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Reading barcodes from pdf [closed]

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I was just wondering if anyone has experience reading barcodes from a pdf file. I googled and found this bytescout reader and used the program like this
Reader barcodeReader = new Reader();
barcodeReader.BarcodeTypesToFind.Code39 = true;
Console.WriteLine("Reading barcode(s) from PDF");
FoundBarcode[] barcodes = barcodeReader.ReadFrom("Sample.pdf");
foreach (FoundBarcode barcode in barcodes)
Console.WriteLine("Found barcode with type '{0}' and value '{1}'", barcode.Type, barcode.Value);
This doesn't output any barcodes.
Please suggest any other library I could use?

DataMatrix is a C# library that can decode barcodes from image files and I believe it can read them from PDFs too. Here is an example of usage:
private string DecodeText(string sFileName)
{
DmtxImageDecoder decoder = new DmtxImageDecoder();
System.Drawing.Bitmap oBitmap = new System.Drawing.Bitmap(sFileName);
List<string> oList = decoder.DecodeImage(oBitmap);
StringBuilder sb = new StringBuilder();
sb.Length = 0;
foreach (string s in oList)
{
sb.Append(s);
}
return sb.ToString();
}
You pass in an image filename and it will decode the barcode and return the string. If DataMatrix does not read from PDFs, then you'll have to also download iTextSharp which is a library for manipulating PDFs. Using iTextSharp, you can extract the barcode from the PDF, save it as an image, then use the function above to interpret the barcode.

Generate a pdf thumbnail (open source/free) [closed]

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Looking at other posts for this could not find an adequate solution that for my needs. Trying to just get the first page of a pdf document as a thumbnail. This is to be run as a server application so would not want to write out a pdf document to file to then call a third application that reads the pdf to generate the image on disk.
doc = new PDFdocument("some.pdf");
page = doc.page(1);
Image image = page.image;
Thanks.

Matthew Ephraim released an open source wrapper for Ghostscript that sounds like it does what you want and is in C#.
Link to Source Code: https://github.com/mephraim/ghostscriptsharp
Link to Blog Posting: http://www.mattephraim.com/blog/2009/01/06/a-simple-c-wrapper-for-ghostscript/
You can make a simple call to the GeneratePageThumb method to generate a thumbnail (or use GeneratePageThumbs with a start and end page number to generate thumbnails for multiple seperate pages, with each page being a seperate output file), default file format is jpeg but you can change it, and many other options, by using the alternate GenerateOutput method call and specify options such as file format, page size, etc...

I think that Windows API Code pack for Microsoft .NET framework might do the trick easiest. What it can is to generate the same thumbnail that Windows Explorer does (and that is first page), and you can chose several sizes, they go up to 1024x1024, so it should be enough. It is quite simple, just create ShellObject.FromParsingName(filepath) and find its Thumbnail subclass.
The problem might be what your server is. This works on Windows 7, Windows Vista and I guess Windows Server 2008. Also, Windows Explorer must be able to show thumbnails on that machine. The easiest way to insure that is to install Adobe Reader. If all of this is not a problem, I think that this is the most elegant way.
UPDATE: Adobe Reader has dropped support for thumbnails in the recent versions so its legacy versions must be used.
UPDATE2: According to comment from Roberto, you can still use latest version of Adobe Reader if you turn on thumbnails option in Edit - Preferences - General.

Download PDFLibNet and use the following code
public void ConvertPDFtoJPG(string filename, String dirOut)
{
PDFLibNet.PDFWrapper _pdfDoc = new PDFLibNet.PDFWrapper();
_pdfDoc.LoadPDF(filename);
for (int i = 0; i < _pdfDoc.PageCount; i++)
{
Image img = RenderPage(_pdfDoc, i);
img.Save(Path.Combine(dirOut, string.Format("{0}{1}.jpg", i,DateTime.Now.ToString("mmss"))));
}
_pdfDoc.Dispose();
return;
}
public Image RenderPage(PDFLibNet.PDFWrapper doc, int page)
{
doc.CurrentPage = page + 1;
doc.CurrentX = 0;
doc.CurrentY = 0;
doc.RenderPage(IntPtr.Zero);
// create an image to draw the page into
var buffer = new Bitmap(doc.PageWidth, doc.PageHeight);
doc.ClientBounds = new Rectangle(0, 0, doc.PageWidth, doc.PageHeight);
using (var g = Graphics.FromImage(buffer))
{
var hdc = g.GetHdc();
try
{
doc.DrawPageHDC(hdc);
}
finally
{
g.ReleaseHdc();
}
}
return buffer;
}

I used to do this kind of stuff with imagemagick (Convert) long ago.
There is a .Net Wrapper for that, maybe it's worth checking out :
http://imagemagick.codeplex.com/releases/view/30302

http://www.codeproject.com/KB/cs/GhostScriptUseWithCSharp.aspx
This works very well. The only dependencies are GhostScript's gsdll32.dll (you need to download GhostScript separately to get this, but there is no need to have GhostScript installed in your production environment), and PDFSharp.dll which is included in the project.

