(Java) 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 com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkPdf pdf = new CkPdf();

    // Load a PDF containing 2 remaining unsigned signature fields:
    boolean success = pdf.LoadFile("qa_data/pdf/doctor_patient_parent.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    // Note: This example requires Chilkat v9.5.0.90 or greater.
    CkJsonObject json = new CkJsonObject();
    pdf.GetUnsignedSigFields(json);

    json.put_EmitCompact(false);
    System.out.println(json.emit());

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

    // To iterate over the field names:
    String strVal;

    int i = 0;
    int count_i = json.SizeOfArray("unsignedSigField");
    while (i < count_i) {
        json.put_I(i);
        strVal = json.stringOf("unsignedSigField[i]");
        System.out.println(strVal);
        i = i+1;
        }
  }
}