Convert PDF to All with OCR engine in C#
Since version 7.0, PDF Focus .Net can work with OCR. To perform OCR we'll use free OCR library by
Nicomsoft (https://www.nicomsoft.com).
The library is freeware and can be used in commercial application.
You need download Nicomsoft OCR SDK from: free_NSOCR_v70_build885_full.exe
Further install it on your PC or server-side.
Notice: Please make sure, that you have installed this package (Nicomsoft OCR SDK) on your computer. And also, when creating your solution, you must place the file "NSOCR.cs" from C:\Program Files (x86)\Nicomsoft OCR\Samples in the directory of your solution. After copying "NSOCR.cs", there will be no errors with the "using NSOCR_NameSpace;".
How to use SautinSoft.PdfFocus with Optical Character Recognition (OCR).
Complete code
//A C# wrapper class for NSOCR.dll functions (calling NSOCR API via platform invoke)
//******************************************************************************
// Nicomsoft OCR DLL interface
// Copyright (c) 2010-2016 Nicomsoft
// Copyright (c) 2010-2016 Michael Kapustin
// www.nsocr.com
//******************************************************************************
using System;
using System.Text;
using System.Runtime.InteropServices;
namespace NSOCR_NameSpace
{
public class TNSOCR
{
//// Error codes
public const int ERROR_FIRST = 0x70000000;
public const int ERROR_FILENOTFOUND = 0x70000001;
public const int ERROR_LOADFILE = 0x70000002;
public const int ERROR_SAVEFILE = 0x70000003;
public const int ERROR_MISSEDIMGLOADER = 0x70000004;
public const int ERROR_OPTIONNOTFOUND = 0x70000005;
public const int ERROR_NOBLOCKS = 0x70000006;
public const int ERROR_BLOCKNOTFOUND = 0x70000007;
public const int ERROR_INVALIDINDEX = 0x70000008;
public const int ERROR_INVALIDPARAMETER = 0x70000009;
public const int ERROR_FAILED = 0x7000000A;
public const int ERROR_INVALIDBLOCKTYPE = 0x7000000B;
public const int ERROR_EMPTYTEXT = 0x7000000D;
public const int ERROR_LOADINGDICTIONARY = 0x7000000E;
public const int ERROR_LOADCHARBASE = 0x7000000F;
public const int ERROR_NOMEMORY = 0x70000010;
public const int ERROR_CANNOTLOADGS = 0x70000011;
public const int ERROR_CANNOTPROCESSPDF = 0x70000012;
public const int ERROR_NOIMAGE = 0x70000013;
public const int ERROR_MISSEDSTEP = 0x70000014;
public const int ERROR_OUTOFIMAGE = 0x70000015;
public const int ERROR_EXCEPTION = 0x70000016;
public const int ERROR_NOTALLOWED = 0x70000017;
public const int ERROR_NODEFAULTDEVICE = 0x70000018;
public const int ERROR_NOTAPPLICABLE = 0x70000019;
public const int ERROR_MISSEDBARCODEDLL = 0x7000001A;
public const int ERROR_PENDING = 0x7000001B;
public const int ERROR_OPERATIONCANCELLED = 0x7000001C;
public const int ERROR_TOOMANYLANGUAGES = 0x7000001D;
public const int ERROR_OPERATIONTIMEOUT = 0x7000001E;
public const int ERROR_LOAD_ASIAN_MODULE = 0x7000001F;
public const int ERROR_LOAD_ASIAN_LANG = 0x70000020;
public const int ERROR_INVALIDOBJECT = 0x70010000;
public const int ERROR_TOOMANYOBJECTS = 0x70010001;
public const int ERROR_DLLNOTLOADED = 0x70010002;
public const int ERROR_DEMO = 0x70010003;
////Block type
public const int BT_DEFAULT = 0;
public const int BT_OCRTEXT = 1; //machine-printed text
public const int BT_ICRDIGIT = 2; //handwritten digits
public const int BT_CLEAR = 3;
