using System;
using System.Diagnostics;
using System.Text;
using System.Management;
using System.Runtime.InteropServices;
using System.Collections.Generic;

namespace BaseLibRWFile
{ 
    ///  
    /// 系统信息类 - 获取CPU、内存、磁盘、进程信息 
    ///  
    public class SystemInfo
    {
        private int m_ProcessorCount = 0;   //CPU个数 
        private  PerformanceCounter pcCpuLoad;   //CPU计数器 
        private long m_PhysicalMemory = 0;   //物理内存 

        private const int GW_HWNDFIRST = 0;
        private const int GW_HWNDNEXT = 2;
        private const int GWL_STYLE = (-16);
        private const int WS_VISIBLE = 268435456;
        private const int WS_BORDER = 8388608;

        private const int KB_DIV = 1024;
        private const int MB_DIV = 1024 * 1024;
        private const int GB_DIV = 1024 * 1024 * 1024;

        //上次记录CPU的时间
        TimeSpan prevCpuTime = TimeSpan.Zero;

        #region AIP声明 
        [DllImport("IpHlpApi.dll")]
        extern static public uint GetIfTable(byte[] pIfTable, ref uint pdwSize, bool bOrder);

        [DllImport("User32")]
        private extern static int GetWindow(int hWnd, int wCmd);

        [DllImport("User32")]
        private extern static int GetWindowLongA(int hWnd, int wIndx);

        [DllImport("user32.dll")]
        private static extern bool GetWindowText(int hWnd, StringBuilder title, int maxBufSize);

        [DllImport("user32", CharSet = CharSet.Auto)]
        private extern static int GetWindowTextLength(IntPtr hWnd);
        #endregion

        #region 构造函数 
        ///  
        /// 构造函数，初始化计数器等 
        ///  
        public SystemInfo()
        {
            //初始化CPU计数器 
            pcCpuLoad = new PerformanceCounter("Processor", "% Processor Time", "_Total");
            pcCpuLoad.MachineName = ".";
            pcCpuLoad.NextValue();
            //CPU个数 
            m_ProcessorCount = Environment.ProcessorCount;

            //获得物理内存 
            ManagementClass mc = new ManagementClass("Win32_ComputerSystem");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                if (mo["TotalPhysicalMemory"] != null)
                {
                    m_PhysicalMemory = long.Parse(mo["TotalPhysicalMemory"].ToString());
                }
            }
        }
        #endregion

        #region CPU个数 
        ///  
        /// 获取CPU个数 
        ///  
        public int ProcessorCount
        {
            get
            {
                return m_ProcessorCount;
            }
        }
        #endregion

        #region CPU占用率 
        ///  
        /// 获取CPU占用率 
        ///  
        public float CpuLoad//系统CPU使用率
        {
            get
            {
                return pcCpuLoad.NextValue();
            }
        }
        #endregion

        #region 可用内存 
        ///  
        /// 获取可用内存 
        ///  
        public long MemoryAvailable
        {
            get
            {
                long availablebytes = 0;
                //ManagementObjectSearcher mos = new ManagementObjectSearcher("SELECT * FROM Win32_PerfRawData_PerfOS_Memory"); 
                //foreach (ManagementObject mo in mos.Get()) 
                //{ 
                //    availablebytes = long.Parse(mo["Availablebytes"].ToString()); 
                //} 
                ManagementClass mos = new ManagementClass("Win32_OperatingSystem");
                foreach (ManagementObject mo in mos.GetInstances())
                {
                    if (mo["FreePhysicalMemory"] != null)
                    {
                        availablebytes = 1024 * long.Parse(mo["FreePhysicalMemory"].ToString());
                    }
                }
                return availablebytes;
            }
        }
        #endregion

        #region 物理内存 
        ///  
        /// 获取物理内存 
        ///  
        public long PhysicalMemory
        {
            get
            {
                return m_PhysicalMemory;
            }
        }
        #endregion

        #region 结束指定进程
        /// <summary>
        /// 结束指定进程
        /// </summary>
         /// <param name="pid">进程的 Process ID</param>
         public static void EndProcess(int pid)
         {
             try
             {
                 Process process = Process.GetProcessById(pid);
                 process.Kill();
             }
             catch { }
        }
         #endregion

        #region 查找所有应用程序标题
         /// <summary>
         /// 查找所有应用程序标题
         /// </summary>
         /// <returns>应用程序标题范型</returns>
         public static List<string> FindAllApps(int Handle)
         {
             List<string> Apps = new List<string>();
 
             int hwCurr;
             hwCurr = GetWindow(Handle, GW_HWNDFIRST);
 
             while (hwCurr > 0)
             {
                 int IsTask = (WS_VISIBLE | WS_BORDER);
                 int lngStyle = GetWindowLongA(hwCurr, GWL_STYLE);
                bool TaskWindow = ((lngStyle & IsTask) == IsTask);
                 if (TaskWindow)
                 {
                     int length = GetWindowTextLength(new IntPtr(hwCurr));
                     StringBuilder sb = new StringBuilder(2 * length + 1);
                     GetWindowText(hwCurr, sb, sb.Capacity);
                     string strTitle = sb.ToString();
                     if (!string.IsNullOrEmpty(strTitle))
                     {
                         Apps.Add(strTitle);
                     }
                 }
                 hwCurr = GetWindow(hwCurr, GW_HWNDNEXT);
             }
 
             return Apps;
         }
        #endregion

        #region new
        private Process processCurrent;
        private PerformanceCounter performanceCurrent;
        public void GetCurrentMemoryIni() 
        {
            processCurrent = Process.GetCurrentProcess();
            performanceCurrent = new PerformanceCounter("Process", "Working Set", processCurrent.ProcessName);      
            
        }
        public string GetCurrentMemory()
        { 
            //当前时间
            TimeSpan curCpuTime = processCurrent.TotalProcessorTime;
            //计算
            double value = (curCpuTime - prevCpuTime).TotalMilliseconds / 1000 / Environment.ProcessorCount * 100;
            prevCpuTime = curCpuTime;
            float fMemoryUsage = performanceCurrent.NextValue() / MB_DIV;
            return fMemoryUsage.ToString() + "," + value.ToString();
        }

        public long GetAllProcessMemory()
        {
            return  (PhysicalMemory - MemoryAvailable) / MB_DIV;//系统内存使用大小  MB
        }
        #endregion
        /// <summary>
        /// 硬盘序列号
        /// </summary>
        /// <returns></returns>
        public static string GetHardDiskID()
        {
            try
            {
                string hdInfo = "";//硬盘序列号  

                ManagementObject disk = new ManagementObject("win32_logicaldisk.deviceid=\"c:\"");

                hdInfo = disk.Properties["VolumeSerialNumber"].Value.ToString();

                disk = null;

                return hdInfo.Trim();
            }
            catch (Exception )
            {
                return "uHnIk";
            }
        }
    }
}