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EZTwain Pro User Guide
TWAIN State 7: Transfer In Progress
This is the State while image data is actively being transferred, and just after.  The 
application is required to acknowledge the transfer, which moves the State to either 
6 or 5, depending on whether another transfer is ready.
Page 160
Extract image from pdf in - Select, copy, paste PDF images in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
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EZTwain Pro User Guide
Appendix 1 - History
Please refer to the file History.txt, which is installed as part of the EZTwain Pro 
toolkit.
3.4x
Changes / Corrections:
▪ Appending to PDF files with encryption.
▪ Partial support for images compressed in memory: scanning them, displaying 
them, writing them to disk without decompress/recompress.
▪ Several bugs fixed in DIB_DrawText – wrapping, alignment.
▪ Better error reporting from PDF write errors
▪ Improved speed & capacity for PDF files (~2000 pages)
▪ Removed TWAIN_xx pixel-mask constants, obsolete & confusing.
▪ Delphi declaration file (eztwain.pas) adapted for Delphi 2009/2010
▪ EZTwain Pro ported to VS 2005
New:
▪ in C#: EZTwain.DIB_FromStream, DIB_FromImage▪
▪ optional Save As... button in DIB_View/TWAIN_ViewFile dialog.
▪ Page range selection in print dialog.
▪ DIB_IsCompressed, DIB_Compression
▪ DIB_TextColor, DIB_GetTextColor
▪ DIB_IsValid, DIB_Sobel, DIB_ApplyToneMap8, DIB_FreeArray
▪ DIB_InPlaceRotate90, DIB_Resize
▪ DIB_FromImage for VB.NET
▪ DIB_GetBrightRects
▪ OCR_SetAutoRotatePagesToPDF
▪ PDF_DocumentProperty, PDF_GetDocumentProperty (3.43)
▪ TWAIN_AcquireCompressed
▪ TWAIN_AcquireMultipage
▪ TWAIN_AcquireToArray
▪ TWAIN_IsPaperDetectable
▪ TWAIN_PromptToContinue
▪ TWAIN_RecordError
▪ TWAIN_SetAcquireImageCallback
▪ TWAIN_SetAutoCropOptions, TWAIN_GetAutoCropOptions
▪ New AutoCrop option: AUTOCROP_CHECK
▪ TWAIN_SetStopOnEmpty/TWAIN_GetStopOnEmpty
Page 161
VB.NET PDF Text Extract Library: extract text content from PDF
Extract highlighted text out of PDF document. Image text extraction control provides text extraction from PDF images and image files.
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C# PDF Text Extract Library: extract text content from PDF file in
Ability to extract highlighted text out of PDF document. Image text extraction control provides text extraction from PDF images and image files.
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EZTwain Pro User Guide
3.30
Changes / Corrections:
New:
▪ optional Print... button in DIB_View/TWAIN_ViewFile dialog
DIB_PrintArray , DIB_SetNextPrintJobPageCount 
▪ Writing and Reading encrypted (password-protected) PDFs
PDF_SetOpenPassword, PDF_SetUserPassword, PDF_SetOwnerPassword,
PDF_SetPermissions / PDF_GetPermissions
▪ Writing PDF files that comply with PDF/A-1(b) - ISO 19005-1:2005
PDF_SetPDFACompliance / PDF_GetPDFACompliance.
▪ OCR_SetLineBreak
▪ DIB_LoadArrayFromBuffer
DIB_LoadPageFromBuffer
DIB_LoadArrayFromFilename
DIB_LoadPagesFromFilename
DIB_PageCountOfBuffer / DIB_BufferPageCount
DIB_InUseCount
DIB_MeanFilter
DIB_XResolutionInt, DIB_YResolutionInt
▪ UPLOAD_SetProgressCallback
▪ TWAIN_AcquireArray
TWAIN_AcquireImagesToFiles
TWAIN_AcquirePagesToFiles
TWAIN_PromptForOpenFilename
TWAIN_SetLogName
▪ CONTAINER_GetItemFrame
CONTAINER_MinValueInt, CONTAINER_MaxValueInt, CONTAINER_StepSizeInt
CONTAINER_CurrentValueInt, CONTAINER_DefaultValueInt, 
CONTAINER_ContainsValueInt, CONTAINER_FindValueInt, 
CONTAINER_SetItemInt
Page 162
C# PDF insert image Library: insert images into PDF in C#.net, ASP
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VB.NET PDF - Add Image to PDF Page in VB.NET. Insert Image to PDF Page Using VB. Add necessary references: RasterEdge.Imaging.Basic.dll.
