在 C# 中检测打印机配置更改

Question

有没有办法使用 C# 检测打印机的配置更改？

我在 c# 中有一个线程，它通常处于休眠状态，我希望它在配置发生任何变化时得到通知（比如有人 adds/removes/updates 打印机或有人更改了默认打印机）。一旦收到通知，它会显示简单的消息。

是否可以使用 C#.NET 或使用 WMI？我已经完成了可用的解决方案，但其中 none 似乎适合我的要求。

Answer 1

您可以使用 __InstanceModificationEvent event and the Win32_Printer WMI class

监控打印机配置更改

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)
        {
            Console.WriteLine("TargetInstance.Name :       " + ((ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value)["Name"]);

        }

        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();

                WmiQuery = "Select * From __InstanceModificationEvent Within 1 " +
                "Where TargetInstance ISA 'Win32_Printer' ";

                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}", "__InstanceModificationEvent");
            Console.WriteLine("Press Enter to exit");
            EventWatcherAsync eventWatcher = new EventWatcherAsync();
            Console.Read();
        }
    }
}

在 C# 中检测打印机配置更改

Detecting Printer configuration changes in c#

c#

wmi

printers