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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.
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Is there a way to convert a PDF page to bitmap in c#? I tried with Ghostscript but I think it is file based. Thanks in advance.
LibPdf
This library converts converts PDF file to an image. Supported image formats are PNG and BMP, but you can easily add more.
using (FileStream file = File.OpenRead(#"..\path\to\pdf\file.pdf")) // in file
{
var bytes = new byte[file.Length];
file.Read(bytes, 0, bytes.Length);
using (var pdf = new LibPdf(bytes))
{
byte[] pngBytes = pdf.GetImage(0,ImageType.BMP); // image type
using (var outFile = File.Create(#"..\path\to\pdf\file.bmp")) // out file
{
outFile.Write(pngBytes, 0, pngBytes.Length);
}
}
}
Read this article: PDF to bmp Images (12 pages = 12 images)
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I got success to post photos to Twitter. But how do i post videos to Twitter using my C# application?. For posting pictures i used Tweetsharp. Can we use Tweetsharp's SendTweetWithMediaOptions to share video? if yes How?
This is sample i used to share picture to twitter
Bitmap img = new Bitmap(Server.MapPath(#"~/Images/Special/" + Convert.ToInt32(offerId) + "/" + specialOffer.Picture));
MemoryStream ms = new MemoryStream();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
ms.Seek(0, SeekOrigin.Begin);
Dictionary<string, Stream> images = new Dictionary<string, Stream> { { "mypicture", ms } };
var tweet = tweetservice.SendTweetWithMedia(new SendTweetWithMediaOptions { Status = urlTextToShare, Images = images });
and what i need is something like below image
You cannot upload videos to Twitter. If you read their documentation, it says:
Supported image formats are PNG, JPG and GIF, including animated GIFs of up to 3MB
You choices are either to upload an animated GIF or include a URL to a video (such as YouTube / Vimeo)
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I am trying to save a PDF file by saving the data from the FDF into a PDFTemplate, in my WPF application.
So, the situation is like this. I have a PDFTemplate.pdf which serves as a template and has placeholders (or fields). Now I generate this FDF file pro-grammatically, which in turn contain all the field names required for the PDFTemplate to be filled in. Also, this FDF contains the file path for the PDFTemaplte also, so that on opening, it knows which PDF to use.
Now, when try and double click on the FDF, it open the Adober Acrobat Reader and displays the PDFTemplate with the data filled in. But I can't save this file using the File menu, as it says this file will be saved without the data.
I would like to know if it is possible to import the FDF data into PDF and save it without using a thrid party component.
Also, if it is very difficult to do this, what would be the possible solution in terms of a free library that would be able to do it?
I just realized that iTextSharp is not free for commercial applications.
I have been able to achieve this using another library PDFSharp.
It is somewhat similar to how iTextSharp works except for some places where in iTextSharp is better and easier to use. I am posting the code in case someone would want to do something similar:
//Create a copy of the original PDF file from source
//to the destination location
File.Copy(formLocation, outputFileNameAndPath, true);
//Open the newly created PDF file
using (var pdfDoc = PdfSharp.Pdf.IO.PdfReader.Open(
outputFileNameAndPath,
PdfSharp.Pdf.IO.PdfDocumentOpenMode.Modify))
{
//Get the fields from the PDF into which the data
//is supposed to be inserted
var pdfFields = pdfDoc.AcroForm.Fields;
//To allow appearance of the fields
if (pdfDoc.AcroForm.Elements.ContainsKey("/NeedAppearances") == false)
{
pdfDoc.AcroForm.Elements.Add(
"/NeedAppearances",
new PdfSharp.Pdf.PdfBoolean(true));
}
else
{
pdfDoc.AcroForm.Elements["/NeedAppearances"] =
new PdfSharp.Pdf.PdfBoolean(true);
}
//To set the readonly flags for fields to their original values
bool flag = false;
//Iterate through the fields from PDF
for (int i = 0; i < pdfFields.Count(); i++)
{
try
{
//Get the current PDF field
var pdfField = pdfFields[i];
flag = pdfField.ReadOnly;
//Check if it is readonly and make it false
if (pdfField.ReadOnly)
{
pdfField.ReadOnly = false;
}
pdfField.Value = new PdfSharp.Pdf.PdfString(
fdfDataDictionary.Where(
p => p.Key == pdfField.Name)
.FirstOrDefault().Value);
//Set the Readonly flag back to the field
pdfField.ReadOnly = flag;
}
catch (Exception ex)
{
throw new Exception(ERROR_FILE_WRITE_FAILURE + ex.Message);
}
}
//Save the PDF to the output destination
pdfDoc.Save(outputFileNameAndPath);
pdfDoc.Close();
}
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I'm looking for a free to use c# library/code to create barcodes. Secifically I need to be able to create QR-Code type barcodes. I'm looking for free to use (Open Source or just Free, etc.) not pay to use.
Take a look QRCoder - pure C# open source QR code generator.
Can be used in three lines of code
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(textBoxQRCode.Text, QRCodeGenerator.ECCLevel.Q);
pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic(20);
ZXing is an open source project that can detect and parse a number of different barcodes. It can also generate QR-codes. (Only QR-codes, though).
There are a number of variants for different languages: ActionScript, Android (java), C++, C#, IPhone (Obj C), Java ME, Java SE, JRuby, JSP. Support for generating QR-codes comes with some of those: ActionScript, Android, C# and the Java variants.
Generate QR Code Image in ASP.NET Using Google Chart API
Google Chart API returns an image in response to a URL GET or POST request.
All the data required to create the graphic is included in the URL, including the image type and size.
var url = string.Format("http://chart.apis.google.com/chart?cht=qr&chs={1}x{2}&chl={0}", txtCode.Text, txtWidth.Text, txtHeight.Text);
WebResponse response = default(WebResponse);
Stream remoteStream = default(Stream);
StreamReader readStream = default(StreamReader);
WebRequest request = WebRequest.Create(url);
response = request.GetResponse();
remoteStream = response.GetResponseStream();
readStream = new StreamReader(remoteStream);
System.Drawing.Image img = System.Drawing.Image.FromStream(remoteStream);
img.Save("D:/QRCode/" + txtCode.Text + ".png");
response.Close();
remoteStream.Close();
readStream.Close();
txtCode.Text = string.Empty;
txtWidth.Text = string.Empty;
txtHeight.Text = string.Empty;
lblMsg.Text = "The QR Code generated successfully";
Click here for complete source code to download
Demo of application for free QR Code generator using C#
You can look at Open Source QR Code Library or messagingtoolkit-qrcode. I have not used either of them so I can not speak of their ease to use.
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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);
}
}
}
}