ArcGIS Engine Developer Guide

VISUAL C++
delete[] pvars; // Clean up the parameter list.
}
VOID Fire_OnMouseUp(LONG button, LONG shift, LONG x, LONG y)
{
// ... Other events
To fire an event from the source, call Fire_OnMouseDown when required.
A similar approach can be used for firing events to a pure COM (non-IDispatch)
interface. The wizard will not generate the connection point class, so this must be
written by hand; the following example illustrates a class that will fire an
ITOCBuddyEvents::ActiveViewReplaced event; ITOCBuddyEvents is a pure COM,
non-IDispatch interface. The key difference is that there is no need to package
the parameters; a direct method call can be made.
template < class T >
class CProxyTOCBuddyEvents : public IConnectionPointImpl< T,
&IID_ITOCBuddyEvents, CComDynamicUnkArray >
{
// This class based on the ATL-generated connection point class
public:
void Fire_ActiveViewReplaced(IActiveView* pNewActiveView)
{
T* pT = static_cast< T* >(this);
int nConnectionIndex;
int nConnections = this->m_vec.GetSize();
for (nConnectionIndex = 0; nConnectionIndex < nConnections;
nConnectionIndex++)
{
pT->Lock();
CComPtr< IUnknown > sp=this->m_vec.GetAt(nConnectionIndex);
pT->Unlock();
ITOCBuddyEvents* pTOCBuddyEvents = reinterpret_cast< ITOCBuddyEvents*
>(sp.p);
if (pTOCBuddyEvents)
pTOCBuddyEvents->ActiveViewReplaced(pNewActiveView);
}
}
};
IDL declarations for an object that supports events
When an object is exported to a type library, the event interfaces are declared by
using the [source] tag against the interface name. For example, an object that fires
ITOCBuddyEvents declares:
[source] interface ITOCBuddyEvents;
If the outbound interface is a dispatch events interface, dispinterface is used instead
of interface. In addition, a coclass can have a default outbound interface;
this is specified with the [default] tag. Default interfaces are identified by some
design environments (for example, Visual Basic 6). Following is the declaration
for the default outbound events interface:
[default, source] dispinterface IMyEvents2;
138 • ArcGIS Engine Developer Guide