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Windows NT
Yes
Win95
Yes
Win32s
Yes
Import Library
-
Header File
winuser.h
Unicode
No
Platform Notes
None

WM_MOUSEMOVE

The WM_MOUSEMOVE message is posted to a window when the cursor moves. If the mouse is not captured, the message is posted to the window that contains the cursor. Otherwise, the message is posted to the window that has captured the mouse.

WM_MOUSEMOVE

fwKeys = wParam; // key flags

xPos = LOWORD(lParam); // horizontal position of cursor

yPos = HIWORD(lParam); // vertical position of cursor

Parameters

fwKeys

Value of wParam. Indicates whether various virtual keys are down. This parameter can be any combination of the following values:

Value
Description
MK_CONTROL
Set if the CTRL key is down.
MK_LBUTTON
Set if the left mouse button is down.
MK_MBUTTON
Set if the middle mouse button is down.
MK_RBUTTON
Set if the right mouse button is down.
MK_SHIFT
Set if the SHIFT key is down.

xPos

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

yPos

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

Remarks

The MAKEPOINTS macro can be used to convert the lParam parameter to a POINTS structure.

See Also

GetCapture
, MAKEPOINTS, POINTS, SetCapture

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