public const int BT_PICTURE = 4;
public const int BT_ZONING = 5;
public const int BT_OCRDIGIT = 6; //machine-printed digits
public const int BT_BARCODE = 7;
public const int BT_TABLE = 8;
public const int BT_MRZ = 9;
////Constants for Img_LoadBmpData function
public const int BMP_24BIT = 0x00;
public const int BMP_8BIT = 0x01;
public const int BMP_1BIT = 0x02;
public const int BMP_32BIT = 0x03;
public const int BMP_BOTTOMTOP = 0x100;
////Constants for Img_GetImgText, Blk_GetText and Svr_AddPage functions
public const int FMT_EDITCOPY = 0x00;
public const int FMT_EXACTCOPY = 0x01;
//for Img_OCR
public const int OCRSTEP_FIRST = 0x00; //first step
public const int OCRSTEP_PREFILTERS = 0x10; //filters before binarizing: scaling, invert, rotate etc
public const int OCRSTEP_BINARIZE = 0x20; //binarize
public const int OCRSTEP_POSTFILTERS = 0x50; //bin garbage filter etc
public const int OCRSTEP_REMOVELINES = 0x60; //find and remove lines
public const int OCRSTEP_ZONING = 0x70; //analyze page layout
public const int OCRSTEP_OCR = 0x80; //ocr itself
public const int OCRSTEP_LAST = 0xFF; //last step
//for Img_OCR, "Flags" parameter
public const int OCRFLAG_NONE = 0x00; //default mode (blocking)
public const int OCRFLAG_THREAD = 0x01; //non-blocking mode
public const int OCRFLAG_GETRESULT = 0x02; //get result for non-blocking mode
public const int OCRFLAG_GETPROGRESS = 0x03; //get progress
public const int OCRFLAG_CANCEL = 0x04; //cancel ocr
//for Img_DrawToDC and Img_GetBmpData
public const int DRAW_NORMAL = 0x00;
public const int DRAW_BINARY = 0x01;
public const int DRAW_GETBPP = 0x100;
//values for Blk_Inversion function
public const int BLK_INVERSE_GET = -1;
public const int BLK_INVERSE_SET0 = 0;
public const int BLK_INVERSE_SET1 = 1;
public const int BLK_INVERSE_DETECT = 0x100;
//for Blk_Rotation function
public const int BLK_ROTATE_GET = -1;
public const int BLK_ROTATE_NONE = 0x00;
public const int BLK_ROTATE_90 = 0x01;
public const int BLK_ROTATE_180 = 0x02;
public const int BLK_ROTATE_270 = 0x03;
public const int BLK_ROTATE_ANGLE = 0x100000;
public const int BLK_ROTATE_DETECT = 0x100;
//for Blk_Mirror function
public const int BLK_MIRROR_GET = -1;
public const int BLK_MIRROR_NONE = 0x00;
public const int BLK_MIRROR_H = 0x01;
public const int BLK_MIRROR_V = 0x02;
//for Svr_Create function
public const int SVR_FORMAT_PDF = 0x01;
public const int SVR_FORMAT_RTF = 0x02;
public const int SVR_FORMAT_TXT_ASCII = 0x03;
public const int SVR_FORMAT_TXT_UNICODE = 0x04;
public const int SVR_FORMAT_XML = 0x05;
public const int SVR_FORMAT_PDFA = 0x06;
//for Scan_Enumerate function
public const int SCAN_GETDEFAULTDEVICE = 0x01;
public const int SCAN_SETDEFAULTDEVICE = 0x100;
//for Scan_ScanToImg and Scan_ScanToFile functions
public const int SCAN_NOUI = 0x01;
public const int SCAN_SOURCEADF = 0x02;
public const int SCAN_SOURCEAUTO = 0x04;
public const int SCAN_DONTCLOSEDS = 0x08;
public const int SCAN_FILE_SEPARATE = 0x10;
//for Blk_GetWordFontStyle function
public const int FONT_STYLE_UNDERLINED = 0x01;
public const int FONT_STYLE_STRIKED = 0x02;
public const int FONT_STYLE_BOLD = 0x04;
public const int FONT_STYLE_ITALIC = 0x08;
//for Img_GetProperty function, PropertyID parameter
public const int IMG_PROP_DPIX = 0x01; //original DPI
public const int IMG_PROP_DPIY = 0x02;
