针对将 SD 卡插入 SD 卡读卡器的 VolumeChangeEvent 的 WMI 查询不起作用

Question

我正在开发一个应用程序，我希望在将 SD 卡插入 SD 卡读卡器时自动处理来自 SD 卡的数据。 SD卡读卡器插入电脑并分配E：和F：驱动器，当没有插入SD卡时显示为灰色。我一直在尝试使用基于 Win32__VolumeChangeEvent 或 Win32__DeviceChangeEvent 的 WMI 查询，但没有成功。我收到的“select * from Win32_VolumeChangeEvent”错误是无效类，当我将 SD 卡插入 SD 卡读卡器时，“select * from Win32_DeviceChangeEvent”不显示状态更新，仅用于插入和移除 SD读卡器本身。

我用来实验的一个类是：

 namespace eventTest
{
    class WMIReceiveEvent
    {
        static void Main(string[] args)
        {
            WMIReceiveEvent receiveEvent = new WMIReceiveEvent();
            Console.Read();
        }

        public WMIReceiveEvent()
        {
            try
            {
                ManagementScope scope = new ManagementScope("root\\CIMV2");
                scope.Options.EnablePrivileges = true;
                WqlEventQuery query = new WqlEventQuery("select * from Win32_DeviceChangeEvent");
                ManagementEventWatcher watcher = new ManagementEventWatcher(scope, query);
                Console.WriteLine("Waiting for an event...");

                watcher.EventArrived += new EventArrivedEventHandler(HandleEvent);

                // Start listening for events
                watcher.Start();
            }
            catch (ManagementException err)
            {
                Console.WriteLine("An error occurred while trying to receive an event: " + err.Message);
            }
        }

        private void HandleEvent(object sender,
            EventArrivedEventArgs e)
        {
            Console.WriteLine(e.NewEvent.GetPropertyValue("EventType"));
        }
    }
}

任何人都可以向我们提供一个查询，我可以使用它来监控 Windows 中 SD 卡的到达，或者指出为什么 Win32_VolumeChangeEvent 不被接受为有效类，如果已修复，如何使用它来监控到达实际的 SD 卡？

Answer 1

以下代码是解决我的问题的有效解决方案，当 SD 卡进入 USB 连接的 SD 读卡器时，我会收到通知。查询是

SELECT * FROM __InstanceOperationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.Size > 0 AND TargetInstance.Description = "Removable disk"

选择大小大于 0 且涉及可移动驱动器的逻辑磁盘上的所有操作。可以进一步区分操作类型（插入和移除）并检索插入的 SD 卡的驱动器号。 （例子见this stackoverflow question）

编辑：插入时触发的事件似乎是一个“__InstanceModificationEvent”，可以用来代替 __InstanceOperationEvent（__InstanceModificationEvent 是 __InstanceOperationEvent 的子类），在这种情况下查询是：

SELECT * FROM __InstanceModificationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.Size > 0 AND TargetInstance.Description = "Removable disk"

完整示例：

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Management;
using System.Threading;


namespace eventTest
{
    class WMIReceiveEvent
    {
        static void Main(string[] args)
        {
            WMIReceiveEvent receiveEvent = new WMIReceiveEvent();
            Console.Read();
        }

        public WMIReceiveEvent()
        {
            try
            {
                ManagementScope scope = new ManagementScope("root\\CIMV2");
                scope.Options.EnablePrivileges = true;
                WqlEventQuery query = new WqlEventQuery("SELECT * FROM __InstanceModificationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_LogicalDisk' and TargetInstance.Size > 0 AND TargetInstance.Description = \"Removable disk\"");
                ManagementEventWatcher watcher = new ManagementEventWatcher(scope, query);
                Console.WriteLine("Waiting for an event...");

                watcher.EventArrived += new EventArrivedEventHandler(HandleEvent);

                // Start listening for events
                watcher.Start();
            }
            catch (ManagementException err)
            {
                Console.WriteLine("An error occurred while trying to receive an event: " + err.Message);
            }
        }

        private void HandleEvent(object sender,
            EventArrivedEventArgs e)
        {
            //ManagementBaseObject baseObject = (ManagementBaseObject)e.NewEvent;

           // if (baseObject.ClassPath.ClassName.Equals("__InstanceCreationEvent"))
                Console.WriteLine("A drive was connected");
            //else if (baseObject.ClassPath.ClassName.Equals("__InstanceDeletionEvent"))
                //Console.WriteLine("A drive was removed");
        }
    }
}