使用C＃監視WMI文件

Question

我正在使用C＃開發WMI（Windows管理規范） ，並停留在某個地方。

我必須使用類似於File System Watcher的 WMI（C＃）創建一個應用程序。

每當在特定文件夾中創建或刪除新文件時，我都希望得到通知。

我的WQL查詢是：

SELECT * from _InstanceModificationEvent within 2 where TargetInstance ISA 'CIM_DataFile' and TargetInstance.Drive = 'C:' AND TargetInstance.Path='\\Test'

使用wbemtest運行查詢時，它會顯示一條錯誤消息，提示無效的類。

有人可以幫我嗎？

Answer 1

為了檢測何時創建，修改或刪除文件，您必須使用__InstanceOperationEvent WMI類，並且使用__Class屬性的值__Class文件是否被修改，刪除或創建。

試試這個樣本

using System;
using System.Collections.Generic;
using System.Management;
using System.Text;


namespace GetWMI_Info
{
    public class EventWatcherAsync
    {
        private void WmiEventHandler(object sender, EventArrivedEventArgs e)
        {
            // e.NewEvent
            string wclass = ((ManagementBaseObject)e.NewEvent).SystemProperties["__Class"].Value.ToString();
            string wop = string.Empty;
            switch (wclass)
            {
                case "__InstanceModificationEvent":
                    wop = "Modified";
                    break;
                case "__InstanceCreationEvent":
                    wop = "Created";
                    break;
                case "__InstanceDeletionEvent":
                    wop = "Deleted";
                    break;
            }
            string wfilename = ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["FileName"].ToString();

            if (!string.IsNullOrEmpty(((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Extension"].ToString()))
            {
                wfilename += "." + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Extension"].ToString();
            }
            Console.WriteLine(String.Format("The File {0} was {1}", wfilename, wop));


        }

        public EventWatcherAsync()
        {
            try
            {
                string ComputerName = "localhost";
                string WmiQuery;
                ManagementEventWatcher Watcher;
                ManagementScope Scope;


                if (!ComputerName.Equals("localhost", StringComparison.OrdinalIgnoreCase))
                {
                    ConnectionOptions Conn = new ConnectionOptions();
                    Conn.Username = "";
                    Conn.Password = "";
                    Conn.Authority = "ntlmdomain:DOMAIN";
                    Scope = new ManagementScope(String.Format("\\\\{0}\\root\\CIMV2", ComputerName), Conn);
                }
                else
                    Scope = new ManagementScope(String.Format("\\\\{0}\\root\\CIMV2", ComputerName), null);
                Scope.Connect();
                //Check for changes in the path C:\Test
                WmiQuery = @"Select * From __InstanceOperationEvent Within 1 
                Where TargetInstance ISA 'CIM_DataFile' and TargetInstance.Drive = 'C:' AND TargetInstance.Path='\\Test\\'";

                Watcher = new ManagementEventWatcher(Scope, new EventQuery(WmiQuery));
                Watcher.EventArrived += new EventArrivedEventHandler(this.WmiEventHandler);
                Watcher.Start();
                Console.Read();
                Watcher.Stop();
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception {0} Trace {1}", e.Message, e.StackTrace);
            }

        }

        public static void Main(string[] args)
        {
            Console.WriteLine("Listening {0}", "__InstanceOperationEvent");
            Console.WriteLine("Press Enter to exit");
            EventWatcherAsync eventWatcher = new EventWatcherAsync();
            Console.Read();
        }
    }
}