Objective-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. Objective-C

#import <CkoPdf.h>
#import <CkoJsonObject.h>

BOOL success = NO;

//  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

CkoPdf *pdf = [[CkoPdf alloc] init];
success = [pdf LoadFile: @"qa_data/pdf/running_header.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
CkoJsonObject *jsonOut = [[CkoJsonObject alloc] init];

//  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" value: @"2"];
success = [pdf ExtractText: @"text" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@",@"---- default (repeated headers and footers excluded) ----");
NSLog(@"%@",[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" value: @"include"];
success = [pdf ExtractText: @"text" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@",@"---- repeatedHeadersFooters: include ----");
NSLog(@"%@",[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