C# Requires Chilkat v11.7.0+

Extract Right-to-Left (Hebrew, Arabic) Text in Logical Order

See more PDF Text Extraction Examples

Demonstrates the "bidi" clean-up option. PDFs draw right-to-left text in visual order (the order of the glyphs on the page); by default the extracted text is reordered into logical order, so that it reads and compares correctly. Set "bidi" to false to get the glyphs in the order they are drawn. C#

bool success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example is available at hebrew_line.pdf

Chilkat.Pdf pdf = new Chilkat.Pdf();
success = pdf.LoadFile("qa_data/pdf/hebrew_line.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();

//  The page has a line of Hebrew with a Latin word (PDF) and a number (2026) embedded in it.
//  In logical order the line reads: kovetz PDF mishnat 2026 muchan ("the PDF file from 2026 is ready"),
//  with the Hebrew words in reading order and "PDF" and "2026" kept left to right.
success = pdf.ExtractText("text",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("---- default (bidi: true, logical order) ----");
Debug.WriteLine(jsonOut.StringOf("text"));

//  Without reordering, the Hebrew words come out reversed and in the opposite order, as drawn.
json.UpdateBool("bidi",false);
success = pdf.ExtractText("text",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("---- bidi: false (as drawn) ----");
Debug.WriteLine(jsonOut.StringOf("text"));

//  Sample output (the Hebrew is shown here transliterated):

//  ---- default (bidi: true, logical order) ----
//  Right-to-Left Text
//  
//  The line below is Hebrew with a Latin word and a number embedded in it:
//  
//  kovetz PDF mishnat 2026 muchan
//  ---- bidi: false (as drawn) ----
//  Right-to-Left Text
//  
//  The line below is Hebrew with a Latin word and a number embedded in it:
//  
//  nachum 2026 tanshim PDF ztevok    (the words in reverse order, each Hebrew word with its letters reversed)