Documentation – Parse PDF documents

Net: Extract Text from PDF using C#

Sat, 05 Jun 2021 00:00:00 +0000

Articles in this section

Net: Extract Images from PDF C#

Sat, 05 Jun 2021 00:00:00 +0000

Images are held in each page’s Resources collection’s Images collection. To extract a particular page, then get the image from the Images collection using the particular index of the image.

The image’s index returns an XImage object. This object provides a Save method which can be used to save the extracted image. The following code snippet shows how to extract images from a PDF file.

// For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.PDF-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_Images();

// Open document
Document pdfDocument = new Document(dataDir+ "ExtractImages.pdf");

// Extract a particular image
XImage xImage = pdfDocument.Pages[1].Resources.Images[1];

FileStream outputImage = new FileStream(dataDir + "output.jpg", FileMode.Create);

// Save output image
xImage.Save(outputImage, ImageFormat.Jpeg);
outputImage.Close();

dataDir = dataDir + "ExtractImages_out.pdf";

// Save updated PDF file
pdfDocument.Save(dataDir);

Net: Extract fonts from PDF C#

Sat, 05 Jun 2021 00:00:00 +0000

In case you want to get all fonts from a PDF document, you can use FontUtilities.GetAllFonts() method provided in Document class. Please check following code snippet in order to get all fonts from an existing PDF document:

// For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.PDF-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
Document doc = new Document(dataDir + "input.pdf");
Aspose.Pdf.Text.Font[] fonts = doc.FontUtilities.GetAllFonts();
foreach (Aspose.Pdf.Text.Font font in fonts)
{
    Console.WriteLine(font.FontName);
}

Net: Extract Data from Table in PDF with C#

Sat, 05 Jun 2021 00:00:00 +0000

Extract Tables from PDF programmatically

Extracting tables from PDFs is not a trivial task because table can be created in the various way.

Aspose.PDF for .NET has a tool to make it easy to retrieve tables. To extract table data you shoud perform the following steps:

Open document - instantiate a Document object;
Create a TableAbsorber object.
Decide which pages to be analyzed and apply Visit to the desired pages. The tabular data will be scanned and the result will be stored in TableList.
TableList is a List of AbsorbedTable. To get the date iterate throught TableList and handle RowList and CellList
Each AbsorbedCell contains TextFragments collection. You can process it for your own purposes.

The following example shows table extraction from the all pages:

public static void Extract_Table()
{
    // Load source PDF document
    var filePath="<... enter path to pdf file here ...>";
    Aspose.Pdf.Document pdfDocument = new Aspose.Pdf.Document(filePath);                       
    foreach (var page in pdfDocument.Pages)
    {
        Aspose.Pdf.Text.TableAbsorber absorber = new Aspose.Pdf.Text.TableAbsorber();
        absorber.Visit(page);
        foreach (AbsorbedTable table in absorber.TableList)
        {
            Console.WriteLine("Table");
            foreach (AbsorbedRow row in table.RowList)
            {
                foreach (AbsorbedCell cell in row.CellList)
                {                                 
                    foreach (TextFragment fragment in cell.TextFragments)
                    {
                        var sb = new StringBuilder();
                        foreach (TextSegment seg in fragment.Segments)
                            sb.Append(seg.Text);
                        Console.Write($"{sb.ToString()}|");
                    }                           
                }
                Console.WriteLine();
            }
        }
    }
}

Extract table in specific area of PDF page

Each abosorbed table has Rectangle property that describes position of the table on page.

So, if you need to extract tables located in a specific region, you have to work with specific coordinates.

The following example show how to extract table marked with Square Annotation:

public static void Extract_Marked_Table()
{
    // Load source PDF document
    var filePath="<... enter path to pdf file here ...>";
    Aspose.Pdf.Document pdfDocument = new Aspose.Pdf.Document(filePath);  
    var page = pdfDocument.Pages[1];
    var squareAnnotation =
        page.Annotations.FirstOrDefault(ann => ann.AnnotationType == Annotations.AnnotationType.Square)
        as Annotations.SquareAnnotation;


    Aspose.Pdf.Text.TableAbsorber absorber = new Aspose.Pdf.Text.TableAbsorber();
    absorber.Visit(page);

    foreach (AbsorbedTable table in absorber.TableList)
    {
        var isInRegion = (squareAnnotation.Rect.LLX < table.Rectangle.LLX) &&
        (squareAnnotation.Rect.LLY < table.Rectangle.LLY) &&
        (squareAnnotation.Rect.URX > table.Rectangle.URX) &&
        (squareAnnotation.Rect.URY > table.Rectangle.URY);

        if (isInRegion)
        {
            foreach (AbsorbedRow row in table.RowList)
            {
                foreach (AbsorbedCell cell in row.CellList)
                {

                    foreach (TextFragment fragment in cell.TextFragments)
                    {
                        var sb = new StringBuilder();
                        foreach (TextSegment seg in fragment.Segments)
                        {
                            sb.Append(seg.Text);
                        }
                        var text = sb.ToString();
                        Console.Write($"{text}|");
                    }
                }
                Console.WriteLine();
            }
        }
    }
}

Extract Table Data from PDF and store it in CSV file

The following example shows how to extract table and store it as CSV file. To see how to convert PDF to Excel Spreadsheet please refer to Convert PDF to Excel article.

public static void Extract_Table_Save_CSV()
{
    // For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.PDF-for-.NET

    // Load PDF document
    Document pdfDocument = new Document(_dataDir + "input.pdf");

    // Instantiate ExcelSave Option object
    ExcelSaveOptions excelSave = new ExcelSaveOptions { Format = ExcelSaveOptions.ExcelFormat.CSV };

    // Save the output in XLS format
    pdfDocument.Save("PDFToXLS_out.xlsx", excelSave);
}

Net: Extract data from AcroForm using C#

Sat, 05 Jun 2021 00:00:00 +0000

Extract form fields from PDF document

As well as enabling you to generate form fields and fill form fields, Aspose.PDF for .NET makes it easy to extract form field data or information about form fields from PDF files.

