驱动开发学习笔记01:DRIVER_OBJECT数据结构

typedef struct _DRIVER_OBJECT {

CSHORT Type;

CSHORT Size;

//

// The following links all of the devices created by a single driver

// together on a list, and the Flags word provides an extensible flag

// location for driver objects.

//一个指向设备对象的指针

//设备对象可能为一个或者多个，所以指向设备对象的第一个指针，也是指向这个设别链的指针

//

PDEVICE_OBJECT DeviceObject;

ULONG Flags;

//

// The following section describes where the driver is loaded.  The count

// field is used to count the number of times the driver has had its

// registered reinitialization routine invoked.

//

//

PVOID DriverStart;

ULONG DriverSize;

PVOID DriverSection;

PDRIVER_EXTENSION DriverExtension;

//

// The driver name field is used by the error log thread

// determine the name of the driver that an I/O request is/was bound.

//记录程序的名字，用UNICODE字符串记录

//一般形式\Driver\[驱动程序名称]

//

UNICODE_STRING DriverName;

//

// The following section is for registry support.  Thise is a pointer

// to the path to the hardware information in the registry

//记录设备的硬件数据库键名 也是用UNICODE字符串记录

//一般形式：\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\SYSTEM

//

PUNICODE_STRING HardwareDatabase;

//

// The following section contains the optional pointer to an array of

// alternate entry points to a driver for "fast I/O" support.  Fast I/O

// is performed by invoking the driver routine directly with separate

// parameters, rather than using the standard IRP call mechanism.  Note

// that these functions may only be used for synchronous I/O, and when

// the file is cached.

//文件驱动的派遣函数

//

PFAST_IO_DISPATCH FastIoDispatch;

//

// The following section describes the entry points to this particular

// driver.  Note that the major function dispatch table must be the last

// field in the object so that it remains extensible.

//记录StartIO例程的函数地址用于串行化操作

//制定驱动卸载时所用的回调函数地址

//

PDRIVER_INITIALIZE DriverInit;

PDRIVER_STARTIO DriverStartIo;

PDRIVER_UNLOAD DriverUnload;

PDRIVER_DISPATCH MajorFunction[IRP_MJ_MAXIMUM_FUNCTION + 1];

} DRIVER_OBJECT;

typedef struct _DRIVER_OBJECT *PDRIVER_OBJECT;