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EZTwain Pro User Guide
3.20
Changes / Corrections:
▪ Recognize Window Vista
▪ Read yet another variant of TIFF – from Kodak xCVS software.
New:
▪ DIB_PrintFile/TWAIN_PrintFile (build 69)
▪ OCR functions – using 3
rd
party Transym TOCR engine:
OCR_IsAvailable, OCR_Version, OCR_IsEngineAvailable, OCR_SelectEngine, 
OCR_SelectDefaultEngine, OCR_SelectedEngine, OCR_EngineName, 
OCR_RecognizeDib, OCR_RecognizeDibZone (build 68), OCR_Text, 
OCR_GetText, OCR_TextLength, OCR_TextOrientation, OCR_GetCharPositions, 
OCR_GetCharSizes. OCR_WritePage, OCR_ClearText, OCR_SetEngineKey
▪ UPLOAD_FilesToURL, UPLOAD_MaxFiles, UPLOAD_AddHeader, 
UPLOAD_EnableProgressBar, UPLOAD_IsEnabledProgressBar (build 36)
▪ Functions to write text into PDF files: PDF_DrawText, PDF_SetTextVisible, 
PDF_DrawInvisibleText
▪ New aliases for existing functions: PDF_SetTitle, PDF_SetAuthor, 
PDF_SetSubject, PDF_SetKeywords, PDF_SetCreator, PDF_SetProducer.
▪ New post-processing mode: TWAIN_SetAutoOCR/TWAIN_GetAutoOCR
▪ TWAIN_FormatVersion (build 11)
▪ DIB_PhysicalWidth, DIB_PhysicalHeight (build 13)
▪ Support for Extended Image Info (build 14)
TWAIN_IsExtendedInfoSupported
TWAIN_EnableExtendedInfo
TWAIN_IsExtendedInfoEnabled
TWAIN_DisableExtendedInfo
TWAIN_ExtendedInfoItemCount
TWAIN_ExtendedInfoItemType
TWAIN_ExtendedInfoInt
TWAIN_ExtendedInfoFloat
TWAIN_GetExtendedInfoString
TWAIN_ExtendedInfoString
TWAIN_GetExtendedInfoFrame
▪ BARCODE_TypeName (build 20)
▪ BARCODE_SetZone, BARCODE_NoZone (build 68)
▪ TWAIN_GetPaperDimensions (build 22)
▪ PDF_SelectPageSize (build 23)
▪ TWAIN_SingleMachineLicense (build 23)
▪ Definition of 'saturation' component changed slightly to give more intuitive 
(low) values for dark pixels (build 24)
▪ DIB_Avg (build 24)
▪ All file-writing functions create folders as needed (build 27)
▪ New installer (Inno Setup) with option to install shared DLLs only (build 27)
▪ TWAIN_IsMultipageFileOpen (build 41)
3.10
Changes / Corrections:
▪ Improved behavior of DIB_AutoContrast
▪ DIB_WriteRowChannel - Interpretation of nChannel parameter changed.
Page 163
C# Create PDF from images Library to convert Jpeg, png images to
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C# PDF Page Extract Library: copy, paste, cut PDF pages in C#.net
Page: Extract, Copy and Paste PDF Pages. Easy to Use C# Code to Extract PDF Pages, Copy Pages from One PDF File and Paste into Others in C#.NET Program.
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EZTwain Pro User Guide
▪ Explicit message when license key is delivered too late in program execution.
▪ Functions that return Strings can now be called directly from Visual Basic.
▪ When writing a PDF to a memory buffer, no temp file is created on disk.
New:
▪ UPLOAD_DibToURL, UPLOAD_DibsToURL, UPLOAD_DibsSeparatelyToURL
UPLOAD_Response, UPLOAD_GetResponse, UPLOAD_IsAvailable, 
UPLOAD_Version, UPLOAD_AddFormField.