public const int IMG_PROP_BPP = 0x03; //color depth
public const int IMG_PROP_WIDTH = 0x04; //original width
public const int IMG_PROP_HEIGHT = 0x05; //original height
public const int IMG_PROP_INVERTED = 0x06; //image inversion flag after OCR_STEP_PREFILTERS step
public const int IMG_PROP_SKEW = 0x07; //image skew angle after OCR_STEP_PREFILTERS step, multiplied by 1000
public const int IMG_PROP_SCALE = 0x08; //image scale factor after OCR_STEP_PREFILTERS step, multiplied by 1000
public const int IMG_PROP_PAGEINDEX = 0x09; //image page index
//for "Blk_SetWordRegEx" function
public const int REGEX_SET = 0x00;
public const int REGEX_CLEAR = 0x01;
public const int REGEX_CLEAR_ALL = 0x02;
public const int REGEX_DISABLE_DICT = 0x04;
public const int REGEX_CHECK = 0x08;
//for Svr_SetDocumentInfo function
public const int INFO_PDF_AUTHOR = 0x01;
public const int INFO_PDF_CREATOR = 0x02;
public const int INFO_PDF_PRODUCER = 0x03;
public const int INFO_PDF_TITLE = 0x04;
public const int INFO_PDF_SUBJECT = 0x05;
public const int INFO_PDF_KEYWORDS = 0x06;
//for Blk_GetBarcodeType function
public const int BARCODE_TYPE_EAN8 = 0x01;
public const int BARCODE_TYPE_UPCE = 0x02;
public const int BARCODE_TYPE_ISBN10 = 0x03;
public const int BARCODE_TYPE_UPCA = 0x04;
public const int BARCODE_TYPE_EAN13 = 0x05;
public const int BARCODE_TYPE_ISBN13 = 0x06;
public const int BARCODE_TYPE_ZBAR_I25 = 0x07;
public const int BARCODE_TYPE_CODE39 = 0x08;
public const int BARCODE_TYPE_QRCODE = 0x09;
public const int BARCODE_TYPE_CODE128 = 0x0A;
//for "BarCode/TypesMask" configuration option
public const int BARCODE_TYPE_MASK_EAN8 = 0x01;
public const int BARCODE_TYPE_MASK_UPCE = 0x02;
public const int BARCODE_TYPE_MASK_ISBN10 = 0x04;
public const int BARCODE_TYPE_MASK_UPCA = 0x08;
public const int BARCODE_TYPE_MASK_EAN13 = 0x10;
public const int BARCODE_TYPE_MASK_ISBN13 = 0x20;
public const int BARCODE_TYPE_MASK_ZBAR_I25 = 0x40;
public const int BARCODE_TYPE_MASK_CODE39 = 0x80;
public const int BARCODE_TYPE_MASK_QRCODE = 0x100;
public const int BARCODE_TYPE_MASK_CODE128 = 0x200;
//for Img_SaveToFile function
public const int IMG_FORMAT_BMP = 0;
public const int IMG_FORMAT_JPEG = 2;
public const int IMG_FORMAT_PNG = 13;
public const int IMG_FORMAT_TIFF = 18;
public const int IMG_FORMAT_FLAG_BINARIZED = 0x100;
////////////////////////////////////////////////////////////////////
//use appropriate path, otherwise you will get "BadImageFormatException"
//for x86
public const string LIBNAME = @"..\..\OCR Lib\Bin\NSOCR.dll"; //IMPORTANT: CORRECT PATH TO X86 NSOCR.DLL
//for x64
//public const string LIBNAME = @"..\..\OCR Lib\Bin64\NSOCR.dll"; //IMPORTANT: CORRECT PATH TO X64 NSOCR.DLL
[DllImport(LIBNAME)]
public static extern int Engine_Initialize();
[DllImport(LIBNAME)]
public static extern int Engine_InitializeAdvanced(out int CfgObj, out int OcrObj, out int ImgObj);
[DllImport(LIBNAME)]
public static extern int Engine_Uninitialize();
[DllImport(LIBNAME)]
public static extern int Engine_SetDataDirectory([MarshalAs(UnmanagedType.LPWStr)] string DirectoryPath);
[DllImport(LIBNAME)]
public static extern int Engine_GetVersion([MarshalAs(UnmanagedType.LPWStr)] StringBuilder OptionValue);
[DllImport(LIBNAME)]
public static extern int Engine_SetLicenseKey([MarshalAs(UnmanagedType.LPWStr)] string LicenseKey);
