C＃WMI中的软盘噪声-Win32_LogicalDisk类

如何解决C＃WMI中的软盘噪声-Win32_LogicalDisk类

|| 我正在尝试使用WMI跟踪Windows上的USB设备插入和CD / DVD插入。但是，当我使用Win32_Logicaldisk类跟踪这些事件时，软盘开始发出噪音。 我的查询如下。第一个用于USB，第二个用于CD。

q = gcnew WqlEventQuery();
q->EventClassName = \"__InstanceCreationEvent\";
q->WithinInterval = TimeSpan(0,3);
q->Condition = \"TargetInstance ISA \'Win32_Logicaldisk\' and TargetInstance.DriveType = 2 and TargetInstance.deviceid <> \'A:\' and TargetInstance.deviceid <> \'B:\'\";
w = gcnew ManagementEventWatcher(scope,q);
w->EventArrived += gcnew EventArrivedEventHandler(USBAdded);
w->Start();

q = gcnew WqlEventQuery();
q->EventClassName = \"__InstanceModificationEvent\";
q->WithinInterval = TimeSpan(0,3);
q->Condition = \"TargetInstance ISA \'Win32_Logicaldisk\' and TargetInstance.DriveType = 5 and TargetInstance.deviceid <> \'A:\' and TargetInstance.deviceid <> \'B:\'\";
w = gcnew ManagementEventWatcher(scope,q);
w->EventArrived += gcnew EventArrivedEventHandler(LogicalInserted);
w->Start();

实际上，它不会在所有版本上产生噪音。任何想法将不胜感激。     

解决方法

根据此处的Microsoft WMI支持消息，我不确定Win32_LogicalDisk上的WMI查询是否能够在不启动每个轮询间隔的软盘的情况下运行。我正在尝试寻找自己解决该问题的另一种方法；在使用托管代码时，我正在考虑仅运行一个计时器并通过DriveInfo.GetDrives枚举可用的驱动器。 更新：在Windows服务中进行此操作时，并且已经按照此CodeProject文章中的描述实现了消息处理程序（但具有适当的异常处理和非托管内存清理功能），我只是为DBT_DEVICEARRIVAL和DBT_DEVICEREMOVECOMPLETE消息添加了处理程序。 （这归功于Chris Dickson，在这里向我指出了这篇文章。）我在处理程序中使用DriveInfo.GetDrives来确定已插入或卸下了哪些设备，因为我发现它比通过Win32获得驱动器号更简洁。没有定期轮询，没有凌乱的WMI，并且驱动器A现在保持安静。     ,我从WMI创建了一种新方法。

void MyDLPWMIDeviceListener::AddInsertUSBHandler()
{
        WqlEventQuery ^q;
        ManagementEventWatcher ^w;
        ManagementScope ^scope = gcnew ManagementScope(\"root\\\\CIMV2\");
        scope->Options->EnablePrivileges = true;
        try
        {
            q = gcnew WqlEventQuery();
            q->EventClassName = \"__InstanceCreationEvent\";
            q->WithinInterval = TimeSpan(0,3);
        q->Condition = \"TargetInstance ISA \'Win32_USBControllerDevice\'\";
            w = gcnew ManagementEventWatcher(scope,q);
            w->EventArrived += gcnew EventArrivedEventHandler(USBAdded);
            w->Start();
        }
        catch (Exception ^ex)
        {
            if (w != nullptr)
                w->Stop();
        }
}

之后，我处理了如下所示的事件：

void MyDLPWMIDeviceListener::USBAdded(Object ^sender,EventArrivedEventArgs ^e)
    {   
        try {

            PropertyData ^pd = e->NewEvent->Properties[\"TargetInstance\"];
            if (pd != nullptr)
            {
                ManagementBaseObject ^mbo = dynamic_cast<ManagementBaseObject ^>(pd->Value);
                if(mbo != nullptr && mbo->Properties[\"Dependent\"] != nullptr
                    && mbo->Properties[\"Dependent\"]->Value != nullptr) {
                    String ^str = (String ^)mbo->Properties[\"Dependent\"]->Value;
                    str = str->Replace(\"\\\"\",\"\");
                    String ^splitChar = \"=\";
                    array<String ^> ^strArr = str->Split(splitChar->ToCharArray());

                    WqlObjectQuery ^wqlQuery = gcnew WqlObjectQuery(\"Select * from Win32_PnPEntity where DeviceID = \'\"+strArr[1]+\"\'\");
                    ManagementObjectSearcher ^searcher = gcnew ManagementObjectSearcher(wqlQuery);
                    for each (ManagementObject ^usbCont in searcher->Get()) {
                        String ^pnpDeviceID = (String ^)usbCont->Properties[\"PNPDeviceID\"]->Value;
                        splitChar = \"\\\\\";
                        array<String ^> ^pnpDeviceIDArr = pnpDeviceID->Split(splitChar->ToCharArray());
                        if(pnpDeviceIDArr->Length == 3) {
                            if(pnpDeviceIDArr[0] == \"USB\") {
                                WqlObjectQuery ^wqlQueryDisk = gcnew WqlObjectQuery(\"Select * from Win32_DiskDrive where PNPDeviceID LIKE \'%\"+pnpDeviceIDArr[2]+\"%\'\");
                                ManagementObjectSearcher ^searcherDisk = gcnew ManagementObjectSearcher(wqlQueryDisk);
                                ManagementObjectCollection ^collectionDisk = searcherDisk->Get();
                                if(collectionDisk->Count == 0)
                                    continue;
                                else if (collectionDisk->Count == 1) {
                                    for each (ManagementObject ^disk in collectionDisk) {

                                    }
                                }
                                else {
                                    return;
                                }
                            } else {
                                return;
                            }
                        } else {
                            return;
                        }
                    }                   
                }
            }       
        } catch (Exception ^ex) {
        } 
    }