kmpdfkit_demo/Demo/Examples/ContentEditor/App.xaml.cs

using ComPDFKit.NativeMethod;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows;
using System.Xml;
using static ComPDFKit.NativeMethod.CPDFSDKVerifier;

namespace ContentEditor
{
    public class SDKLicenseHelper
    {
        public string key = string.Empty;
        public string secret = string.Empty;
        public SDKLicenseHelper()
        {
            string sdkLicensePath = "license_key_win.xml";
            Assembly assembly = Assembly.GetExecutingAssembly();
            XmlDocument xmlDocument = new XmlDocument();
            xmlDocument.Load(sdkLicensePath);
            var node = xmlDocument.SelectSingleNode("License");
            if (node != null)
            {
                key = node.Attributes["key"].Value;
                secret = node.Attributes["secret"].Value;
            }
        }
    }

    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            LicenseVerify();
        }

        private static bool LicenseVerify()
        {
            try
            {
                if (!CPDFSDKVerifier.LoadNativeLibrary())
                {
                    return false;
                }
                SDKLicenseHelper sdkLicenseHelper = new SDKLicenseHelper();
                LicenseErrorCode verifyResult = CPDFSDKVerifier.LicenseVerify(sdkLicenseHelper.key, sdkLicenseHelper.secret);
                if (verifyResult != LicenseErrorCode.LICENSE_ERR_SUCCESS)
                {
                    return false;
                }

                return true;

            }
            catch(Exception ex)
            {

            }

            return false;
        }
    }
}