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WM_NCRBUTTONDOWN message

Posted when the user presses the right mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.

A window receives this message through its WindowProc function.


#define WM_NCRBUTTONDOWN                0x00A4

Parameters

wParam

The hit-test value returned by the DefWindowProc function as a result of processing the WM_NCHITTEST message. For a list of hit-test values, see WM_NCHITTEST.

lParam

A POINTS structure that contains the x- and y-coordinates of the cursor. The coordinates are relative to the upper-left corner of the screen.

Return value

If an application processes this message, it should return zero.

Remarks

You can also use the GET_X_LPARAM and GET_Y_LPARAM macros to extract the values of the x- and y- coordinates from lParam.


xPos = GET_X_LPARAM(lParam); 
yPos = GET_Y_LPARAM(lParam); 

Important  Do not use the LOWORD or HIWORD macros to extract the x- and y- coordinates of the cursor position because these macros return incorrect results on systems with multiple monitors. Systems with multiple monitors can have negative x- and y- coordinates, and LOWORD and HIWORD treat the coordinates as unsigned quantities.

If it is appropriate to do so, the system sends the WM_SYSCOMMAND message to the window.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windowsx.h)

See also

Reference
DefWindowProc
GET_X_LPARAM
GET_Y_LPARAM
WM_NCHITTEST
WM_NCRBUTTONDBLCLK
WM_NCRBUTTONUP
WM_SYSCOMMAND
Conceptual
Mouse Input
Other Resources
MAKEPOINTS
POINTS

 

 

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