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我正在使用一段 C# 代码来检测连接的设备并列出它们。该代码应该在 kisok 计算机上运行，​​并帮助客户轻松访问和上传他们的文件。下面的代码可以正常工作，只是它不能识别移动设备等便携式设备。

public void WndProc(ref Message m)
{
    int devType;
    char c;

    if (m.Msg == WM_DEVICECHANGE)
    {
        // WM_DEVICECHANGE can have several meanings depending on the WParam value...
        switch (m.WParam.ToInt32())
        {
            // New device has just arrived
            case DBT_DEVICEARRIVAL:

                devType = Marshal.ReadInt32(m.LParam, 4);
                if (devType == DBT_DEVTYP_VOLUME)
                {
                    DEV_BROADCAST_VOLUME vol;
                    vol = (DEV_BROADCAST_VOLUME)
                        Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));

                    // Get the drive letter 
                    c = DriveMaskToLetter(vol.dbcv_unitmask);

                    /* rest of handler is here */
                }
                break;

            case DBT_DEVNODES_CHANGED:

                devType = Marshal.ReadInt32(m.LParam, 4); // m.LParam in this case is 0

                // handle portable device
                break;
        }
    }
}

所以连接移动设备时收到的 mWParam 等于 DBT_DEVNODES_CHANGED (0x0007) 并且 mLParam 为 0。是否可以从此事件中识别便携式设备？我可以在这里添加相关的检测 API 吗？

我已经尝试过以下 WMI 代码，但就像之前 HandleEvent 仅在连接 USB 而不是手机时触发:(

    ManagementEventWatcher watcher = new ManagementEventWatcher();
    WqlEventQuery query = new WqlEventQuery("SELECT * FROM Win32_VolumeChangeEvent WHERE EventType = 2");
    watcher.EventArrived += new EventArrivedEventHandler(HandleEvent);
    watcher.Query = query;
    watcher.Start();
    watcher.WaitForNextEvent();
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