运用API函数获取系统信息

< HTML >
     < HEAD >
         < title > SystemInfo </ title >
         < meta  name ="GENERATOR"  Content ="Microsoft Visual Studio .NET 7.1" >
         < meta  name ="CODE_LANGUAGE"  Content ="C#" >
         < meta  name ="vs_defaultClientScript"  content ="JavaScript" >
         < meta  name ="vs_targetSchema"  content ="http://schemas.microsoft.com/intellisense/ie5" >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < colgroup >
                 < col  width ="50%" >
                 < col  width ="50%" >
             </ colgroup >
             < table  width ="100%" >
                 < tr >
                     < td  bgcolor ="#99ccff" > Window及系统路径： </ td >
                     < td  bgcolor ="#99ccff" > 系统日期信息： </ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="WindowsDirectory"  runat ="server" > WindowsDirectory </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="Date"  runat ="server" > Date </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="SystemDirectory"  runat ="server" > SystemDirectoryLabel </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="Time"  runat ="server" > Time </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td  bgcolor ="#99ccff" > 内存信息： </ td >
                     < td  bgcolor ="#99ccff" > CUP信息： </ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="MemoryLoad"  runat ="server" > MemoryLoad </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="NumberOfProcessors"  runat ="server" > NumberOfProcessorsLabel </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="TotalPhys"  runat ="server" > TotalPhys </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="ProcessorType"  runat ="server" > ProcessorTypeLabel </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="AvailPhys"  runat ="server" > AvailPhys </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="ProcessorLevel"  runat ="server" > ProcessorLevelLabel </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="TotalPageFile"  runat ="server" > TotalPageFile </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="OemId"  runat ="server" > OemIdLabel </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="AvailPageFile"  runat ="server" > AvailPageFile </ asp:Label ></ td >
                     < td >
                         < asp:Label  id ="PageSize"  runat ="server" > PageSize </ asp:Label ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="TotalVirtual"  runat ="server" > TotalVirtualLabel </ asp:Label ></ td >
                     < td ></ td >
                 </ tr >
                 < tr >
                     < td >
                         < asp:Label  id ="AvailVirtual"  runat ="server" > AvailVirtualLabel </ asp:Label ></ td >
                     < td ></ td >
                 </ tr >
             </ table >
             < asp:Button  id ="Button1"  style ="Z-INDEX: 101; LEFT: 752px; POSITION: absolute; TOP: 304px"  Runat ="server"  Text ="获取" ></ asp:Button >
         </ form >
     </ body >
</ HTML >

public   class  SystemInfo : System.Web.UI.Page
{
        //要添加如下引用
        //using System.Runtime.InteropServices;
        //using System.Text;
        protected System.Web.UI.WebControls.Label WindowsDirectory;
        protected System.Web.UI.WebControls.Label SystemDirectory;
        protected System.Web.UI.WebControls.Label NumberOfProcessors;
        protected System.Web.UI.WebControls.Label ProcessorType;
        protected System.Web.UI.WebControls.Label ProcessorLevel;
        protected System.Web.UI.WebControls.Label OemId;
        protected System.Web.UI.WebControls.Label PageSize;
        protected System.Web.UI.WebControls.Label MemoryLoad;
        protected System.Web.UI.WebControls.Label TotalPhys;
        protected System.Web.UI.WebControls.Label AvailPhys;
        protected System.Web.UI.WebControls.Label TotalPageFile;
        protected System.Web.UI.WebControls.Label AvailPageFile;
        protected System.Web.UI.WebControls.Label TotalVirtual;
        protected System.Web.UI.WebControls.Label AvailVirtual;
        protected System.Web.UI.WebControls.Label Date;
        protected System.Web.UI.WebControls.Label Time;
        protected System.Web.UI.WebControls.Button Button1;

        //在调用API之前，你必须先导入System.Runtime.InteropServices这个名称空间。
        //其中，"DllImport"属性用来从不可控代码中调用一个方法，它指定了DLL的位置，该DLL中包含调用的外部方法；
        //"kernel32"设定了类库名；"public"指明函数的访问类型为公有的；
        //"static"修饰符声明一个静态元素，而该元素属于类型本身而不是指定的对象；
        //"extern"表示该方法将在工程外部执行，同时使用DllImport导入的方法必须使用"extern"修饰符
        [DllImport("kernel32")] 
        public static extern void GetWindowsDirectory(StringBuilder WinDir,int count);
        [DllImport("kernel32")] 
        public static extern void GetSystemDirectory(StringBuilder SysDir,int count);
        [DllImport("kernel32")] 
        public static extern void GetSystemInfo(ref CPU_INFO cpuinfo); 
        [DllImport("kernel32")] 
        public static extern void GlobalMemoryStatus(ref MEMORY_INFO meminfo); 
        [DllImport("kernel32")] 
        public static extern void GetSystemTime(ref SYSTEMTIME_INFO stinfo);