////////
[DllImport(LIBNAME)]
public static extern int Cfg_Create(out int CfgObj);
[DllImport(LIBNAME)]
public static extern int Cfg_Destroy(int CfgObj);
[DllImport(LIBNAME)]
public static extern int Cfg_LoadOptions(int CfgObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
[DllImport(LIBNAME)]
public static extern int Cfg_SaveOptions(int CfgObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
[DllImport(LIBNAME)]
public static extern int Cfg_LoadOptionsFromString(int CfgObj, [MarshalAs(UnmanagedType.LPWStr)] string XMLString);
[DllImport(LIBNAME)]
public static extern int Cfg_SaveOptionsToString(int CfgObj, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder XMLString, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Cfg_GetOption(int CfgObj, int BlockType, [MarshalAs(UnmanagedType.LPWStr)] string OptionPath, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder OptionValue, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Cfg_SetOption(int CfgObj, int BlockType, [MarshalAs(UnmanagedType.LPWStr)] string OptionPath, [MarshalAs(UnmanagedType.LPWStr)] string OptionValue);
[DllImport(LIBNAME)]
public static extern int Cfg_DeleteOption(int CfgObj, int BlockType, [MarshalAs(UnmanagedType.LPWStr)] string OptionPath);
////////
[DllImport(LIBNAME)]
public static extern int Ocr_Create(int CfgObj, out int OcrObj);
[DllImport(LIBNAME)]
public static extern int Ocr_Destroy(int OcrObj);
[DllImport(LIBNAME)]
public static extern int Ocr_Destroy(int ImgObj, int SvrObj, int PageIndexStart, int PageIndexEnd, int OcrObjCnt, int Flags);
[DllImport(LIBNAME)]
public static extern int Ocr_ProcessPages(int ImgObj, int SvrObj, int PageIndexStart, int PageIndexEnd, int OcrObjCnt, int Flags);
////////
[DllImport(LIBNAME)]
public static extern int Img_Create(int OcrObj, out int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_Destroy(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_LoadFile(int ImgObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
[DllImport(LIBNAME)]
public static extern int Img_LoadFromMemory(int ImgObj, IntPtr Bytes, int DataSize);
[DllImport(LIBNAME)]
public static extern int Img_LoadBmpData(int ImgObj, IntPtr Bytes, int Width, int Height, int Flags, int Stride);
[DllImport(LIBNAME)]
public static extern int Img_Unload(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_GetPageCount(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_SetPage(int ImgObj, int PageIndex);
[DllImport(LIBNAME)]
public static extern int Img_GetSize(int ImgObj, out int Width, out int Height);
[DllImport(LIBNAME)]
public static extern int Img_DrawToDC(int ImgObj, int HandleDC, int X, int Y, ref int Width, ref int Height, int Flags);
[DllImport(LIBNAME)]
public static extern int Img_DeleteAllBlocks(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_AddBlock(int ImgObj, int Xpos, int Ypos, int Width, int Height, out int BlkObj);
[DllImport(LIBNAME)]
public static extern int Img_DeleteBlock(int ImgObj, int BlkObj);
[DllImport(LIBNAME)]
public static extern int Img_GetBlockCnt(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_GetBlock(int ImgObj, int BlockIndex, out int BlkObj);
[DllImport(LIBNAME)]
public static extern int Img_GetImgText(int ImgObj, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen, int Flags);