▪ Support for Black Ice barcode recognition engine (build 25)
▪ Support for LeadTools barcode recognition engine (build 28)
▪ BARCODE_ReadableCodes (build 28)
▪ TWAIN_Shutdown
▪ TWAIN_ReportLeaks
▪ DIB_ToImage (as an alias for DibToImage) in VB.NET
▪ DIB_WriteArrayToFilename
▪ DIB_WriteArrayToBuffer
▪ DIB_ReadRowChannel
▪ DIB_Resample
▪ DIB_DrawOnWindow
▪ DIB_DeskewAngle
▪ TWAIN_LogFileName
▪ TWAIN_SetBlankPageMode/TWAIN_GetBlankPageMode
TWAIN_SetBlankPageThreshold/TWAIN_GetBlankPageThreshold
TWAIN_SetAutoCrop/TWAIN_GetAutoCrop
TWAIN_SetAutoContrast/TWAIN_GetAutoContrast
▪ DIB_SetViewOption/TWAIN_SetViewOption
DIB_ViewClose/TWAIN_ViewClose
DIB_IsViewOpen/TWAIN_IsViewOpen
DIB_SetViewImage
▪ TWAIN_GetTiffTagAscii
▪ TWAIN_SetOutputPageCount, and improved TIFF Class F support.
3.09
Changes / Corrections:
▪ Many function parameters and return values that are Boolean (True or False) 
are now declared as booleans in languages where this is possible, particularly 
Delphi, Clarion, C#, and VB.NET.  This may cause compile errors in existing 
code but they are easy and local to correct.
▪ DIB_LoadFromFilename, TWAIN_LoadNativeFromFilename, and 
DIB_GetFilePageCount all handle EZTwain-generated PDF files.
▪ DIB_Blt now converts source pixels to destination format as needed.
▪ DIB_Blt/DIB_RegionCopy: Several bugs for 1-bit B&W images are corrected.
▪ Statically linkable library EZT3MT.LIB added to toolkit.
▪ PDF files of ~7000 pages can now be written (previous limit was ~1000 pages)
▪ PDF files can be appended to!  This is officially supported only for EZTwain-
written PDF files, contact Dosadi Support for other cases.
(See TWAIN_SetFileAppendFlag/TWAIN_GetFileAppendFlag)
▪ Images with x-resolution different from y-resolution (faxes for example) are 
now displayed correctly and rendered to thumbnails correctly.
▪ Documentation added for DIB_SimpleThreshold, DIB_SmartThreshold
New:
Page 164
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EZTwain Pro User Guide
▪ BARCODE_IsAvailable
BARCODE_Version
BARCODE_Recognize
BARCODE_IsEngineAvailable
BARCODE_SelectEngine
BARCODE_SelectedEngine
BARCODE_SetDirectionFlags
BARCODE_GetDirectionFlags
BARCODE_AvailableDirectionFlags
BARCODE_Text / BARCODE_GetText
BARCODE_Type
BARCODE_GetRect
▪ TWAIN_ExtensionFromFormat
▪ TWAIN_SetAutoDeskew, TWAIN_GetAutoDeskew
▪ TWAIN_LastOutputFile
▪ TWAIN_PagesInFile - same as DIB_GetFilePageCount, just easier to remember.
▪ TWAIN_SetTiffTagShort, TWAIN_SetTiffTagRational, 
TWAIN_SetTiffTagRationalArray, TWAIN_SetTiffTagBytes
▪ DIB_AutoDeskew - automatically deskew an image.
▪ DIB_GetCropRect - return the crop rectangle found by the AutoCrop algorithm.
▪ DIB_BitsPerSample, DIB_SamplesPerPixel - more image queries.
▪ DIB_IsVanilla, DIB_IsChocolate - queries about how black & white are coded.
▪ DIB_LoadFromBuffer, DIB_LoadPageFromBuffer, DIB_FormatOfBuffer - 
functions that read an image from memory instead of from a disk file.
▪ DIB_WriteToBuffer - save an image into a memory buffer.
▪ DIB_AutoContrast (beta) - automatically adjust contrast of an image.
▪ DIB_Create - create an image of specified pixel type.
▪ DIB_SpecifyPrinter, DIB_EnumeratePrinters, DIB_GetPrinterName
▪ DIB_SetPrintFit/DIB_GetPrintToFit - control scale-to-fit during printing.
3.08
Corrected:
▪ The Trial License would sometimes not initialize, or would expire immediately.
▪ Incorrect declaration of several string-valued functions in .NET languages.
New:
▪ TWAIN_SetCapability, TWAIN_SetCapString - for setting custom capabilities.
