低位与高位的设定

WM_RBUTTONUP Notification

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The WM_RBUTTONUP message is posted when the user releases the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.

A window receives this message through its WindowProc function.

Syntax

WM_RBUTTONUP

    WPARAM wParam
    LPARAM lParam;
    

Parameters

wParam

Indicates whether various virtual keys are down. This parameter can be one or more of the following values.

MK_CONTROL

The CTRL key is down.

MK_LBUTTON

The left mouse button is down.

MK_MBUTTON

The middle mouse button is down.

MK_RBUTTON

The SHIFT key is down.

MK_XBUTTON1

Windows 2000/XP: The first X button is down.

MK_XBUTTON2

Windows 2000/XP: The second X button is down.

lParam

The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.

The high-order word specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area.

GetParent()->SendMessage(WM_RBUTTONUP, nFlags, point.x | (point.y << 16));