使用c#的WMI文件监控
本文关键字:文件 监控 WMI 使用 | 更新日期: 2023-09-27 18:12:43
我正在用 c# 开发WMI(Windows Management Instrumentation),但是卡住了。
我必须使用WMI (c#)创建一个应用程序,类似于文件系统监视器。
我希望每次在特定文件夹中创建或删除新文件时都能收到通知。
MY WQL查询是:
SELECT * from _InstanceModificationEvent within 2 where TargetInstance ISA 'CIM_DataFile' and TargetInstance.Drive = 'C:' AND TargetInstance.Path='''Test'
当使用wbemtest运行查询时,它显示一条错误消息,提示Invalid Class.
有人能帮我解决这个问题吗?
为了检测文件何时被创建、修改或删除,必须使用__InstanceOperationEvent
WMI类,并且使用__Class
属性的值可以确定文件是否被修改、删除或创建。
试试这个示例
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();
}
}
}