I thaught this thread wasn't necessary, but after reading some articles here, I finally decided to open a new thread anyway.

I've read this forum: Catch mappoint events using C++ (without MFC...)

But still have one problem and that is:

Code:

OnSelectionChangeControlMap(LPDISPATCH pNewSelection, LPDISPATCH pOldSelection) 
{
    //HRESULT hr = pNewSelection->QueryInterface(__uuidof(Pushpin), 

    // Get old selection - if it is a pushpin, hide the notes/caption
    if (pOldSelection)
    {
        CPushpin *pOldPin;
        HRESULT hr = pOldSelection->QueryInterface( __uuidof(CPushpin)  , (void**)&pOldPin);
        if (SUCCEEDED(hr))
        {
            //some codeprocessing
        }
    }

    // Get new selection - if it is a pushpin, display notes/caption and modify it    
    if (pNewSelection)
    {
        CPushpin *pNewPin;
        HRESULT hr = pNewSelection->QueryInterface( __uuidof(CPushpin)  , (void**)&pNewPin);
        if (SUCCEEDED(hr))
        {
            //some coding
            //some coding agian ;)
        }
    }

}

and the compilor-error is:

Code:

 'CPushpin' : no GUID has been associated with this object
 'CPushpin' : no GUID has been associated with this object

In the forum I've read, they used Pushpin instead of CPushpin.
I also tried with 'Pushpin', but it didn't matter.
So does someone know how to get the right GUID of Pushpin?? I'm not a specialist in COM, only understand what's going on a little.

Hi,

I assume you have to find it in some #include file. But I never worked with MapPoint in VC++, so someone else has to drop in here.

I've solved the problem, maybe someone else can use it too!
Wtih __uuidof(GUID), this function needs some reference to find out what the GUID is. In Google you can find what GUID is (is a unique ID for a com-object or interface ID of an object: GlobalUniqueIDentifier). Anyway, in my previous snippet of code it needs the ID of Pushpin object.

What I did was give the function __uuidof() the parameter of the class CPushpin, or an instance of CPushpin. But CPushpin has a member pointer to a Dispatch of the Pushpin COM object. Actually, CPushpin is a wrapperclass of Pushpin COM object, I mean in C++/VC++. So you need the member CPushpin::m_lpDispatch to get to the interfaces of Pushpin COM object.


Anyway, the result is: __uuidof(Pushpin::m_lpDispatch)

Good luck!
Btw, thanks Wilfried

Hi,

Thank you also for feedback as this for sure benefit others.