MOUSEHOOKSTRUCTEX structure (winuser.h)

Contains information about a mouse event passed to a WH_MOUSE hook procedure, MouseProc.

This is an extension of the MOUSEHOOKSTRUCT structure that includes information about wheel movement or the use of the X button.

Syntax

typedef struct tagMOUSEHOOKSTRUCTEX : tagMOUSEHOOKSTRUCT {
  DWORD mouseData;
} MOUSEHOOKSTRUCTEX, *LPMOUSEHOOKSTRUCTEX, *PMOUSEHOOKSTRUCTEX;

Inheritance

The MOUSEHOOKSTRUCTEX structure implements tagMOUSEHOOKSTRUCT.

Members

mouseData

Type: DWORD

If the message is WM_MOUSEWHEEL, the HIWORD of this member is the wheel delta. The LOWORD is undefined and reserved. A positive value indicates that the wheel was rotated forward, away from the user; a negative value indicates that the wheel was rotated backward, toward the user. One wheel click is defined as WHEEL_DELTA, which is 120.

If the message is WM_XBUTTONDOWN, WM_XBUTTONUP, WM_XBUTTONDBLCLK, WM_NCXBUTTONDOWN, WM_NCXBUTTONUP, or WM_NCXBUTTONDBLCLK, the HIWORD of mouseData specifies which X button was pressed or released, and the LOWORD is undefined and reserved. This member can be one or more of the following values. Otherwise, mouseData is not used.

Value Meaning
XBUTTON1
0x0001
The first X button was pressed or released.
XBUTTON2
0x0002
The second X button was pressed or released.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Header winuser.h (include Windows.h)

See also

Conceptual

Hooks

MOUSEHOOKSTRUCT

MouseProc

Reference

WM_MOUSEWHEEL

WM_NCXBUTTONDBLCLK

WM_NCXBUTTONDOWN

WM_NCXBUTTONUP

WM_XBUTTONDBLCLK

WM_XBUTTONDOWN

WM_XBUTTONUP