/// <summary>
/// Converts PDF to DOCX, RTF, HTML, Text with OCR engine.
/// </summary>
public void ConvertPdfToAllWithOCR(string pdfPath)
{
// To perform OCR we'll use free OCR library by Nicomsoft.
// https://www.nicomsoft.com/products/ocr/download/
// The library is freeware and can be used in commercial application.
// Also you have to insert this key: AB2A4DD5FF2A.
NsOCR = new NSOCRLib.NSOCRClass();
NsOCR.Engine_SetLicenseKey("AB2A4DD5FF2A"); //required for licensed version only
NsOCR.Engine_InitializeAdvanced(out CfgObj, out OcrObj, out ImgObj);
SautinSoft.PdfFocus f = new SautinSoft.PdfFocus();
f.OCROptions.Method += PerformOCRNicomsoft;
f.OCROptions.Mode = PdfFocus.COCROptions.eOCRMode.AllImages;
f.WordOptions.KeepCharScaleAndSpacing = false;
string pdfFile = pdfPath;
string outFile = String.Empty;
f.OpenPdf(pdfFile);
if (f.PageCount > 0)
{
// To Docx.
outFile = "Result.docx";
f.WordOptions.Format = PdfFocus.CWordOptions.eWordDocument.Docx;
if (f.ToWord(outFile) == 0)
{
System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile)
{
UseShellExecute = true
});
}
// To HTML.
outFile = "Result.html";
f.HtmlOptions.KeepCharScaleAndSpacing = false;
if (f.ToHtml(outFile) == 0)
{
System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile)
{
UseShellExecute = true
});
}
}
else
{
Console.WriteLine("Error: {0}!", f.Exception.Message);
Console.ReadLine();
}
}
public static byte[] PerformOCRNicomsoft(byte[] image)
{
NSOCRLib.NSOCRClass NsOCR;
int CfgObj = 0;
int OcrObj = 0;
int ImgObj = 0;
int SvrObj = 0;
NsOCR = new NSOCRLib.NSOCRClass();
NsOCR.Engine_SetLicenseKey("AB2A4DD5FF2A"); //required for licensed version only
NsOCR.Engine_InitializeAdvanced(out CfgObj, out OcrObj, out ImgObj);
// Scale
NsOCR.Cfg_SetOption(CfgObj, TNSOCR.BT_DEFAULT, "ImgAlizer/AutoScale", "0");
NsOCR.Cfg_SetOption(CfgObj, TNSOCR.BT_DEFAULT, "ImgAlizer/ScaleFactor", "4.0");
NsOCR.Cfg_SetOption(CfgObj, TNSOCR.BT_DEFAULT, "Languages/English", "1");
try
{
int res = 0;
Array imgArray = null;
using (MemoryStream ms = new MemoryStream(image))
{
ms.Flush();
imgArray = ms.ToArray();
}
res = NsOCR.Img_LoadFromMemory(ImgObj, ref imgArray, imgArray.Length);
if (res > TNSOCR.ERROR_FIRST)
{
return(null);
}
NsOCR.Svr_Create(CfgObj, TNSOCR.SVR_FORMAT_PDF, out SvrObj);
NsOCR.Svr_NewDocument(SvrObj);
res = NsOCR.Img_OCR(ImgObj, TNSOCR.OCRSTEP_FIRST, TNSOCR.OCRSTEP_LAST, TNSOCR.OCRFLAG_NONE);
if (res > TNSOCR.ERROR_FIRST)
{
return(null);
}
res = NsOCR.Svr_AddPage(SvrObj, ImgObj, TNSOCR.FMT_EXACTCOPY);
if (res > TNSOCR.ERROR_FIRST)
{
return(null);
}
Array outPdf = null;
NsOCR.Svr_SaveToMemory(SvrObj, out outPdf);
return((byte[])outPdf);
}
finally
{
}
}