using Microsoft.Win32;

using System;
using System.Runtime.InteropServices;

namespace Common.system
{
    /// <summary>
    /// 释放内存帮助类 创建人：赵耀 创建时间：2020年8月12日
    /// </summary>
    public class FreeMemoryHelper
    {
        [DllImport("kernel32.dll")]
        private static extern bool SetProcessWorkingSetSize(IntPtr proc, int min, int max);

        /// <summary>
        /// Close、Hide、最小化页面时调用此方法，释放占用内存并重新分配 将暂时不需要的内容放进虚拟内存，当应用程序重新激活时，会将虚拟内存的内容重新加载到内存。
        /// 不宜过度频繁的调用该方法，频繁调用会降低使使用性能。 创建人：赵耀 创建时间：2020年8月12日
        /// </summary>
        public static void ReallocateMemory()
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();

            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
            {
                SetProcessWorkingSetSize(System.Diagnostics.Process.GetCurrentProcess().Handle, -1, -1);
            }
        }

        /// <summary>
        /// ---屏蔽DevExpress试用信息 与内存释放无关
        /// </summary>
        public static void SetDate()
        {
            CreateKey();
            RegistryKey currentUser = Registry.CurrentUser;
            RegistryKey registryKey = currentUser.OpenSubKey("SOFTWARE\\DevExpress\\Components", writable: true);
            if (registryKey != null)
            {
                registryKey.GetValue("LastAboutShowedTime");
                string value = DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss");
                registryKey.SetValue("LastAboutShowedTime", value);
            }
            currentUser.Dispose();
        }

        // 摘要: 创建键值
        private static void CreateKey()
        {
            RegistryKey currentUser = Registry.CurrentUser;
            if (currentUser.OpenSubKey("SOFTWARE\\DevExpress\\Components", writable: true) == null)
            {
                RegistryKey registryKey = currentUser.CreateSubKey("SOFTWARE\\DevExpress\\Components");
                if (registryKey != null)
                {
                    registryKey.CreateSubKey("LastAboutShowedTime")?.SetValue("LastAboutShowedTime", DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss"));
                    registryKey.CreateSubKey("DisableSmartTag")?.SetValue("LastAboutShowedTime", false);
                    registryKey.CreateSubKey("SmartTagWidth")?.SetValue("LastAboutShowedTime", 350);
                }
            }

            currentUser.Dispose();
        }
    }
}