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MOUSE_INPUT_DATA structure (ntddmou.h)

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MOUSE_INPUT_DATA contains one packet of mouse input data.

Syntax

typedef struct _MOUSE_INPUT_DATA {
  USHORT UnitId;
  USHORT Flags;
  union {
    ULONG Buttons;
    struct {
      USHORT ButtonFlags;
      USHORT ButtonData;
    };
  };
  ULONG  RawButtons;
  LONG   LastX;
  LONG   LastY;
  ULONG  ExtraInformation;
} MOUSE_INPUT_DATA, *PMOUSE_INPUT_DATA;

Members

UnitId

Specifies the unit number of the mouse device. A mouse device name has the format \Device\PointerPortN, where the suffix N is the unit number of the device. For example, a device, whose name is \Device\PointerPort0, has a unit number of zero, and a device, whose name is \Device\PointerPort1, has a unit number of one.

Flags

Specifies a bitwise OR of one or more of the following mouse indicator flags.

Value Meaning
MOUSE_MOVE_RELATIVE The LastX and LastY are set relative to the previous location.
MOUSE_MOVE_ABSOLUTE The LastX and LastY values are set to absolute values.
MOUSE_VIRTUAL_DESKTOP The mouse coordinates are mapped to the virtual desktop.
MOUSE_ATTRIBUTES_CHANGED The mouse attributes have changed. The other data in the structure is not used.
MOUSE_MOVE_NOCOALESCE (Windows Vista and later) WM_MOUSEMOVE notification messages will not be coalesced. By default, these messages are coalesced.

For more information about WM_MOUSEMOVE notification messages, see the Microsoft Software Development Kit (SDK) documentation

Buttons

Specifies both ButtonFlags and ButtonData values. Mouclass uses Buttons in its interrupt service routine to do a fast single memory access to ButtonFlags and ButtonData.

ButtonFlags

Specifies the transition state of the mouse buttons.

Flag Meaning
MOUSE_LEFT_BUTTON_DOWN The left mouse button changed to down.
MOUSE_LEFT_BUTTON_UP The left mouse button changed to up.
MOUSE_RIGHT_BUTTON_DOWN The right mouse button changed to down.
MOUSE_RIGHT_BUTTON_UP The right mouse button changed to up.
MOUSE_MIDDLE_BUTTON_DOWN The middle mouse button changed to down.
MOUSE_MIDDLE_BUTTON_UP The middle mouse button changed to up.
MOUSE_BUTTON_4_DOWN The fourth mouse button changed to down.
MOUSE_BUTTON_4_UP The fourth mouse button changed to up.
MOUSE_BUTTON_5_DOWN The fifth mouse button changed to down.
MOUSE_BUTTON_5_UP The fifth mouse button changed to up.
MOUSE_WHEEL Mouse wheel data is present.
MOUSE_HWHEEL Mouse horizontal wheel data is present.

ButtonData

Specifies mouse wheel data, if MOUSE_WHEEL is set in ButtonFlags.

RawButtons

Specifies the raw state of the mouse buttons. The Win32 subsystem does not use this member.

LastX

Specifies the signed relative or absolute motion in the x direction.

LastY

Specifies the signed relative or absolute motion in the y direction.

ExtraInformation

Specifies device-specific information.

Remarks

In response to IRP_MJ_READ (Mouclass) requests, Mouclass transfers zero or more MOUSE_INPUT_DATA structures from its internal data queue to the Microsoft Win32 subsystem buffer.

Requirements

Requirement Value
Header ntddmou.h (include Ntddmou.h)

See also

IRP_MJ_READ (Mouclass)

MouseClassServiceCallback