▪ TWAIN_SetTiffTagLong, TWAIN_SetTiffTagString, TWAIN_SetTiffTagDouble, 
TWAIN_ResetTiffTags - functions for setting specific tag values in TIFF files.
▪ TWAIN_SetPdfTitle, TWAIN_SetPdfAuthor, TWAIN_SetPdfSubject, 
TWAIN_SetPdfKeywords, TWAIN_SetPdfCreator, TWAIN_SetPdfProducer - 
functions for setting specific summary (DID) fields in PDF files.
▪ TWAIN_SetAutoNegate/TWAIN_GetAutoNegate - control ‘autonegate’ of 
excessively black scans.
▪ DIB_Thumbnail - creates a thumbnail of any image in memory.
▪ DIB_FromClipboard, DIB_CanGetFromClipboard - for implementing ‘Paste’.
▪ DIB_ComponentCopy - extract one channel from RGB or CMY(K) image.
▪ DIB_AdjustBC - change brightness and/or contrast of an image.
▪ DIB_ConvertToFormat - more general image format conversion, including 
conversions to and from 4-bit grayscale.
Page 165
EZTwain Pro User Guide
3.07
Corrected:
▪ With Visioneer Strobe XP450, 2
nd
and later pages blank or garbage - FIXED.
▪ CPU usage goes to 100% sometimes on 2
nd
batch - FIXED.
▪ Orientation tag in TIFF files correctly interpreted.
New:
▪ Clarion binding.
▪ TWAIN_SetLogFolder
▪ TWAIN_OrganizationLicense (allowing embedded In-House App Licenses)
▪ TWAIN_ApplicationLicense
▪ TWAIN_ViewFile
▪ DIB_View
▪ DIB_ScaleToGray, DIB_Posterize, DIB_GetHistogram.
▪ DIB_Convolve, DIB_Correlate, DIB_CrossCorrelate, DIB_MedianFilter.
▪ DIB_Darkness
▪ DIB_PrintJobBegin, DIB_PrintJobEnd, DIB_PrintPage
▪ Streaming buffered memory transfers: TWAIN_BeginAcquireMemory, 
TWAIN_AcquireMemoryBlock, TWAIN_EndAcquireMemory.
▪ TWAIN_WaitForImage
▪”.tiff” and “.jpeg” recognized as standard file extensions when saving files.
▪ PDF files now support indexed-color (‘palette color’) images.
▪ PDF and JPEG files now support CMY/CMYK images.
▪ DCX multipage file support - .dcx extension recognized, DIB_WriteToDcx
▪ TWAIN_DoSettingsDialog.
▪ TWAIN_EnableSourceUiOnly
▪ TWAIN_GetCustomDataToFile, TWAIN_SetCustomDataFromFile
▪ TWAIN_SetImageReadyTimeout
▪ TWAIN_IsFileExtensionAvailable, TWAIN_FormatFromExtension
▪ TWAIN_SetGrayResponse, TWAIN_SetColorResponse
▪ TWAIN_ResetGrayResponse, TWAIN_ResetColorResponse
▪ TWAIN_SetCapBool
▪ CONTAINER_StringValue/CONTAINER_GetStringValue
▪ BARCODE_IsAvailable, BARCODE_Recognize, BARCODE_Text, 
BARCODE_GetText, BARCODE_Type, BARCODE_GetRect, 
BARCODE_SetDirectionFlags, BARCODE_GetDirectionFlags - (BETA) pass-thru 
to Axtel barcode engine.
3.06
Corrected:
▪ AcquireToFilename and Acquire were ignoring SetXferMech
▪ Conversion from RGB to 256-color made patches and ‘sprays’ sometimes.
▪ DIB_RegionCopy wasn’t copying DPI information.
▪ Distorted image when scanning native mode grayscale images to JPEG, with 
certain scanners
New:
▪ Code Wizard.
▪ Reversed images from some scanners are detected and auto-reversed.
▪ TWAIN_SetRegion, TWAIN_ResetRegion.
▪ TWAIN_SetTiffImageDescription, TWAIN_SetTiffDocumentName.
▪ LZW compression enabled in TIFF files, for reading and writing.
Page 166
EZTwain Pro User Guide
▪ GIF now uses standard LZW compression (was using RLE.)
▪ DIB_DrawLine
3.05
Corrected:
▪ TWAIN_AcquireMultipageFile had a serious memory leak in the version 3.04!
▪ The C# and VB.NET wrappers have been improved.