[DllImport(LIBNAME)]
public static extern int Img_GetBmpData(int ImgObj, IntPtr Bits, ref int Width, ref int Height, int Flags);
[DllImport(LIBNAME)]
public static extern int Img_OCR(int ImgObj, int FirstStep, int LastStep, int Flags);
[DllImport(LIBNAME)]
public static extern int Img_SaveBlocks(int ImgObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
[DllImport(LIBNAME)]
public static extern int Img_LoadBlocks(int ImgObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
[DllImport(LIBNAME)]
public static extern int Img_GetSkewAngle(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_GetPixLineCnt(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_GetPixLine(int ImgObj, int LineInd, out int X1pos, out int Y1pos, out int X2pos, out int Y2pos, out int Width);
[DllImport(LIBNAME)]
public static extern int Img_GetScaleFactor(int ImgObj);
[DllImport(LIBNAME)]
public static extern int Img_CalcPointPosition(int ImgObj, ref int Xpos, ref int Ypos, int Mode);
[DllImport(LIBNAME)]
public static extern int Img_CopyCurrentPage(int ImgObjSrc, int ImgObjDst, int Flags);
[DllImport(LIBNAME)]
public static extern int Img_GetProperty(int ImgObj, int PropertyID);
[DllImport(LIBNAME)]
public static extern int Img_SaveToFile(int ImgObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName, int Format, int Flags);
[DllImport(LIBNAME)]
public static extern int Img_SaveToMemory(int ImgObj, IntPtr Bytes, int BufferSize, int Format, int Flags);
////////
[DllImport(LIBNAME)]
public static extern int Blk_GetType(int BlkObj);
[DllImport(LIBNAME)]
public static extern int Blk_SetType(int BlkObj, int BlockType);
[DllImport(LIBNAME)]
public static extern int Blk_GetRect(int BlkObj, out int Xpos, out int Ypos, out int Width, out int Height);
[DllImport(LIBNAME)]
public static extern int Blk_GetText(int BlkObj, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen, int Flags);
[DllImport(LIBNAME)]
public static extern int Blk_GetLineCnt(int BlkObj);
[DllImport(LIBNAME)]
public static extern int Blk_GetLineText(int BlkObj, int LineIndex, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Blk_GetWordCnt(int BlkObj, int LineIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetWordText(int BlkObj, int LineIndex, int WordIndex, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Blk_SetWordText(int BlkObj, int LineIndex, int WordIndex, [MarshalAs(UnmanagedType.LPWStr)] string TextStr);
[DllImport(LIBNAME)]
public static extern int Blk_GetCharCnt(int BlkObj, int LineIndex, int WordIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetCharRect(int BlkObj, int LineIndex, int WordIndex, int CharIndex, out int Xpos, out int Ypos, out int Width, out int Height);
[DllImport(LIBNAME)]
public static extern int Blk_GetCharText(int BlkObj, int LineIndex, int WordIndex, int CharIndex, int ResultIndex, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Blk_GetCharQual(int BlkObj, int LineIndex, int WordIndex, int CharIndex, int ResultIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetTextRect(int BlkObj, int LineIndex, int WordIndex, out int Xpos, out int Ypos, out int Width, out int Height);
[DllImport(LIBNAME)]
public static extern int Blk_Inversion(int BlkObj, int Inversion);
[DllImport(LIBNAME)]
public static extern int Blk_Rotation(int BlkObj, int Rotation);
[DllImport(LIBNAME)]
