Retrieving Text in Custom Rectangle with C# and .NET
Extracting text based on coordinates from PDF documents is useful for tasks such as data extraction, form field analysis, and content filtering. This method allows you to precisely locate and retrieve specific information from a PDF document by defining the coordinates of the area containing the desired text. This can be particularly beneficial for automating data processing, document analysis, and information retrieval tasks in various industries and applications.
Below is a step-by-step guide to extract text at given coordinates from PDF documents using PDF.Net.
Input file: Asset Recovery Evaluation.pdf
Output result:
Step-by-Step Guide
- Create a New Project
Open Visual Studio and create a new Console Application project.
- Add PDF.Net Reference
Download the PDF.Net library and add it to your project. You can do this by right-clicking on your project in the Solution Explorer, selecting "Add Reference," and browsing to the PDF.Net DLL.
- Write the Code to Extract Content
Below is a sample code snippet to extract text from a PDF document:
- Run the Application
Build and run your application. If everything is set up correctly, the content from the specified PDF file will be extracted.
Полный код
GitHubusing System;
using System.IO;
using SautinSoft;
using SautinSoft.Pdf;
using SautinSoft.Pdf.Content;
class Program
{
/// <summary>
/// Reading text
/// </summary>
/// <remarks>
/// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/reading-text-from-specific-rectangular-area.php
/// </remarks>
static void Main()
{
// Before starting this example, please get a free 100-day trial key:
// https://sautinsoft.com/start-for-free/
// Apply the key here:
// PdfDocument.SetLicense("...");
string pdfFile = Path.GetFullPath(@"..\..\..\simple text.pdf");
var pageIndex = 0;
double areaLeft = 200, areaRight = 520, areaBottom = 510, areaTop = 720;
using (var document = PdfDocument.Load(pdfFile))
{
// Retrieve first page object.
var page = document.Pages[pageIndex];
// Retrieve text content elements that are inside specified area on the first page.
var contentEnumerator = page.Content.Elements.All(page.Transform).GetEnumerator();
while (contentEnumerator.MoveNext())
{
if (contentEnumerator.Current.ElementType == PdfContentElementType.Text)
{
var textElement = (PdfTextContent)contentEnumerator.Current;
var bounds = textElement.Bounds;
contentEnumerator.Transform.Transform(bounds);
if (bounds.Left > areaLeft && bounds.Right < areaRight &&
bounds.Bottom > areaBottom && bounds.Top < areaTop)
{
// Read the text of an element located in a given area
Console.Write(textElement.ToString());
}
}
}
}
}
}Option Infer On
Imports System
Imports System.IO
Imports SautinSoft
Imports SautinSoft.Pdf
Imports SautinSoft.Pdf.Content
Friend Class Program
''' <summary>
''' Reading text
''' </summary>
''' <remarks>
''' Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/reading-text-from-specific-rectangular-area.php
''' </remarks>
Shared Sub Main()
' Before starting this example, please get a free license:
' https://sautinsoft.com/start-for-free/
' Apply the key here:
' PdfDocument.SetLicense("...");
Dim pdfFile As String = Path.GetFullPath("..\..\..\simple text.pdf")
Dim pageIndex = 0
Dim areaLeft As Double = 200, areaRight As Double = 520, areaBottom As Double = 510, areaTop As Double = 720
Using document = PdfDocument.Load(pdfFile)
' Retrieve first page object.
Dim page = document.Pages(pageIndex)
' Retrieve text content elements that are inside specified area on the first page.
Dim contentEnumerator = page.Content.Elements.All(page.Transform).GetEnumerator()
Do While contentEnumerator.MoveNext()
If contentEnumerator.Current.ElementType = PdfContentElementType.Text Then
Dim textElement = CType(contentEnumerator.Current, PdfTextContent)
Dim bounds = textElement.Bounds
contentEnumerator.Transform.Transform(bounds)
If bounds.Left > areaLeft AndAlso bounds.Right < areaRight AndAlso bounds.Bottom > areaBottom AndAlso bounds.Top < areaTop Then
' Read the text of an element located in a given area
Console.Write(textElement.ToString())
End If
End If
Loop
End Using
End Sub
End Class
Additional Features
- PDF.Net offers various other features for handling PDF documents, such as:
- Extracting images from PDF files.
- Converting PDF to other formats like DOCX, HTML, and images.
- Merging and splitting PDF files.
- Adding and reading interactive forms.
Conclusion
Extracting content from PDF documents based on specified boundaries using C# can be efficiently achieved with the help of SautinSoft's SautinSoft.Pdf library. This powerful tool allows developers to precisely locate and extract text or other elements within a PDF by defining specific boundaries.
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