C# Requires Chilkat v11.7.0+

Exclude or Include Running Headers and Page Numbers

See more PDF Text Extraction Examples

Demonstrates the "repeatedHeadersFooters" filter. Text repeated at the same position on most pages, such as a running header and "Page N of 4" footers, is left out by default; set the filter to "include" to keep it. C#

bool success = false;

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

//  The four-page PDF used in this example is available at running_header.pdf

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

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

//  Every page has the header "Harbor Lighthouse Society - Annual Report 2026" at the top right
//  and "Page N of 4" at the bottom.  By default both are excluded, so the text of page 2 is just
//  its heading and paragraphs.
json.UpdateString("pages","2");
success = pdf.ExtractText("text",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("---- default (repeated headers and footers excluded) ----");
Debug.WriteLine(jsonOut.StringOf("text"));

//  Include them.  The detection looks at the neighbouring pages even when only one page is
//  selected, so a single page extracted on its own still loses its running head by default.
json.UpdateString("repeatedHeadersFooters","include");
success = pdf.ExtractText("text",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("---- repeatedHeadersFooters: include ----");
Debug.WriteLine(jsonOut.StringOf("text"));

//  Sample output:

//  ---- default (repeated headers and footers excluded) ----
//  The Work
//  
//  The restoration society took ownership in 2021 with three goals: make the structure watertight, return the tower to public access, and relight the lantern with a historically accurate lens. The first two were met in the second season, and the lens arrived on loan in November.
//  
//  The spiral stair is original and is the most fragile part of the building. Twelve of the ninety-one treads were cracked or missing, and the central column had corroded badly at the second landing. The treads were cast from patterns taken off an intact tread.
//  ---- repeatedHeadersFooters: include ----
//  Harbor Lighthouse Society - Annual Report 2026
//  
//  The Work
//  
//  The restoration society took ownership in 2021 with three goals: ...
//  
//  The spiral stair is original and is the most fragile part of the building. ...
//  
//  Page 2 of 4