.NET C# library for lossless Exif rewriting? [closed]

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I have found various code and libraries for editing Exif.
But they are only lossless when the image width and height is multiple of 16.
I am looking for a library (or even a way to do it myself) to edit just the Exif portion in a JPEG file (or add Exif data if it doesn't exist yet), leaving the other data unmodified. Isn't that possible?
So far I could only locate the Exif portion (starts with 0xFFE1) but I don't understand how to read the data.

Here are the specifications for the Exif interchange format, if you plan to code your own library for editing tags.
http://www.exif.org/specifications.html
Here's a library written in Perl that meets your needs that you may be able to learn from:
http://www.sno.phy.queensu.ca/~phil/exiftool/
Here's a decent .NET library for Exif evaluation from The Code Project:
http://www.codeproject.com/KB/graphics/exiftagcol.aspx

You can do this without any external lib:
// Create image.
Image image1 = Image.FromFile("c:\\Photo1.jpg");
// Get a PropertyItem from image1. Because PropertyItem does not
// have public constructor, you first need to get existing PropertyItem
PropertyItem propItem = image1.GetPropertyItem(20624);
// Change the ID of the PropertyItem.
propItem.Id = 20625;
// Set the new PropertyItem for image1.
image1.SetPropertyItem(propItem);
// Save the image.
image1.Save("c:\\Photo1.jpg", ImageFormat.Jpg);
List of all possible PropertyItem ids (including exif) you can found here.
Update: Agreed, this method will re-encode image on save. But I have remembered another method, in WinXP SP2 and later there is new imaging components added - WIC, and you can use them to lossless write metadate - How-to: Re-encode a JPEG Image with Metadata.

exiv2net library (a .NET wrapper on top of exiv2) may be what you're looking for.

I wrote a small test where I compress one file many times to see the quality degradation and you can see it in the third-fourth compression, which is very bad.
But luckily, if you always use same QualityLevel with JpegBitmapEncoder there is no degradation.
In this example I rewrite keywords 100x in metadata and the quality seems not to change.
private void LosslessJpegTest() {
var original = "d:\\!test\\TestInTest\\20150205_123011.jpg";
var copy = original;
const BitmapCreateOptions createOptions = BitmapCreateOptions.PreservePixelFormat | BitmapCreateOptions.IgnoreColorProfile;
for (int i = 0; i < 100; i++) {
using (Stream originalFileStream = File.Open(copy, FileMode.Open, FileAccess.Read)) {
BitmapDecoder decoder = BitmapDecoder.Create(originalFileStream, createOptions, BitmapCacheOption.None);
if (decoder.CodecInfo == null || !decoder.CodecInfo.FileExtensions.Contains("jpg") || decoder.Frames[0] == null)
continue;
BitmapMetadata metadata = decoder.Frames[0].Metadata == null
? new BitmapMetadata("jpg")
: decoder.Frames[0].Metadata.Clone() as BitmapMetadata;
if (metadata == null) continue;
var keywords = metadata.Keywords == null ? new List<string>() : new List<string>(metadata.Keywords);
keywords.Add($"Keyword {i:000}");
metadata.Keywords = new ReadOnlyCollection<string>(keywords);
JpegBitmapEncoder encoder = new JpegBitmapEncoder {QualityLevel = 80};
encoder.Frames.Add(BitmapFrame.Create(decoder.Frames[0], decoder.Frames[0].Thumbnail, metadata,
decoder.Frames[0].ColorContexts));
copy = original.Replace(".", $"_{i:000}.");
using (Stream newFileStream = File.Open(copy, FileMode.Create, FileAccess.ReadWrite)) {
encoder.Save(newFileStream);
}
}
}
}

Determine number of pages in a PDF file [closed]

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I need to determine the number of pages in a specified PDF file using C# code (.NET 2.0). The PDF file will be read from the file system, and not from an URL. Does anyone have any idea on how this could be done? Note: Adobe Acrobat Reader is installed on the PC where this check will be carried out.