public static extern int Blk_Mirror(int BlkObj, int Mirror);
[DllImport(LIBNAME)]
public static extern int Blk_IsWordInDictionary(int BlkObj, int LineIndex, int WordIndex);
[DllImport(LIBNAME)]
public static extern int Blk_SetRect(int BlkObj, int Xpos, int Ypos, int Width, int Height);
[DllImport(LIBNAME)]
public static extern int Blk_GetWordQual(int BlkObj, int LineIndex, int WordIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetWordFontColor(int BlkObj, int LineIndex, int WordIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetWordFontSize(int BlkObj, int LineIndex, int WordIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetWordFontStyle(int BlkObj, int LineIndex, int WordIndex);
[DllImport(LIBNAME)]
public static extern int Blk_GetBackgroundColor(int BlkObj);
[DllImport(LIBNAME)]
public static extern int Blk_SetWordRegEx(int BlkObj, int LineIndex, int WordIndex, [MarshalAs(UnmanagedType.LPWStr)] string RegEx, int Flags);
[DllImport(LIBNAME)]
public static extern int Blk_GetBarcodeCnt(int BlkObj);
[DllImport(LIBNAME)]
public static extern int Blk_GetBarcodeText(int BlkObj, int BarcodeInd, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Blk_GetBarcodeRect(int BlkObj, int BarcodeInd, out int Xpos, out int Ypos, out int Width, out int Height);
[DllImport(LIBNAME)]
public static extern int Blk_GetBarcodeType(int BlkObj, int BarcodeInd);
////////
[DllImport(LIBNAME)]
public static extern int Svr_Create(int CfgObj, int Format, out int SvrObj);
[DllImport(LIBNAME)]
public static extern int Svr_Destroy(int SvrObj);
[DllImport(LIBNAME)]
public static extern int Svr_NewDocument(int SvrObj);
[DllImport(LIBNAME)]
public static extern int Svr_AddPage(int SvrObj, int ImgObj, int Flags);
[DllImport(LIBNAME)]
public static extern int Svr_SaveToFile(int SvrObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
[DllImport(LIBNAME)]
public static extern int Svr_SaveToMemory(int SvrObj, IntPtr Bytes, int BufferSize);
[DllImport(LIBNAME)]
public static extern int Svr_GetText(int SvrObj, int PageIndex, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder TextStr, int MaxLen);
[DllImport(LIBNAME)]
public static extern int Svr_SetDocumentInfo(int SvrObj, int InfoID, [MarshalAs(UnmanagedType.LPWStr)] string InfoStr);
////////
[DllImport(LIBNAME)]
public static extern int Scan_Create(int CfgObj, out int ScanObj);
[DllImport(LIBNAME)]
public static extern int Scan_Destroy(int ScanObj);
[DllImport(LIBNAME)]
public static extern int Scan_Enumerate(int ScanObj, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder ScannerNames, int MaxLen, int Flags);
[DllImport(LIBNAME)]
public static extern int Scan_ScanToImg(int ScanObj, int ImgObj, int ScannerIndex, int Flags);
[DllImport(LIBNAME)]
public static extern int Scan_ScanToFile(int ScanObj, [MarshalAs(UnmanagedType.LPWStr)] string FileName, int ScannerIndex, int Flags);
}
}
'A VB.NET wrapper class for NSOCR
'******************************************************************************
' Nicomsoft OCR DLL interface
' Copyright (c) 2010-2016 Nicomsoft
' Copyright (c) 2010-2016 Michael Kapustin
' www.nsocr.com
'******************************************************************************
Public Class TNSOCR
'error codes
Public Const ERROR_FIRST = &H70000000
Public Const ERROR_FILENOTFOUND = &H70000001
