Subclassing and Hooking with Visual Basic

Name

MSLLHOOKSTRUCT

Synopsis

Contains information used by the WH_MOUSE_LL hook:

Public Type MSLLHOOKSTRUCT
        pt As POINTAPI
        mousedata As Long
        flags As Long
	    time As Long
        dwExtraInfo As Long
End Type

Structure Members

pt

The x and y coordinates of the mouse pointer.

mousedata

If the wParam parameter specifies the WM_MOUSEWHEEL message, the high-order word of this member contains the mouse wheel delta (a positive value means that the mouse wheel was rolled forward, a negative value means that it was rolled backward). If the wParam parameter specifies that an XButton was clicked, the high-order word of this member determines whether the first or second XButton was pressed. The low-order word is reserved by the system in both cases.

flags

Determines whether the message was injected. If ANDing this flag with 1 results in a 1 or True, this message was injected; otherwise, the message was not injected. You can inject a mouse message into the messaging system by using the SendInput function defined in Chapter 12.

time

The time that this message was posted to the message queue.

dwExtraInfo

Extra information.