Differences between ABBYY FineReader Engine for Windows and Linux

Here you can find the list of differences between ABBYY FineReader Engine 12 for Windows and for Linux.

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 a Java wrapper, so your application needs to be written in C/C++ or Java.
You need to work with string properties using FREngineAllocString and FREngineFreeString functions instead of SysAllocString or SysFreeString.
When loading ABBYY FineReader Engine as an out-of-process server, you must pass NULL for parameters derived from IUnknown. These parameters are commonly used in export methods. To pass the export parameters in an alternative way, create a user profile with the desired settings.
Distribution packages for Windows and Linux platforms are different. See details in ABBYY FineReader Engine Distribution Kit.
Default fonts used for synthesis are different. They are selected from Linux system font set.
IMultiProcessingParams::UseOnlyPhysicalCPUCores property value 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.
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.

The following functionality is not supported:

IEngine::ParentWindow, IEngine::ApplicationTitle
IEngineLoader, InprocLoader, OutprocLoader, IHostProcessControl
WDP, WIC, DjVu input image formats (IFF_WdpBw, IFF_WdpGray, IFF_WdpColor, IFF_Wic, IFF_DjVuBw, IFF_DjVuGray, IFF_DjVuColor in the ImageFileFormatEnum enumeration)
Methods for saving into memory and loading from memory which use HGLOBAL in Windows version:

IEngine::CreateScanManager, ScanManager
IScanCallback
ScanSources, ScanSource, ScanSourceSettings, ScanSourceCapabilities
ScanSourceApiTypeEnum, ScanRotationAngleEnum, ScanPaperSizeEnum, ScanColorModeEnum, ScanCompressionTypeEnum, ScanBrightnessControlEnum, ScanPaperFeedModeEnum, ScanPauseModeEnum, ScanSourceStatusEnum
Scanning license module