        //定义CPU的信息结构
        [StructLayout(LayoutKind.Sequential)] 
        public struct CPU_INFO 
        { 
            public uint dwOemId; 
            public uint dwPageSize; 
            public uint lpMinimumApplicationAddress; 
            public uint lpMaximumApplicationAddress; 
            public uint dwActiveProcessorMask; 
            public uint dwNumberOfProcessors; 
            public uint dwProcessorType; 
            public uint dwAllocationGranularity; 
            public uint dwProcessorLevel; 
            public uint dwProcessorRevision; 
        }
        //定义内存的信息结构
        [StructLayout(LayoutKind.Sequential)] 
        public struct MEMORY_INFO 
        {
            public uint dwLength;
            public uint dwMemoryLoad; 
            public uint dwTotalPhys; 
            public uint dwAvailPhys; 
            public uint dwTotalPageFile; 
            public uint dwAvailPageFile; 
            public uint dwTotalVirtual; 
            public uint dwAvailVirtual; 
        }
        //定义系统时间的信息结构
        [StructLayout(LayoutKind.Sequential)] 
        public struct SYSTEMTIME_INFO 
        { 
            public ushort wYear; 
            public ushort wMonth; 
            public ushort wDayOfWeek; 
            public ushort wDay; 
            public ushort wHour; 
            public ushort wMinute; 
            public ushort wSecond; 
            public ushort wMilliseconds; 
        }


        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//**//**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {    
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void Button1_Click(object sender, System.EventArgs e)
        {
            //调用GetWindowsDirectory和GetSystemDirectory函数分别取得Windows路径和系统路径
            const int nChars = 128;
            StringBuilder Buff = new StringBuilder(nChars);
            GetWindowsDirectory(Buff,nChars);
            WindowsDirectory.Text = "Windows路径："+Buff.ToString();
            GetSystemDirectory(Buff,nChars);
            SystemDirectory.Text = "系统路径："+Buff.ToString();
            //调用GetSystemInfo函数获取CPU的相关信息
            CPU_INFO CpuInfo;
            CpuInfo = new CPU_INFO();
            GetSystemInfo(ref CpuInfo);
            NumberOfProcessors.Text = "本计算机中有"+CpuInfo.dwNumberOfProcessors.ToString()+"个CPU";
            ProcessorType.Text = "CPU的类型为"+CpuInfo.dwProcessorType.ToString();
            ProcessorLevel.Text = "CPU等级为"+CpuInfo.dwProcessorLevel.ToString();
            OemId.Text = "CPU的OEM ID为"+CpuInfo.dwOemId.ToString();
            PageSize.Text = "CPU中的页面大小为"+CpuInfo.dwPageSize.ToString();
            //调用GlobalMemoryStatus函数获取内存的相关信息
            MEMORY_INFO MemInfo;
            MemInfo = new MEMORY_INFO();
            GlobalMemoryStatus(ref MemInfo);
            MemoryLoad.Text = MemInfo.dwMemoryLoad.ToString()+"%的内存正在使用";
            TotalPhys.Text = "物理内存共有"+MemInfo.dwTotalPhys.ToString()+"字节";
            AvailPhys.Text = "可使用的物理内存有"+MemInfo.dwAvailPhys.ToString()+"字节";
            TotalPageFile.Text = "交换文件总大小为"+MemInfo.dwTotalPageFile.ToString()+"字节";
            AvailPageFile.Text = "尚可交换文件大小为"+MemInfo.dwAvailPageFile.ToString()+"字节";
            TotalVirtual.Text = "总虚拟内存有"+MemInfo.dwTotalVirtual.ToString()+"字节";
            AvailVirtual.Text = "未用虚拟内存有"+MemInfo.dwAvailVirtual.ToString()+"字节";
            //调用GetSystemTime函数获取系统时间信息
            SYSTEMTIME_INFO StInfo;
            StInfo = new SYSTEMTIME_INFO();
            GetSystemTime(ref StInfo);
            Date.Text = StInfo.wYear.ToString()+"年"+StInfo.wMonth.ToString()+"月"+StInfo.wDay.ToString()+"日";
            Time.Text = (StInfo.wHour+8).ToString()+"点"+StInfo.wMinute.ToString()+"分"+StInfo.wSecond.ToString()+"秒";
        }
}