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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.


The framework calls this member function when the user double-clicks the left mouse button.

afx_msg void OnLButtonDblClk( 
   UINT nFlags, 
   CPoint point  


Indicates whether various virtual keys are down. This parameter can be any combination of the following values:

  • 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.


Specifies the x- and y-coordinate of the cursor. These coordinates are always relative to the upper-left corner of the window.

Only windows that have the CS_DBLCLKS WNDCLASS style will receive OnLButtonDblClk calls. This is the default for Microsoft Foundation Class windows. Windows calls OnLButtonDblClk when the user presses, releases, and then presses the left mouse button again within the system's double-click time limit. Double-clicking the left mouse button actually generates four events: WM_LBUTTONDOWN, WM_LBUTTONUP messages, the WM_LBUTTONDBLCLK call, and another WM_LBUTTONUP message when the button is released.


This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.

Header: afxwin.h

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