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WM_LBUTTONDOWN Overview  Group

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 

 

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.

Return Values

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

Remarks

An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.

See Also

GetCapture, MAKEPOINTS, POINTS, SetCapture, WM_LBUTTONDBLCLK, WM_LBUTTONUP


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