Winlicense - WLGenLicenseDynSmartKey Call ASP.NET

WLGenLicenseDynSmartKey.cs

<%@ Page Language="C#" %>
<%@ import Namespace="System.Runtime.InteropServices" %>
<script runat="server">
    /******************************************************************
     WLGenLicenseSmartKey rev1 - sample code contributed by Sanjay Kanade, AvniTech.com in 2008.
	 WLGenLicenseDynSmartKey rev2- sample code by PipisCrew in 2016
	 
     You are  responsible for making any changes, testing and using it as per your 
     requirement. The author assumes no responsibility for any bugs or problems 
     arising from the use of the code.

     This is an ASP.NET example of WinLicense DynSmartKey generation. 
     It has been tested with ASP.NET v2/v4 and WinLicense v2.3.4.14.
      
     *WARNING* HOSTING REQUIREMENT *WARNING*:
     Since this uses InteropServices, it needs asp.net accounts in #full trust# (http://stackoverflow.com/a/2617483).
     If your hosting provider does not allow full trust (not available on shared host),
	 you will need to use a VPS type account. Please test it first and then consult
	 your hosting company if it doesn't work. 


     CUSTOMIZE THESE BEFORE USE:
     You will need to customize the following items before using this script. 
     Use Search to find the items in this source.
     * Actual hosted path of WinLicnseSDK.DLL in DllImport statement. 
     * LicenseHash variable: put the License Unique Key as string constant from 
       your WinLicense project. The string constant may need to be split on
       multiple lines.

    ******************************************************************/

    
    
    class WinlicenseSDK
    {
      [StructLayout(LayoutKind.Sequential)] 
     public class SystemTime 
     { 
        public short wYear; 
        public short wMonth; 
        public short wDayOfWeek; 
        public short wDay; 
        public short wHour; 
        public short wMinute; 
        public short wSecond; 
        public short wMilliseconds; 
     }

        [StructLayout(LayoutKind.Sequential)]
        public class sLicenseFeatures
        {
            public int cb;
            public int NumDays;
            public int NumExec;
            public SystemTime ExpDate;
            public int CountryId;
            public int Runtime;
            public int GlobalMinutes;
            public SystemTime InstallDate;
            public int NetInstances;
            public int EmbedLicenseInfoInKey;
            public int EmbedCreationDate;
        }

        [DllImport(@"c:\inetpub\WinlicenseSDK.dll", EntryPoint = "WLGenLicenseDynSmartKey", CallingConvention = CallingConvention.StdCall)]
        public static extern int WLGenLicenseDynSmartKey(
                string pLicenseHash, 
                string pUserName, 
                string pOrganization, 
                string pCustomData, 
                string pMachineID,
                sLicenseFeatures pLicenseFeatures,
                StringBuilder pBufferOut);
        }

    string getCodes(string machineID)
    {

		//PRJ - License Unique Key
        string LicenseHash = "x";
        
		string          pName = "costas";		//pass it on URL?
		string          pCompany = "pipiscrew"; //pass it on URL?
		
		StringBuilder LicenseKeyBuff = new StringBuilder(4000);

		//for the license expiration date - todo make it dynamic
		WinlicenseSDK.SystemTime t = new WinlicenseSDK.SystemTime();
		t.wDay = 31;
		t.wMonth=1;
		t.wYear=2016;
		t.wDayOfWeek=7; //sunday is 7
		t.wHour=10;
		t.wMilliseconds=1;
		t.wMinute=1;
		t.wSecond=1;

		//for the license creation date - todo make it dynamic
		WinlicenseSDK.SystemTime t2 = new WinlicenseSDK.SystemTime();
		t2.wDay = short.Parse (DateTime.Now.Day.ToString());
		t2.wMonth = 1;
		t2.wYear = 2016;
		t2.wDayOfWeek = 6; //saturday is 6
		t2.wHour = 10;
		t2.wMilliseconds = 1;
		t2.wMinute = 1;
		t2.wSecond = 1;
		
	
		WinlicenseSDK.sLicenseFeatures x= new WinlicenseSDK.sLicenseFeatures();
		x.EmbedLicenseInfoInKey = 1;
		x.EmbedCreationDate = 1;
		x.NetInstances = 0;
		x.GlobalMinutes = 0;
		x.Runtime = 0;
		x.NumExec = 0;
		x.NumDays = 0;
		x.CountryId = 0; //0 - no country restriction
		x.ExpDate = t;
		x.InstallDate = t2;
		
		//Returns the size of an unmanaged type in bytes. - http://stackoverflow.com/a/8744600
		x.cb = Marshal.SizeOf(typeof(WinlicenseSDK.sLicenseFeatures));
			
		WinlicenseSDK.WLGenLicenseDynSmartKey(LicenseHash, pName, pCompany, "1", machineID, x, LicenseKeyBuff);
		
		return LicenseKeyBuff.ToString().Trim();// "<softshop>Name: " + name + "\r\nCompany: " + company + "\r\nCode: " + LicenseKeyBuff.ToString().Trim() + "</softshop>"; 
   }


   //***********************************************
   void Page_Load (object sender, EventArgs e) {
     string machineID = Request.QueryString["machine"];

     if (machineID == null || machineID == "")
       Response.Write("Invalid request");
     else
         Response.Write(getCodes(machineID));

     Response.End();
   }
</script>