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

using ComPDFKit.NativeMethod;
using System.IO;
using System.Reflection;
using System.Windows;
using System.Xml;
using static ComPDFKit.NativeMethod.CPDFSDKVerifier;

namespace Viewer
{
    public class SDKLicenseHelper
    {
        public string key = string.Empty;
        public string secret = string.Empty;
        public SDKLicenseHelper()
        {
            string sdkLicensePath = "license_key_win.xml";
            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;
            }
        }

    }

    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    /// 
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            string str = this.GetType().Assembly.Location;
            base.OnStartup(e);
            LicenseVerify();
        }

        private static bool LicenseVerify()
        {
            bool result = false;

            result = CPDFSDKVerifier.LoadNativeLibrary();
            if (!result)
                return false;

            SDKLicenseHelper sdkLicenseHelper = new SDKLicenseHelper();

            LicenseErrorCode verifyResult = CPDFSDKVerifier.LicenseVerify(sdkLicenseHelper.key, sdkLicenseHelper.secret);
            if (verifyResult != LicenseErrorCode.LICENSE_ERR_SUCCESS)
                return false;
            return result;
        }
    }
}