Public Const ERROR_LOADFILE = &H70000002
Public Const ERROR_SAVEFILE = &H70000003
Public Const ERROR_MISSEDIMGLOADER = &H70000004
Public Const ERROR_OPTIONNOTFOUND = &H70000005
Public Const ERROR_NOBLOCKS = &H70000006
Public Const ERROR_BLOCKNOTFOUND = &H70000007
Public Const ERROR_INVALIDINDEX = &H70000008
Public Const ERROR_INVALIDPARAMETER = &H70000009
Public Const ERROR_FAILED = &H7000000A
Public Const ERROR_INVALIDBLOCKTYPE = &H7000000B
Public Const ERROR_EMPTYTEXT = &H7000000D
Public Const ERROR_LOADINGDICTIONARY = &H7000000E
Public Const ERROR_LOADCHARBASE = &H7000000F
Public Const ERROR_NOMEMORY = &H70000010
Public Const ERROR_CANNOTLOADGS = &H70000011
Public Const ERROR_CANNOTPROCESSPDF = &H70000012
Public Const ERROR_NOIMAGE = &H70000013
Public Const ERROR_MISSEDSTEP = &H70000014
Public Const ERROR_OUTOFIMAGE = &H70000015
Public Const ERROR_EXCEPTION = &H70000016
Public Const ERROR_NOTALLOWED = &H70000017
Public Const ERROR_NODEFAULTDEVICE = &H70000018
Public Const ERROR_NOTAPPLICABLE = &H70000019
Public Const ERROR_MISSEDBARCODEDLL = &H7000001A
Public Const ERROR_PENDING = &H7000001B
Public Const ERROR_OPERATIONCANCELLED = &H7000001C
Public Const ERROR_TOOMANYLANGUAGES = &H7000001D
Public Const ERROR_OPERATIONTIMEOUT = &H7000001E
Public Const ERROR_LOAD_ASIAN_MODULE= &H7000001F
Public Const ERROR_LOAD_ASIAN_LANG = &H70000020
Public Const ERROR_INVALIDOBJECT = &H70010000
Public Const ERROR_TOOMANYOBJECTS = &H70010001
Public Const ERROR_DLLNOTLOADED = &H70010002
Public Const ERROR_DEMO = &H70010003
'block types
Public Const BT_DEFAULT = 0
Public Const BT_OCRTEXT = 1
Public Const BT_ICRDIGIT = 2
Public Const BT_CLEAR = 3
Public Const BT_PICTURE = 4
Public Const BT_ZONING = 5
Public Const BT_OCRDIGIT = 6
Public Const BT_BARCODE = 7
Public Const BT_TABLE = 8
Public Const BT_MRZ = 9
'Constants for Img_LoadBmpData function
Public Const BMP_24BIT = &H0
Public Const BMP_8BIT = &H1
Public Const BMP_1BIT = &H2
Public Const BMP_32BIT = &H3
Public Const BMP_BOTTOMTOP = &H100
'Constants for Img_GetImgText, Blk_GetText and Svr_AddPage functions
Public Const FMT_EDITCOPY = &H0
Public Const FMT_EXACTCOPY = &H1
'for Img_OCR
Public Const OCRSTEP_FIRST = &H0 'first step
Public Const OCRSTEP_PREFILTERS = &H10 'filters before binarizing: scaling, invert, rotate etc
Public Const OCRSTEP_BINARIZE = &H20 'binarize
Public Const OCRSTEP_POSTFILTERS = &H50 'bin garbage filter etc
Public Const OCRSTEP_REMOVELINES = &H60 'find and remove lines
Public Const OCRSTEP_ZONING = &H70 'analyze page layout
Public Const OCRSTEP_OCR = &H80 'ocr itself
Public Const OCRSTEP_LAST = &HFF 'last step
'for Img_OCR, "Flags" parameter
Public Const OCRFLAG_NONE = &H0 'default mode (blocking)
Public Const OCRFLAG_THREAD = &H1 'non-blocking mode
Public Const OCRFLAG_GETRESULT = &H2 'get result for non-blocking mode
Public Const OCRFLAG_GETPROGRESS = &H3 'get progress
Public Const OCRFLAG_CANCEL = &H4 'cancel ocr
'for Img_DrawToDC and Img_GetBmpData
Public Const DRAW_NORMAL = &H0
Public Const DRAW_BINARY = &H1
Public Const DRAW_GETBPP = &H100
'values for Blk_Inversion function
Public Const BLK_INVERSE_GET = -1
Public Const BLK_INVERSE_SET0 = 0
Public Const BLK_INVERSE_SET1 = 1
Public Const BLK_INVERSE_DETECT = &H100
'for Blk_Rotation function
Public Const BLK_ROTATE_GET = -1
Public Const BLK_ROTATE_NONE = 0
