(Objective-C) PDF List Unsigned Signature Fields

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Demonstrates how to list the unsigned signature fields in a PDF.

Note: This example requires Chilkat v9.5.0.90 or greater.

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

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

CkoPdf *pdf = [[CkoPdf alloc] init];

// Load a PDF containing 2 remaining unsigned signature fields:
BOOL success = [pdf LoadFile: @"qa_data/pdf/doctor_patient_parent.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

// Note: This example requires Chilkat v9.5.0.90 or greater.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[pdf GetUnsignedSigFields: json];

json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

// Result:
// {
//   "unsignedSigField": [
//     "doctor_signature",
//     "parent_signature"
//   ]
// }

// To iterate over the field names:
NSString *strVal = 0;

int i = 0;
int count_i = [[json SizeOfArray: @"unsignedSigField"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    strVal = [json StringOf: @"unsignedSigField[i]"];
    NSLog(@"%@",strVal);
    i = i + 1;
}