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Editorial Team
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Asked: 2026-05-24T21:56:12+00:00

My task is to track adding and deleting disk drives from windows service. I

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My task is to track adding and deleting disk drives from windows service. I use RegisterServiceCtrlHandlerEx and RegisterDeviceNotification to implement this. My service control handler routine succefully receives SERVICE_CONTROL_DEVICEEVENT control code and handles DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE events for GUID_DEVINTERFACE_VOLUME clsss. By the way windows does not send DBT_DEVICEQUERYREMOVE, DBT_DEVICEQUERYREMOVEFAILED, DBT_DEVICEREMOVEPENDING events to my routine but now i want to solve another problem.

When i receive DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE events and dbch_devicetype is DBT_DEVTYP_DEVICEINTERFACE i can read device name from dbcc_name field of DEV_BROADCAST_DEVICEINTERFACE structure. It looks like this: \?\STORAGE#RemovableMedia#7&331a4e33&0&RM#{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}

I can convert this string to volume guid path using GetVolumeNameForVolumeMountPoint procedure only on DBT_DEVICEARRIVAL event. On DBT_DEVICEREMOVECOMPLETE event GetVolumeNameForVolumeMountPoint returns error 3 (The system cannot find the path specified).

On the other hand during service start i do scan for all volumes in the system with FindFirstVolume/FindNextVolume which returns to me list of volume GUID paths of all volumes.

So if volume exists when my service starts i can receive its volume GUID path. And if that volume will be removed while my service is running then i will receive device name (like \?\STORAGE#RemovableMedia#7&331a4e33&0&RM#{53f5630d-b6bf-11d0-94f2-00a0c91efb8b} ) from
DBT_DEVICEREMOVECOMPLETE event.

As i wrote above i can not use GetVolumeNameForVolumeMountPoint during DBT_DEVICEREMOVECOMPLETE event to get volume GUID path. So i would like to find a way to convert volume GUID path received from FindFirstVolume/FindNextVolume to device name. I need this to maintain my own list of present removable disk drives in the system.

Please give me some advice on this problem.

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1 Answer

  1. Editorial Team

    So i found no way to retrieve device paths from volume GUID paths returned by FindFisrtVolume/FindNextVolume. Instead i will replace FindFisrtVolume/FindNextVolume with enumerating device interfaces using SetupApi.

    Here is steps to do that:

    1. Call SetupDiGetClassDevs(&GUID_DEVINTERFACE_VOLUME,NULL,NULL,DIGCF_INTERFACEDEVICE|DIGCF_PRESENT) to retrieve device info set.
    2. Enum device interfaces with SetupDiEnumDeviceInterfaces(devinfoset,NULL,&GUID_DEVINTERFACE_VOLUME,idx,&devitf).
    3. For each device interface call SetupDiGetDeviceInterfaceDetail to retrieve device path.

    Unfortunately device path retrieved in this way differs in case from device path which windows passes in DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE events. So we need to normalize device paths when we compare them.

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