The WM_LBUTTONUP message is posted when the user releases the left 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.
WM_LBUTTONUP
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_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. |
If an application processes this message, it should return zero.
An application can use the MAKEPOINTS macro 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, WM_LBUTTONDBLCLK, WM_LBUTTONDOWN