MS Word Addin C++ COM w/o ATL - Determine what toolbar button was clicked??

I am using C++ and COM without using ATL to write a Word 2003 addin.  I used the MSDN article below as the basis for my for my project.  

http://support.microsoft.com/support/kb/articles/Q230/6/89.ASP

The example only has a single toolbar button so I added several which all get added and initalized fine.  When I click on a button the Invoke method gets called as it should.  My question is how do I tell which button was clicked.  

Help, I am already bald enough...
craig20120Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

jkrCommented:
>>My question is how do I tell which button was clicked.

Since the idea is to instantiate a button handler for each individual button, that should be easy to handle:

 // Now, set up an event sink for the Button...
    m_pButtonHandler = new CButtonHandler();  // <------ Option 1: Pass a button ID to the handler in the construcotr
    if (NULL == m_pButtonHandler) goto cleanup;
    m_pButtonHandler->AddRef();
    m_pButtonHandler->SinkEvents(vtButton.pdispVal);

Alternatively, you can do that in the 'Invoke()' handler:

/******************************************************************
 * CButtonHandler::Invoke()
 *
 *  The click event is fired by this Invoke call. There is only
 *  one event for this interface (0x00000001) and it takes two
 *  parameters:
 *
 *  LPDISPATCH   pCtrl   -- The primary interface of the button
 *                          being pressed.
 *
 *  VARIANT_BOOL bCancel -- Determines whether the default action
 *                          should be cancled.
 *
 ******************************************************************/
STDMETHODIMP CButtonHandler::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS* pDispParams, VARIANT* pVarResult, EXCEPINFO* pExcepInfo, UINT* puArgErr)
{
    if (IID_NULL != riid)
        return DISP_E_UNKNOWNINTERFACE;

    if (dispIdMember != 0x00000001)
        return DISP_E_MEMBERNOTFOUND;

    if (NULL == pDispParams) return E_POINTER;
    if (pDispParams->cArgs != 2) return DISP_E_BADPARAMCOUNT;

    // <---------- Option 2: Obtain 'pCtrl' from 'pDispParams' so you can simply read the button text


 // We don't do anything special with this event, so we'll just pop up
 // a message box to let the user know we are here. For a production
 // addin, you would want to forward the event to a callback function
 // in your main addin class. There your addin could handle the event
 // in a more controled manner.
    MessageBox(NULL, "The Click event was fired!!", "My Addin", MB_SETFOREGROUND);

    return S_OK;
}
0
craig20120Author Commented:
I like option two the best and actually was actually trying to see how to get the pointer to the control before I posted this.  I figured it was in one of the arguments, but I am still not sure how to retrieve pCtrl and get the text.  I am somewhat new to COM programming.  ATL makes more sense to me then straight COM.  

Thanks!
0
jkrCommented:
Hm, like

IDispatch* pButton;

if (pDispParams->rgvarg[0].vt == VT_DISPATCH) {

  pButton = pDispParams->rgvarg[0].pdispVal;

} else {

   // big error, 1st VARIANTARG has to be of type 'VT_DISPATCH' here
}

See also http://msdn2.microsoft.com/en-us/ms891678.aspx ("VARIANT and VARIANTARG")
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Programming

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.