public Tuple <byte[], string> CreateSearchablePdf(byte[] fileData, PdfMeta metaData)
{
try
{
int PageCountStart = GetPages(fileData);
string sessionName = TempData.Instance.CreateNewSession();
OnCompressorEvent?.Invoke("Created Session:" + sessionName);
string inputDataFilePath = TempData.Instance.CreateTempFile(sessionName, ".pdf");
string outputDataFilePath = TempData.Instance.CreateTempFile(sessionName, ".pdf");
if (fileData == null || fileData.Length == 0)
{
throw new Exception("No Data in fileData");
}
using (FileStream writer = new FileStream(inputDataFilePath, FileMode.Create, FileAccess.Write))
{
writer.Write(fileData, 0, fileData.Length);
writer.Flush(true);
}
OnCompressorEvent?.Invoke(sessionName + " Wrote binary to file");
OnCompressorEvent?.Invoke(sessionName + " Begin Compress and Ocr");
string pageBody = CompressAndOcr(sessionName, inputDataFilePath, outputDataFilePath, metaData);
string outputFileName = outputDataFilePath;
if (PdfSettings.CompressFinalPdf)
{
OnCompressorEvent?.Invoke(sessionName + " Compressing output");
GhostScript gs = new GhostScript(GhostScriptPath, PdfSettings.Dpi);
outputFileName = gs.CompressPdf(outputDataFilePath, sessionName, PdfSettings.PdfCompatibilityLevel, PdfSettings.DistillerMode,
PdfSettings.DistillerOptions);
}
byte[] outFile = File.ReadAllBytes(outputFileName);
int PageCountEnd = GetPages(outFile);
OnCompressorEvent?.Invoke(sessionName + " Destroying session");
TempData.Instance.DestroySession(sessionName);
if (PageCountEnd != PageCountStart)
{
throw new PageCountMismatchException("Page count is different", PageCountStart, PageCountEnd);
}
return(new Tuple <byte[], string>(outFile, pageBody));
}
catch (Exception e)
{
OnExceptionOccurred?.Invoke(this, e);
throw new FailedToGenerateException("Error in: CreateSearchablePdf", e);
}
}
private string CompressAndOcr(string sessionName, string inputFileName, string outputFileName, PdfMeta meta)
{
string pageBody = "";
OnCompressorEvent?.Invoke(sessionName + " Creating PDF Reader");
PdfReader reader = new PdfReader(inputFileName, PdfSettings.Dpi, GhostScriptPath);
OnCompressorEvent?.Invoke(sessionName + " Creating PDF Writer");
PdfCreator writer =
new PdfCreator(PdfSettings, outputFileName, meta, PdfSettings.Dpi)
{
PdfSettings = { WriteTextMode = PdfSettings.WriteTextMode }
};
try
{
for (int i = 1; i <= reader.PageCount; i++)
{
OnCompressorEvent?.Invoke(sessionName + " Processing page " + i + " of " + reader.PageCount);
string img = reader.GetPageImage(i, sessionName, this);
if (OnPreProcessImage != null)
{
img = OnPreProcessImage(img);
}
Bitmap chk = new Bitmap(img);
Rectangle pageSize = new Rectangle(0, 0, chk.Width, chk.Height);
chk.Dispose();
pageBody = pageBody + writer.AddPage(img, PdfMode.Ocr, sessionName, pageSize);
}
writer.SaveAndClose();
writer.Dispose();
reader.Dispose();
return(pageBody);
}
catch (Exception x)
{
OnCompressorEvent?.Invoke(sessionName + " Image not supported in " + Path.GetFileName(inputFileName) + ". Skipping");
writer.SaveAndClose();
writer.Dispose();
reader.Dispose();
OnExceptionOccurred?.Invoke(this, x);
throw;
}
}