I have two pdf files. On Sercurity tab both files have set Security Method: No Security and Document Assembly: Not Allowed and page Extraction: Not Allowed. Other items are allowed.
I using standart ITextSharp method to retrieve text from pdf:
PdfReader pdfReader = new PdfReader(fileName);
for (int page = 1; page <= pdfReader.NumberOfPages; page++)
{
ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy(); //LocationTextExtractionStrategy();
string currentText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
currentText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(currentText)));
text.Append(currentText);
From first file i can get currentText wihtout any problem from second file I cannot retrieve text, currentText is empty. I was trying with LocationTextExtractionStrategy, but result is the same. I opened this file in SodaPDF and convert it to txt file but this file is empty too (while frist file is converted to txt without any problems).
It is possible to read text from this file from C# or with any other application? If I buy Adobe Reader I will convert this file to txt ?
What is difference between these two files ?
Thanks
There may be a lot of pdf which actually are images. You cannot extracttext from imaged pdf as Bruno Lowagie said. you need to go for third party OCR for this.
you ca use Adobe Acrobat to convert the pdf to editable format like word, html..
I work as Social Media Developer at Aspose. I would suggest you to download and try Aspose.Pdf for .NET to convert PDF to Text file. In case your file contains images and you need to extract the text from those images, you can use Aspose.Pdf to convert Pdf file to images and then perform OCR using Aspose.OCR for .NET.
Following is the sample code to convert PDf to Text using Aspose.Pdf for .NET
//open document
Document pdfDocument = new Document("input.pdf");
//create TextAbsorber object to extract text
TextAbsorber textAbsorber = new TextAbsorber();
//accept the absorber for all the pages
pdfDocument.Pages.Accept(textAbsorber);
//get the extracted text
string extractedText = textAbsorber.Text;
// create a writer and open the file
TextWriter tw = new StreamWriter("extracted-text.txt");
// write a line of text to the file
tw.WriteLine(extractedText);
// close the stream
tw.Close();
Please download a free trial and try it.
Related
I want to find whether a text is present in the uploaded PDF file in ASP.NET c#.
using (MemoryStream str = new MemoryStream(this.docUploadField.FileBytes))
{
using (StreamReader sr = new StreamReader(str, Encoding.UTF8))
{
string line = sr.ReadToEnd();
}
}
I am getting the below as the file content when I read the contents of file.
Please help me with this
You surely need some PDF reading library.
Most famous being
IText (ITextSharp for who remembers it): https://github.com/itext/itext7-dotnet
PdfSharp: https://github.com/empira/PDFsharp
and many other free options.
With those you open pdf file and read it and take the text you need.
Usually they give you a collection of the PDF elements (paragraphs, images, etc etc, and you loop through them or use a search function to look for what you need)
Basically, I did ask already a question regarding on how to edit PDF File. But it seems that I need to pay a lot of money to achieve what I want. But here is the problem first,
I have a PDF Template containing a plain text like this {{Fullname}} like a placeholder and should be replaced with a certain value. Now, as I've said earlier, Editing the PDF File is a mess and tough because if it's not, I already saw a solution online for free.
Now, here is my Idea, What if I get the whole content of this template file and replace the placeholder with a certain value then create a new PDF File with the same content but the placeholder is already replaced?
I am trying to figure out this problem and here is my solution:
string destinationFile = Path.GetTempFileName();
string text = File.ReadAllText(sourceFile);
text = text.Replace("{{Fullname}}", "John Doe");
// Create a new PDF document
Document document = new Document();
PdfWriter.GetInstance(document, new FileStream(destinationFile, FileMode.Create));
document.Open();
// Add the text to the document
document.Add(new Paragraph(text));
// Close the document
document.Close();
Currently, I am using iTextSharp and does not meet what I expected. So, my question is, Is it possible to get all the content of the PDF File and modify it to create a new one? If yes, How?
I'm given to read a pdf texts and do some stuffs are extracting the texts. I 'm using iTextSharp to read the PDF. The problem here is that the PdfTextExtractor.GetTextFromPage doesnt give me all the contents of the page. For ex
In the above PDF I m unable to read texts that are highlighted in blue. Rest of the characters I m able t read. Below is the line that does the above
`string filePath = "myFile path";
PdfReader pdfReader = new PdfReader(filePath);
for (int page = 1; page<=1; page++)
{
ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
string currentPageText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
}`
Any suggestions here?
I have went through lots of queries and solution in SO but not specific to this query.
The reason for text extraction not extracting those texts is pretty simple: Those texts are not part of the static page content but form fields! But "Text extraction" in iText (and other PDF libraries I know, too) is considered to mean "extraction of the text of the static page content". Thus, those texts you miss simply are not subject to text extraction.
If you want to make form field values subject to your text extraction code, too, you first have to flatten the form field visualizations. "Flattening" here means making them part of the static page content and dropping all their form field dynamics.