In the sample code below we demonstrate how to iterate through each page in a PDF to extract information about all of the AcroForm in the PDF as well as the form field values. This sample code presumes that you don’t know the name of the form fields in advance.

public static void ExtractFormFields()
{
    var document = new Aspose.Pdf.Document(Path.Combine(_dataDir, "StudentInfoFormElectronic.pdf"));
    // Get values from all fields
    foreach (Field formField in document.Form)
    {
        Console.WriteLine("Field Name : {0} ", formField.PartialName);
        Console.WriteLine("Value : {0} ", formField.Value);
    }
}

If you do know the name of the form fields that you wish to extract values from then you can use indexer in Documents.Form collection to quickly retrieve this data. Look at the bottom of this article for a sample code on how to use that function.

Retrieve form field value by title

The form field’s Value property allows you to get the value of a particular field. To get the value, get the form field from the Document object’s Form collection. This example selects a TextBoxField and retrieves its value using the Value property.

Extract form fields from PDF document to JSON

public static void ExtractFormFieldsToJson()
{
    var document = new Aspose.Pdf.Document(Path.Combine(_dataDir, "StudentInfoFormElectronic.pdf"));
    var formData = document.Form.Cast<Field>().Select(f => new { Name = f.PartialName, f.Value });
    string jsonString = JsonSerializer.Serialize(formData);
    Console.WriteLine(jsonString);
}

Extract Data to XML from a PDF File

Form class allows you to export data to an XML file from the PDF file using ExportXml method. In order to export data to XML, you need to create an object of Form class and then call the ExportXml method using the FileStream object. Finally, you can close FileStream object and dispose Form object. The following code snippet shows you how to export data to XML file.

// For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdfFacades_Forms();

// Open document
Aspose.Pdf.Facades.Form form = new Aspose.Pdf.Facades.Form();
form.BindPdf(dataDir + "input.pdf");
// Create xml file.
System.IO.FileStream xmlOutputStream = new FileStream( dataDir + "input.xml", FileMode.Create);
// Export data
form.ExportXml(xmlOutputStream);
// Close file stream
xmlOutputStream.Close();

// Close the document
form.Dispose();

Export Data to FDF from a PDF File

Form class allows you to export data to an FDF file from the PDF file using ExportFdf method. In order to export data to FDF, you need to create an object of Form class and then call the ExportFdf method using the FileStream object. Finally, you can save the PDF file using Save method of the Form class. The following code snippet shows you how to export data to FDF file.

// For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdfFacades_Forms();

Aspose.Pdf.Facades.Form form = new Aspose.Pdf.Facades.Form();
// Open Document
form.BindPdf(dataDir + "input.pdf");

// Create fdf file.
System.IO.FileStream fdfOutputStream = new FileStream(dataDir + "student.fdf", FileMode.Create);

// Export data
form.ExportFdf(fdfOutputStream);

// Close file stream
fdfOutputStream.Close();

// Save updated document
form.Save(dataDir + "ExportDataToPdf_out.pdf");

Export Data to XFDF from a PDF File

Form class allows you to export data to an XFDF file from the PDF file using ExportXfdf method. In order to export data to XFDF, you need to create an object of Form class and then call the ExportXfdf method using the FileStream object. Finally, you can save the PDF file using Save method of the Form class. The following code snippet shows you how to export data to XFDF file.

// For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.Pdf-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdfFacades_Forms();

Aspose.Pdf.Facades.Form form = new Aspose.Pdf.Facades.Form();
// Open Document
form.BindPdf(dataDir + "input.pdf");

// Create xfdf file.
System.IO.FileStream xfdfOutputStream = new FileStream("student1.xfdf", FileMode.Create);

// Export data
form.ExportXfdf(xfdfOutputStream);

// Close file stream
xfdfOutputStream.Close();

// Save updated document
form.Save(dataDir + "ExportDataToXFDF_out.pdf");

Net: Extract Text From Stamps using C#

Sat, 30 Jan 2021 00:00:00 +0000

Extract Text from Stamp Annotations

Aspose.PDF for NET lets you extract text from stamp annotations. In order to extract text from Stamp Annotations in a PDF, the following steps can be used.

Create a Document class object
Get the desired Annotation from list of annotations of a page
Define a new object of TextAbsorber class
Use the TextAbsorber’s visit method to get the Text

public static void ExtractText()
{
   Document document = new Document(_dataDir + "ExtractStampText.pdf");
   Annotation item = document.Pages[1].Annotations[1];
   if (item is StampAnnotation annot) {
         TextAbsorber ta = new TextAbsorber();
         XForm ap = annot.Appearance["N"];
         ta.Visit(ap);
         Console.WriteLine(ta.Text);
   }
}