You'll need a PDF API for C#. iTextSharp is one possible API, though better ones might exist.
iTextSharp Example
You must install iTextSharp.dll as a reference. Download iTextsharp from SourceForge.net This is a complete working program using a console application.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using iTextSharp.text.pdf;
using iTextSharp.text.xml;
namespace GetPages_PDF
{
class Program
{
static void Main(string[] args)
{
// Right side of equation is location of YOUR pdf file
string ppath = "C:\\aworking\\Hawkins.pdf";
PdfReader pdfReader = new PdfReader(ppath);
int numberOfPages = pdfReader.NumberOfPages;
Console.WriteLine(numberOfPages);
Console.ReadLine();
}
}
}

This should do the trick:
public int getNumberOfPdfPages(string fileName)
{
using (StreamReader sr = new StreamReader(File.OpenRead(fileName)))
{
Regex regex = new Regex(#"/Type\s*/Page[^s]");
MatchCollection matches = regex.Matches(sr.ReadToEnd());
return matches.Count;
}
}
From Rachael's answer and this one too.

found a way at http://www.dotnetspider.com/resources/21866-Count-pages-PDF-file.aspx
this does not require purchase of a pdf library

One Line:
int pdfPageCount = System.IO.File.ReadAllText("example.pdf").Split(new string[] { "/Type /Page" }, StringSplitOptions.None).Count()-2;
Recommended:
ITEXTSHARP

I have used pdflib for this.
p = new pdflib();
/* Open the input PDF */
indoc = p.open_pdi_document("myTestFile.pdf", "");
pageCount = (int) p.pcos_get_number(indoc, "length:pages");

Docotic.Pdf library may be used to accomplish the task.
Here is sample code:
PdfDocument document = new PdfDocument();
document.Open("file.pdf");
int pageCount = document.PageCount;
The library will parse as little as possible so performance should be ok.
Disclaimer: I work for Bit Miracle.

I have good success using CeTe Dynamic PDF products. They're not free, but are well documented. They did the job for me.
http://www.dynamicpdf.com/

I've used the code above that solves the problem using regex and it works, but it's quite slow. It reads the entire file to determine the number of pages.
I used it in a web app and pages would sometimes list 20 or 30 PDFs at a time and in that circumstance the load time for the page went from a couple seconds to almost a minute due to the page counting method.
I don't know if the 3rd party libraries are much better, I would hope that they are and I've used pdflib in other scenarios with success.

Read from .msg files [closed]

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I need to read from Outlook .MSG file in .NET without using COM API for Outlook (cos it will not be installed on the machines that my app will run). Are there any free 3rd party libraries to do that? I want to extract From, To, CC and BCC fields. Sent/Receive date fields would be good if they are also stored in MSG files.

There is code avaliable on CodeProject for reading .msg files without COM. See here.

Update: I have found a 3rd party COM library called Outlook Redemption which is working fine for me at the moment. If you use it via COM-Interop in .NET, don't forget to release every COM object after you are done with it, otherwise your application crashes randomly.

Here's some sample VBA code using Outlook Redemption that Huseyint found.
Public Sub ProcessMail()
Dim Sess As RDOSession
Dim myMsg As RDOMail
Dim myString As String
Set Sess = CreateObject("Redemption.RDOSession")
Set myMsg = Sess.GetMessageFromMsgFile("C:\TestHarness\kmail.msg")
myString = myMsg.Body
myMsg.Body = Replace(myString, "8750", "XXXX")
myMsg.Save
End Sub

Microsoft has documented this: .MSG File Format Specification

It's a "Structured Storage" document. I've successfully used Andrew Peace's code to read these in the past, even under .NET (using C++/CLI) - it's clean and fairly easy to understand. Basically, you need to figure out which records you need, and query for those - it gets a little bit hairy, since different versions of Outlook and different types of messages will result in different records...

You can try our (commercial) Rebex Secure Mail library. It can read Outlooks MSG format. Following code shows how:
// Load message
MailMessage message = new MailMessage();
message.Load(#"c:\Temp\t\message.msg");
// show From, To and Sent date
Console.WriteLine("From: {0}", message.From);
Console.WriteLine("To: {0}", message.To);
Console.WriteLine("Sent: {0}", message.Date.LocalTime);
// find and try to parse the first 'Received' header
MailDateTime receivedDate = null;
string received = message.Headers.GetRaw("Received");
if (received != null)
{
int lastSemicolon = received.LastIndexOf(';');
if (lastSemicolon >= 0)
{
string rawDate = received.Substring(lastSemicolon + 1);
MimeHeader header = new MimeHeader("Date", rawDate);
receivedDate = header.Value as MailDateTime;
}
}
// display the received date if available
if (receivedDate != null)
Console.WriteLine("Received: {0}", receivedDate.LocalTime);
More info on Sent and Received dates and how are they represented in the message can be found at http://forum.rebex.net/questions/816/extract-senttime-receivetime-and-time-zones

If you open the .MSG file in a text editor, i believe you will find that the information you are after is stored as plain text inside the file. (It is on all the messages i have checked at least)
It would be pretty easy to write some code to parse the file looking for lines beginning with "From:" or "To:" etc. and then extracting the information you need.
If you need the body of the email as well, that may be a bit more complicated.