You can do that by adding after reading the PDF in this line
PdfReader pdfReader = new PdfReader(filePath);
code to flatten this PDF and loading the flattened PDF into the pdfReader, e.g. like this:
MemoryStream memoryStream = new MemoryStream();
PdfStamper pdfStamper = new PdfStamper(pdfReader, memoryStream);
pdfStamper.FormFlattening = true;
pdfStamper.Writer.CloseStream = false;
pdfStamper.Close();
memoryStream.Position = 0;
pdfReader = new PdfReader(memoryStream);
Extracting the text from this re-initialized pdfReader will give you the text from the form fields, too.
Unfortunately, the flattened form text is added at the end of the content stream. As your chosen text extraction strategy SimpleTextExtractionStrategy simply returns the text in the order it is drawn, the former form fields contents all are extracted at the end.
You can change this by using a different text extraction strategy, i.e. by replacing this line:
ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
Using the LocationTextExtractionStrategy (which is part of the iText distribution) already returns a better result; unfortunately the form field values are not exactly on the same base line as the static contents we perceive to be on the same line, so there are some unexpected line breaks.
ITextExtractionStrategy strategy = new LocationTextExtractionStrategy();
Using the HorizontalTextExtractionStrategy (from this answer which contains both a Java and a C# version thereof) the result is even better. Beware, though, this strategy is not universally better, read the warnings in the answer text.
ITextExtractionStrategy strategy = new HorizontalTextExtractionStrategy();
How can I read pdf files and save contents to a text file using Spire.PDF?
For example: Here is a pdf file and here is the desired text file from that pdf
I tried the below code to read the file and save it to a text file
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(#"C:\Users\Tamal\Desktop\101395a.pdf");
StringBuilder buffer = new StringBuilder();
foreach (PdfPageBase page in doc.Pages)
{
buffer.Append(page.ExtractText());
}
doc.Close();
String fileName = #"C:\Users\Tamal\Desktop\101395a.txt";
File.WriteAllText(fileName, buffer.ToString());
System.Diagnostics.Process.Start(fileName);
But the output text file is not properly formatted. It has unnecessary whitespaces and a complete para is broken into multiple lines etc.
How do I get the desired result as in the desired text file?
Additionally, it is possible to detect and mark(like add a tag) to texts with bold, italic or underline forms as well? Also things get more problematic for pages have multiple columns of text.
Using iText
File inputFile = new File("input.pdf");
PdfDocument pdfDocument = new PdfDocument(new PdfReader(inputFile));
SimpleTextExtractionStrategy stes = new SimpleTextExtractionStrategy();
PdfCanvasProcessor canvasProcessor = new PdfCanvasProcessor(stes);
canvasProcessor.processPageContent(pdfDocument.getPage(1));
System.out.println(stes.getResultantText());
This is (as the code says) a basic/simple text extraction strategy.
More advanced examples can be found in the documentation.
Use IronOCR
var Ocr = new IronOcr.AutoOcr();
var Results = Ocr.ReadPdf("E:\Demo.pdf");
File.WriteAllText("E:\Demo.txt", Convert.ToString(Results));
For reference https://ironsoftware.com/csharp/ocr/
Using this you should get formatted text output, but not exact desire output which you want.
If you want exact pre-interpreted output, then you should check paid OCR services like OmniPage capture SDK & Abbyy finereader SDK
That is the nature of PDF. It basically says "go to this location on a page and place this character there." I'm not familiar at all with Spire.PFF; I work with Java and the PDFBox library, but any attempt to extract text from PDF is heuristic and hence imperfect. This is a problem that has received considerable attention and some applications have better results than others, so you may want to survey all available options. Still, I think you'll have to clean up the result.
I am trying to get the content of attachment. It may be an excel file, Document file or text file whatever it is but I want to store it in database so here I am using this code: -
foreach (FileAttachment file in em.Attachments)// Here em is type of EmailMessage class
{
Console.Write("Hello friends" + file.Name);
file.Load();
var stream = new System.IO.MemoryStream(file.Content);
var reader = new System.IO.StreamReader(stream, UTF8Encoding.UTF8);
var text = reader.ReadToEnd();
reader.Close();
Console.Write("Text Document" + text);
}
So By printing file.name is showing attachment file name but while printing 'text' on the console it is working if the attachment is .txt type but if it is .doc or .xls type then it is showing some symbolic result. I am not getting any text result. Am I doing something wrong or missing something. I want text result of any kind of file attachment . Please help me , I am beginner in C#
What you are seeing is what is actually in the file. Try opening one with Notepad.
There is no built-in way in .NET to show the "text contents" of arbitrary file formats. You'll have to create (preferably using third-party libraries that already solve this problem) some kind of logic that extracts plaintext from rich text documents.
See for example How to extract text from Pdf, Word and Excel documents?, Extract text from pdf and word files, and so on.
First, what do you expect when reading a binary file?
Your result is exactly what is expected. A text file can be shown as a string, but a doc or xls file is a binary file. You will see the binary content of the file. You will need to use a tool/lib to get the text/content from a binary file in human readable format.
TXT type is simple,DOC or XLS are much more complex.You can see TXT because is just text,DOC or XLS or PPT or something else needs to be interpreted by other mechanism.
See,for example,you have different colors or font sizes on a Word document,or a chart in an Excel document,how can you show that in a simple TextBox or RichTextBox?Short answer,you can't.