LicenseHelper.cs

/*
 * LicenseHelper.cs
 *
 * An example C# wrapper for using PGSLIC in .NET applications.
 *
 * This example is for an application that has a license setting called
 * MaxLimit.
 *
 */
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Text;
 
namespace RomanNumerals
{
    public class LicenseHelper
    {
        const string PWD = "---Replace with your Developer Key---";
 
        enum pgslic_status {LICENSE_OK, LICENSE_WARNING, LICENSE_ERROR, LICENSE_EXPIRED, LICENSE_STALE};
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern pgslic_status checkLicense(byte[] path, byte[] pwd, byte[] key, byte[] appName, byte[] appInfo, byte[] cxnOpts);
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern System.IntPtr getAppName();
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern System.IntPtr getClientName();
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern System.IntPtr getExpiryDate();
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern bool isPerpetual();
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern System.IntPtr getSetting(byte[] settingName);
 
        [DllImport("pgslicmt.dll", CallingConvention = CallingConvention.Cdecl)]
        private static extern System.IntPtr getLastError();
 
        public bool CheckLicense(string licDir, string key, string appName)
        {
            switch (checkLicense(Encoding.ASCII.GetBytes(licDir), Encoding.ASCII.GetBytes(PWD), Encoding.ASCII.GetBytes(key), Encoding.ASCII.GetBytes(appName), Encoding.ASCII.GetBytes(""), Encoding.ASCII.GetBytes("")))
            {
                case pgslic_status.LICENSE_OK:
                    break;
 
                case pgslic_status.LICENSE_ERROR:
                    System.Windows.Forms.MessageBox.Show("License not valid: " + Marshal.PtrToStringAnsi(getLastError()), "License", MessageBoxButtons.OK, MessageBoxIcon.Hand);
                    return false;
 
                case pgslic_status.LICENSE_EXPIRED:
                    System.Windows.Forms.MessageBox.Show("License expired.\nClick on OK to activate or Cancel to exit.", "License", MessageBoxButtons.OKCancel, MessageBoxIcon.Hand);
                    return false;
 
                default:
                    throw new Exception("Unexpected license status value"); // Never happens
            }
            return true;
        }
 
        public void ShowLicenseInfo()
        {
            string licenseInfo = Marshal.PtrToStringAnsi(getAppName()) + " 1.0\n";
            licenseInfo += "Licensed to " + Marshal.PtrToStringAnsi(getClientName()) + "\n";
            if (isPerpetual())
            {
                licenseInfo += "License never expires\n";
            }
            else
            {
                licenseInfo += "License expires on " + Marshal.PtrToStringAnsi(getExpiryDate()) + "\n";
            }
            licenseInfo += "Maximum number = " + Marshal.PtrToStringAnsi(getSetting(Encoding.ASCII.GetBytes("MaxLimit")));
 
            System.Windows.Forms.MessageBox.Show(licenseInfo, "License Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
 
        public int GetMaxLimit()
        {
            return Convert.ToInt32(Marshal.PtrToStringAnsi(getSetting(Encoding.ASCII.GetBytes("MaxLimit"))));
        }
    }
}