ScanSourceStatusEnum
  • Scanning license module
• Network Licensing service:
  • ILicensingConnectionRecoveryCallback
  • IEngine::SetLicensingConnectionRecoveryCallback
  • IEngine::RestartLicensing
• IDictionary::Edit
• IPrepareImageMode::RasterizeFreeText
• Pattern training GUI:
  • IEngine::EditUserPattern
  • IRecognizerParams::TrainUserPatterns
  • UserPatternsTraining license module
• Visual Components and related FineReader Engine API:
  • autoanalysis blocks (IAutoAnalysisBlock, BlockTypeEnum::BT_AutoAnalysis)
  • ILayout::VisualBlocks
  • AvailableVisualComponentsFlags and ILicense::AvailableVisualComponents
• Special predefined languages are not currently available

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See also