Objective-C Requires Chilkat v11.7.0+

PDF Footnotes in Markdown: Inline, at the End, or Dropped

See more PDF Text Extraction Examples

Demonstrates the "footnotes" option of the "markdown" operation. Small-print notes at the foot of a page are kept where they are ("inline", the default), gathered at the end of the document ("end"), or left out ("none"). 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 two-page PDF used in this example is available at footnotes.pdf

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

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

//  Page 1 has two superscript references in the text and the two notes in small print at its foot;
//  page 2 has a third.
success = [pdf ExtractText: @"markdown" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@",@"---- footnotes: inline (default) ----");
NSLog(@"%@",[jsonOut StringOf: @"markdown"]);

[json UpdateString: @"footnotes" value: @"end"];
success = [pdf ExtractText: @"markdown" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@",@"---- footnotes: end ----");
NSLog(@"%@",[jsonOut StringOf: @"markdown"]);

[json UpdateString: @"footnotes" value: @"none"];
success = [pdf ExtractText: @"markdown" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@",@"---- footnotes: none ----");
NSLog(@"%@",[jsonOut StringOf: @"markdown"]);

//  Sample output:

//  ---- footnotes: inline (default) ----
//  <!-- page 1 -->
//  
//  # The Lens on Loan
//  
//  The society located a fourth-order lens of the correct period at a museum1 in the next county, and an agreement to loan it for ten years was signed in November.2 The lens will be lit with a low-wattage electric lamp rather than oil, and it will be displayed as a historic light rather than registered as an aid to navigation.
//  
//  1 The county maritime museum, which holds three lenses from decommissioned lights. 2 The loan is renewable and carries no fee; the society insures the lens.
//  
//  <!-- page 2 -->
//  
//  # Public Access
//  
//  The grounds opened to visitors on weekends from July. Nearly three thousand people climbed the tower over the summer,3 with no incidents.
//  
//  3 Counted at the entrance by the volunteers on duty.
//  
//  ---- footnotes: end ----
//  <!-- page 1 -->
//  
//  # The Lens on Loan
//  
//  The society located a fourth-order lens of the correct period at a museum1 in the next county, and an agreement to loan it for ten years was signed in November.2 The lens will be lit with a low-wattage electric lamp rather than oil, and it will be displayed as a historic light rather than registered as an aid to navigation.
//  
//  <!-- page 2 -->
//  
//  # Public Access
//  
//  The grounds opened to visitors on weekends from July. Nearly three thousand people climbed the tower over the summer,3 with no incidents.
//  
//  1 The county maritime museum, which holds three lenses from decommissioned lights. 2 The loan is renewable and carries no fee; the society insures the lens.
//  
//  3 Counted at the entrance by the volunteers on duty.
//  
//  ---- footnotes: none ----
//  <!-- page 1 -->
//  
//  # The Lens on Loan
//  
//  The society located a fourth-order lens of the correct period at a museum1 in the next county, and an agreement to loan it for ten years was signed in November.2 The lens will be lit with a low-wattage electric lamp rather than oil, and it will be displayed as a historic light rather than registered as an aid to navigation.
//  
//  <!-- page 2 -->
//  
//  # Public Access
//  
//  The grounds opened to visitors on weekends from July. Nearly three thousand people climbed the tower over the summer,3 with no incidents.