Unity limited time use limited trial time and use times

【 The time limit 】 modify Start() Function minTime and maxTime Time is enough . The time limit can also be accurate to seconds , such as ：

DateTime minTime = Convert.ToDateTime("2019-4-23 12:22:05");

【 Time limit 】SetPlayUseNumber() To limit the number of times , By modifying the key name, you can recalculate ("UseTime")

This script is a combination of limiting time and times , You can modify .

 

//***************************************************
// effect ： Limit the time or frequency of use 
// usage ： The time limit , modify Start() Function 
//SetPlayUseNumber() To limit the number of times , Modify key name ("UseTime") You can recalculate 
//
//***************************************************
using Microsoft.Win32;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class SetUserTime : MonoBehaviour {

    // Registered name , You can modify 
    string UseTime = "UseTime";
    // Number of trials 
    int num = 500;
    // Expiration prompt text （ Prompt panel ）
    public Button Btn_expire;

    // Use this for initialization
    void Start () {
        //===( For instance from 3 month 1 The day begins , To 4 month 1 End of the day )
        // As long as it's less than minTime Time or greater than maxTime Time , Will stop using 
        DateTime minTime = Convert.ToDateTime("2019-3-1");
        DateTime maxTime = Convert.ToDateTime("2019-4-1");
        if (minTime > DateTime.Now || DateTime.Now > maxTime)
        {
            //=== When it's due , Timeout prompt 
            UseTime = " It's due ";
            num = 0;
            print(" It's due ");
        }

        //=== This method is placed here , Time and times can be limited at the same time 
        SetPlayUseNumber();
        

        //if (minTime < DateTime.Now && DateTime.Now < maxTime)
        //{
        //    //=== For time limited functions 
        //    // During this time, you can use xx function 
        //}
    }

    /// <summary>
    ///  Set the number of times users use 
    /// </summary>
    void SetPlayUseNumber()
    {
        RegistryKey RootKey, RegKey;
        // The name of the item is ：HKEY_CURRENT_USER\Software
        RootKey = Registry.CurrentUser.OpenSubKey("SOFTWARE", true);
        // Open child ：HKEY_CURRENT_USER\Software\MyRegDataApp
        if ((RegKey = RootKey.OpenSubKey("MyProjectToControlUseTime", true)) == null)
        {
            RootKey.CreateSubKey("MyProjectToControlUseTime"); // non-existent , Then create a child 
            RegKey = RootKey.OpenSubKey("MyProjectToControlUseTime", true);
            RegKey.SetValue(UseTime, (object)num);// Create key values , Storage usable times 
            print(" Instantiation ");
            return;
        }
        try
        {
            object usetime = RegKey.GetValue(UseTime);// Read Key , The number of times that can be used 
            print(" You can also use :" + usetime + " Time ");
            int newtime = int.Parse(usetime.ToString()) - 1;// The number of times that can be used is reduced 1
            if (newtime < 0)
            {
                // Exit the program after expiration 
                RegKey.SetValue(UseTime, (object)newtime);
                Btn_expire.gameObject.SetActive(true);
                //Btn_expire.gameObject.transform.GetChild(0).GetComponent<Text>().text=" Trial expired , Please contact the Administrator ";

                Invoke("OnQuit", 3);// Delayed exit 
            }
            else
            {
                RegKey.SetValue(UseTime, (object)newtime);    // Update key value , The number of times that can be used is reduced 1
                //Btn_expire.gameObject.SetActive(false);

            }
        }
        catch
        {
            RegKey.SetValue(UseTime, (object)num);
            print(" Enter for the first time , Update usage ");
        }
    }

    private void OnQuit()
    {
        Application.Quit();
    }
}

====================================================

Extension add ： By modifying the xml Configuration file to change the time limit . It is necessary to change the probation period for the project that has been stopped , And the problem of repeated packaging .

practice ： Copy a xml File and rename it officeAll.xml, Then add a line inside <serverToTime>2020-12-31</serverToTime>, Add the following code to SetUserTime Script , And the serverToTime As the obtained final limit time, assign to maxTime.

void Start(){

        //serverToTime  By reading the time limited operation from the configuration file 
        string path_xml = System.Environment.CurrentDirectory + @"\ComputeBook\officeAll.xml";
        string serverToTime;
        if (System.IO.File.Exists(path_xml))
        {
            XmlDocument xmldoc = new XmlDocument();
            xmldoc.Load(path_xml);
            // In the configuration file, page 888 The actual effective time of the behavior , The rest are confusing documents 
            serverToTime = xmldoc.GetElementsByTagName("ServerToTime")[0].ChildNodes[0].InnerText;
        }
        else
        {
            serverToTime = "2020-12-31";
        }


       //...
        DateTime minTime = Convert.ToDateTime("2019-3-1");
        DateTime maxTime = Convert.ToDateTime(serverToTime );
       //...
       //...

}