Public Const BLK_ROTATE_90 = &H1
Public Const BLK_ROTATE_180 = &H2
Public Const BLK_ROTATE_270 = &H3
Public Const BLK_ROTATE_ANGLE = &H100000
Public Const BLK_ROTATE_DETECT = &H100
'for Blk_Mirror function
Public Const BLK_MIRROR_GET = -1
Public Const BLK_MIRROR_H = &H1
Public Const BLK_MIRROR_V = &H2
'for Svr_Create function
Public Const SVR_FORMAT_PDF = &H1
Public Const SVR_FORMAT_RTF = &H2
Public Const SVR_FORMAT_TXT_ASCII = &H3
Public Const SVR_FORMAT_TXT_UNICODE = &H4
Public Const SVR_FORMAT_XML = &H5
Public Const SVR_FORMAT_PDFA = &H6
'for Scan_Enumerate function
Public Const SCAN_GETDEFAULTDEVICE = &H1
Public Const SCAN_SETDEFAULTDEVICE = &H100
'for Scan_ScanToImg and Scan_ScanToFile functions
Public Const SCAN_NOUI = &H1
Public Const SCAN_SOURCEADF = &H2
Public Const SCAN_SOURCEAUTO = &H4
Public Const SCAN_DONTCLOSEDS = &H8
Public Const SCAN_FILE_SEPARATE = &H10
'for Blk_GetWordFontStyle function
Public Const FONT_STYLE_UNDERLINED = &H1
Public Const FONT_STYLE_STRIKED = &H2
Public Const FONT_STYLE_BOLD = &H4
Public Const FONT_STYLE_ITALIC = &H8
'for Img_GetProperty function, PropertyID parameter
Public Const IMG_PROP_DPIX = &H1 'original DPI
Public Const IMG_PROP_DPIY = &H2
Public Const IMG_PROP_BPP = &H3 'color depth
Public Const IMG_PROP_WIDTH = &H4 'original width
Public Const IMG_PROP_HEIGHT = &H5 'original height
Public Const IMG_PROP_INVERTED = &H6 'image was inverted
Public Const IMG_PROP_SKEW = &H7 'image skew angle after OCR_STEP_PREFILTERS step, multiplied by 1000
Public Const IMG_PROP_SCALE = &H8 'image scale factor after OCR_STEP_PREFILTERS step, multiplied by 1000
Public Const IMG_PROP_PAGEINDEX = &H9 'image page index
'for "Blk_SetWordRegEx" function
Public Const REGEX_SET = &H0
Public Const REGEX_CLEAR = &H1
Public Const REGEX_CLEAR_ALL = &H2
Public Const REGEX_DISABLE_DICT = &H4
Public Const REGEX_CHECK = &H8
'for Svr_SetDocumentInfo function
Public Const INFO_PDF_AUTHOR = &H1
Public Const INFO_PDF_CREATOR = &H2
Public Const INFO_PDF_PRODUCER = &H3
Public Const INFO_PDF_TITLE = &H4
Public Const INFO_PDF_SUBJECT = &H5
Public Const INFO_PDF_KEYWORDS = &H6
'for Blk_GetBarcodeType function
Public Const BARCODE_TYPE_EAN8 = &H1
Public Const BARCODE_TYPE_UPCE = &H2
Public Const BARCODE_TYPE_ISBN10 = &H3
Public Const BARCODE_TYPE_UPCA = &H4
Public Const BARCODE_TYPE_EAN13 = &H5
Public Const BARCODE_TYPE_ISBN13 = &H6
Public Const BARCODE_TYPE_ZBAR_I25 = &H7
Public Const BARCODE_TYPE_CODE39 = &H8
Public Const BARCODE_TYPE_QRCODE = &H9
Public Const BARCODE_TYPE_CODE128 = &HA
'for "BarCode/TypesMask" configuration option
Public Const BARCODE_TYPE_MASK_EAN8 = &H1
Public Const BARCODE_TYPE_MASK_UPCE = &H2
Public Const BARCODE_TYPE_MASK_ISBN10 = &H4
Public Const BARCODE_TYPE_MASK_UPCA = &H8
Public Const BARCODE_TYPE_MASK_EAN13 = &H10
Public Const BARCODE_TYPE_MASK_ISBN13 = &H20
Public Const BARCODE_TYPE_MASK_ZBAR_I25 = &H40
Public Const BARCODE_TYPE_MASK_CODE39 = &H80
Public Const BARCODE_TYPE_MASK_QRCODE = &H100
Public Const BARCODE_TYPE_MASK_CODE128 = &H200
'for Img_SaveToFile function
Public Const IMG_FORMAT_BMP = 0
Public Const IMG_FORMAT_JPEG = 2
Public Const IMG_FORMAT_PNG = 13
Public Const IMG_FORMAT_TIFF = 18
Public Const IMG_FORMAT_FLAG_BINARIZED = &H100
End Class
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