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
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. |
The MAKEPOINTS macro can be used to convert the lParam parameter to a POINTS structure.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
Mouse Input Overview, Mouse Input Messages, GetCapture, MAKEPOINTS, POINTS, SetCapture