The WM_LBUTTONDOWN message is posted when the user presses 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_LBUTTONDOWN 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. |
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.
GetCapture, MAKEPOINTS, POINTS, SetCapture, WM_LBUTTONDBLCLK, WM_LBUTTONUP
file: /Techref/os/win/api/win32/mess/src/msg25_6.htm, 3KB, , updated: 2000/4/7 12:20, local time: 2024/10/10 13:06,
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