ATL Used for Connection Point and Toolbar Exposure

ActiveX Control as well as container, exposing toolbar. Includes event mapping of toolbar buttons at client side.


Click here for larger image

Environment: VC6 , NT4 , ATL 3.0


The control, I'm presenting here is not a utility or something like that, rather it is one kind of implementation in ATL. Where I found lots of guys in problem. I tried to implement a very simple control to show connection point implementation as well as a toolbar on the control to expose the events at client side.

Here I'm providing a interface in the form of toolbar to capture the events at client side, but implemented at server side.

The another part what I trying to do that I'm inserting this control in an MFC FRAMEWORK MDI using application CFormView just to make that different. You can map events of the toolbar for all the different views. You can insert this control on VB Forms and dialog based application in VC. I'm also trying to provide a menu with the name of the control in which there is option to remove and add the toolbor of control on control AND to hide and show the control on view.

And finally, I'm not implementing the Button Command4 handler at client side. You can implement this handle yourself.

In the demo you will get a Client exe and server dll. To run the exe first register the dll.

I had implemented as a control as well as a container so that you can insert another control into this as a child. For example I'm inserting WEBBROWSER2 Control. Overall what I want to show is that whenever you have to fire the command on any toolbar button, a request goes to the server side and than it comes back with some data from the server. Here it is on the server:

LRESULT OnCommand3( WORD wNotifyCode, 
                    WORD wID, 
                    HWND hWndCtl, 
                    BOOL& bHandled)
   //Firing events to implement at the client side for ToolBar
   Fire_Command3(L"U Can Get the parameter From Server Side");
   return 0;

And here it comes with same string on client side:

void CATLDemoClientView::OnCommand3Democtrl(LPCTSTR szStr)

which I presenting through Message Box, but you can get the kind of data like this at client side to provide a good communication using Connection point implementation.

You don't need to expose any method of control to make a call on any event , the way usually in the books you can find. OR to implememnt the WM_TIMER on server side so that you can fire any event on some specific condition. NO NEED OF ALL THIS.

But the better way is to expose some UI to the user so that the body can implement the event's on the client side, like the MFC framework does.

Here I'm inserting the control in client side in a very simple way:

int CATLDemoClientView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
   if (CFormView::OnCreate(lpCreateStruct) == -1)
         return -1;

   if(!m_oDemoCtrl.Create( "DemoControl",
       AfxMessageBox("Can't Create");
       // Adding tool bar here after getting the 
       // window handle from control properties.
       m_hCtrlWnd = (HWND)CtrlWnd;

   return 0;

And here I m implementing a another control as a child on server side:

LRESULT OnInitDialog( UINT uMsg,
                      WPARAM wParam, 
                      LPARAM lParam, 
                      BOOL& bHandled)

   // Containg a Web Browser Control as container
   // and intiating the interface of that control
   // you can contain any existing control as a child
   // and can hadle the functionality using toolbar 

   GetDlgControl( IDC_EXPLORER, 
   COleVariant noArg;
   //Showing URL
   m_spWebBrowser->Navigate( L"",
   return 0;


Download demo project - 91 Kb
Download source - 133 Kb

About the Author

Pardeep Kadian

Be young by heart, sharp by mind.
doesn't matter to have a whisky or wine.
Neither it belong to you nor mine.
Keep learning to always have a shine.


  • Could you tell me how to implement a Timer Connectionpoint?

    Posted by Legacy on 12/30/2001 12:00am

    Originally posted by: Benny

    Hi, Great work!!! But how can I make the server fire event by broadcasting at intervals?

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Wednesday, September 24, 2014 8:00 AM - 9:00 AM PDT According to a recent Forrester Research report, many companies are choosing low-code platforms over traditional programming platforms, due to the speed with which low-code apps can be assembled and tested. With customer-facing applications on the rise, traditional programming platforms simply can't keep up with the "short schedules and rapid change cycles" required to develop these applications. Check out this upcoming webinar and join Clay Richardson from …

  • As mobile devices have pushed their way into the enterprise, they have brought cloud apps along with them. This app explosion means account passwords are multiplying, which exposes corporate data and leads to help desk calls from frustrated users. This paper will discover how IT can improve user productivity, gain visibility and control over SaaS and mobile apps, and stop password sprawl. Download this white paper to learn: How you can leverage your existing AD to manage app access. Key capabilities to …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds