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WM_LBUTTONDOWN

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This message is posted when the user presses the touch screen in the client area of a window or presses the left mouse button while the cursor is located within the client area of a window. If another window does not capture the mouse or stylus event, the OS posts the message to the window beneath the stylus or mouse. If another window does capture the mouse or stylus, the OS posts the message to the window that has the capture.

WM_LBUTTONDOWN fwKeys = wParam; 
  xPos = LOWORD(lParam); 
  yPos = HIWORD(lParam);

Parameters

  • fwKeys
    Indicates the mouse buttons and keys that the user pressed. The following table shows the possible values, which can be combined.
    Value Description
    MK_CONTROL The user pressed the CTRL key.
    MK_LBUTTON The user pressed the left mouse button.
    MK_LBUTTONUP The left mouse button is up.
    MK_RBUTTON The user pressed the right mouse button.
    MK_SHIFT The user pressed the SHIFT key.
  • xPos
    Value of the low-order word of lParam. Specifies the x-coordinate of the cursor, 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, relative to the upper-left corner of the client area.

Return Values

An application should return zero if it processes this message.

Requirements

OS Versions: Windows CE 1.0 and later.
Header: Windows.h.

See Also

GetCapture | SetCapture | WM_LBUTTONDBLCLK | WM_LBUTTONUP

 Last updated on Wednesday, April 14, 2004

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