Question

i have added following coe in my view class but still it’s not working.

BOOL CtestView::PreCreateWindow(CREATESTRUCT& cs)
{
  if (CView::PreCreateWindow(cs))
  {
     WNDCLASS wc;
     // Get the class information for the default MFC view class.
     ::GetClassInfo(AfxGetInstanceHandle(),cs.lpszClass,&wc);

     // Register a new class using the attributes of the default
     // view class, and make it the new default class.
     cs.lpszClass = AfxRegisterWndClass(wc.style | CS_DBLCLKS,
        wc.hCursor,wc.hbrBackground,wc.hIcon);
     return TRUE;
  }
  return FALSE;
}

Answer 1

Is your window set to receive double click events? See this MSDN article. Quote:

An application-defined window does
not, by default, receive double-click
messages. Because of the system
overhead involved in generating
double-click messages, these messages
are generated only for windows
belonging to classes that have the
CS_DBLCLKS class style. Your
application must set this style when
registering the window class.

You can also create your own double-clicks by managing up/down events, the delta between the cursor locations of those events and the time between them.

So for example, this sequence:

• Down message (save control)
• start timer
• less than 250 milliseconds passed
• up message (on same control)
• less than 250 milliseconds
• Down message (on same control)
• less than 250 milliseconds
• up message (on same control)

= double click

If in that sequence your timeout expires or the control changes you reset your counters and variables since the action was not a double click.