C++ (Cpp) IoGetLowerDeviceObject Examples

Example #1

File: AttachDetach.c Project: Jcou1992/ulib-win

BOOLEAN FsFilterIsAttachedToDevice(
    __in PDEVICE_OBJECT DeviceObject
)
{
    PDEVICE_OBJECT nextDevObj    = NULL;
    PDEVICE_OBJECT currentDevObj = IoGetAttachedDeviceReference(DeviceObject);

    //
    //  Scan down the list to find our device object.
    //

    do
    {
        if (FsFilterIsMyDeviceObject(currentDevObj))
        {
            ObDereferenceObject(currentDevObj);
            return TRUE;
        }

        //
        //  Get the next attached object.
        //

        nextDevObj = IoGetLowerDeviceObject(currentDevObj);

        //
        //  Dereference our current device object, before moving to the next one.
        //

        ObDereferenceObject(currentDevObj);
        currentDevObj = nextDevObj;
    } while (NULL != currentDevObj);

    return FALSE;
}

Example #2

File: IoDeviceObject_drv.c Project: mutoso-mirrors/reactos

static
VOID
TestLowerDeviceKernelAPI(
    IN PDEVICE_OBJECT DeviceObject)
{
    PDEVICE_OBJECT RetObject;

    RetObject = IoGetLowerDeviceObject(DeviceObject);

    ok(RetObject == AttachDeviceObject,
        "Expected an Attached DeviceObject %p, got %p\n", AttachDeviceObject, RetObject);

    if (RetObject)
    {
        ObDereferenceObject(RetObject);
    }

    RetObject = IoGetDeviceAttachmentBaseRef(DeviceObject);
    ok(RetObject == AttachDeviceObject,
        "Expected an Attached DeviceObject %p, got %p\n", AttachDeviceObject, RetObject);

    if (RetObject)
    {
        ObDereferenceObject(RetObject);
    }

}