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WDM Driver Object and Device Object

Defined in wdm.h:

typedef struct _DRIVER_OBJECT
{
CSHORT Type;
CSHORT Size;
PDEVICE_OBJECT DeviceObject; // link list maintained by IO manager

PDRIVER_EXTENSION DriverExtension; // AddDevice

PUNICODE_STRING HardwareDatabase; //registry key for the device

PDRIVER_STARTIO DriverStartIo; // function processes IO request

PDRIVER_DISPATCH MajorFunction; // table of pointers to functions to handle io request
} DRIVER_OBJECT, *PDRIVER_OBJECT;

typedef struct _DEVICE_OBJECT
{
PDRIVER_OBJECT DriverObject;
PDEVICE_OBECT NextDevice;

RIRP CurrentIrp; // used by IRP queue routines
ULONG flags; // DO_BUFFERED_IO, etc
ULONG Characteristics; // FILE_REMOVABLE_MEDIA
PVOID DeviceExtension; // device instance specific data

DEVICE_TYPE DeviceType;
CCHAR StackSize;

} DEVICE_OBJECT, *PDEVICE_OBJECT;

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