How to Extract Text with Formatting from PDFs Using iTextSharp?
Jan 11, 2025 am 10:46 AM
Extract formatted text using iTextSharp
Introduction:
iTextSharp is a powerful library for manipulating and generating PDF documents, but it is sometimes difficult to extract text with the desired format. This article provides a method to extract text and formatting information from PDF using iTextSharp.
Custom extraction strategy:
To extract formatted text, you can create a custom ITextExtractionStrategy implementation. This policy defines how text rendering information is handled.
Code snippet:
The following code defines a custom strategy that tracks changes in baseline, font name, and font size and generates HTML with appropriate styling:
<code>public class TextWithFontExtractionStategy : iTextSharp.text.pdf.parser.ITextExtractionStrategy
{
// ... (此處省略)
public void RenderText(iTextSharp.text.pdf.parser.TextRenderInfo renderInfo)
{
// 確定字體屬性
string curFont = renderInfo.GetFont().PostscriptFontName;
if (renderInfo.GetTextRenderMode() == (int)TextRenderMode.FillThenStrokeText)
{
curFont += "-Bold";
}
// 檢查基線、字體或字體大小的變化
Vector curBaseline = renderInfo.GetBaseline().GetStartPoint();
Single curFontSize = renderInfo.GetAscentLine().GetEndPoint()[Vector.I2] - curBaseline[Vector.I2];
if ((this.lastBaseLine == null) || (curBaseline[Vector.I2] != lastBaseLine[Vector.I2]) ||
(curFontSize != lastFontSize) || (curFont != lastFont))
{
// 生成帶有更新樣式的HTML span
result.AppendFormat("</code>
Usage:
To use a custom strategy, you can specify it when extracting text:
<code>PdfReader reader = new PdfReader("MyDocument.pdf");
TextWithFontExtractionStategy strategy = new TextWithFontExtractionStategy();
string textWithFormatting = PdfTextExtractor.GetTextFromPage(reader, 1, strategy);</code>
Output:
ThetextWithFormatting variable will contain the extracted text with HTML tags reflecting the formatting information, including font and font size.
Conclusion:
This custom extraction strategy allows you to extract PDF text with the desired format. This is a powerful tool that can be used to accurately reproduce text and styles in PDF documents.
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