(‘StringBuilder’ result parameters were passed incorrectly ByRef.)
▪ Writing high-density images to TIFF could cause “Rows Per Strip” warning.
New:
▪ Individual pages from a multipage TIFF file can now be loaded into memory 
using DIB_SelectPageToLoad, DIB_GetFilePageCount, DIB_LoadPage.
▪ Scans and images can now be appended to existing TIFF files, using 
TWAIN_SetFileAppendFlag/TWAIN_GetFileAppendFlag
▪ 16-bit grayscale and 48-bit RGB images can be scanned from capable scanners 
using TWAIN_AcquireMemory, and the resulting DIB can be saved in TIFF 
format at full depth.
▪ C# and VB.NET sample applications are included in the toolkit.
▪ TWAIN_SetPaperSize is much ‘smarter’ and will produce the desired result on 
many more scanners.
▪ More detailed error codes are available from TWAIN_LastErrorCode, especially 
after a file read or write has failed.
▪ DIB_FormatOfFile/TWAIN_FormatOfFile.
3.04
Configuration change:
▪ EZMultipage.dll has been removed, code folded into EZTwain3.dll – if you were 
redistributing this file, please delete it from your distribution.
Corrected:
▪ DIB_DrawText had no effect on some systems.
▪ TIFF files were 'big-endian'.
▪ DIB_ToDibSection and DIB_ToPicture did not free the input DIB.
New:
▪ TWAIN_MultipageCount
▪ DIB_ConvertToPixelType
▪ C# and VB.NET bindings
▪ Perl binding
▪ DIB_DrawText uses anti-aliasing in grayscale and RGB images.
▪ TWAIN_WriteToLog
3.03
3.03 was primarily a ‘tune-up’ release: Reduced need to load EZTiff.dll, better 
error diagnosis when there is a licensing error, better logging to the logfile, and 
similar internal improvements.
Corrected:
▪ A 'cancel' return from Enabling a device could cause an inappropriate error box.
▪ Some devices return 0 resolution in the transferred image - EZTwain now 
obtains the correct resolution using IMAGEINFO.
Page 167
EZTwain Pro User Guide
New:
▪ JPEG compression as an option for TIFF files.  Sometimes called JPEG-in-TIFF, 
this applies only to continuous-tone images in 8-bit grayscale and 24-bit RGB 
or CMYK.  See TWAIN_SetTiffCompression/TWAIN_GetTiffCompression for more 
details.
3.02
Corrected:
▪ PDF file scaling issues have been corrected – PDF files are generated at true 
physical size if created from images that contain resolution (DPI) information.
▪ Bugs in the following functions:  DIB_RegionCopy, DIB_Fill, DIB_Blt, 
DIB_ScaledCopy, DIB_DrawText.
New:
▪ DIB_ToPicture and DIB_FromPicture (p. 51), specifically for VB developers.
▪ DIB_ToDibSection and DIB_FromBitmap (p. 49) which helps people working 
with the native Windows graphics API, and with Delphi TBitmaps, among 
others.
▪ TWAIN_SetTiffStripSize (p. Error: Reference source not found)– Special setting 
to help achieve TIFF compatibility with certain persnickity TIFF readers.
▪ TWAIN_SetTiffCompression (p. 97) – To select from the various compression 
algorithms available when writing TIFF files.
Page 168
EZTwain Pro User Guide
Appendix 2 - Working with Containers
Theory
Containers are the currency of TWAIN settings.  TWAIN devices have dozens, 
sometimes hundreds of properties that can be queried and set: Is there paper in the 
feeder, resolution to use for the next scan, the serial number of the device.  TWAIN 
calls these properties capabilities, and capability values move back and forth 
between application and TWAIN device in packages called containers.  TWAIN calls 
this exchange capability negotiation.
Because it is necessary for the application and device to communicate not just the 
current value of a capability, but also its set of possible values, containers are quite 
rich and complex.
Advisory: There is no way to talk about containers in TWAIN without introducing a 
lot of terms and concepts.  Before reading the following, we recommend you open 
our Twirl TWAIN Probe, included in the EZTwain Pro toolkit.  It can examine any 
TWAIN device on your computer and display its capabilities.  You can select any 
capability and Twirl will describe the containers that are returned by that capability. 
Seeing how containers are actually used by your specific TWAIN device may make 
the following more comprehensible.
Page 169
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