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#ifndef TEVENT_HANDLER_H
#define TEVENT_HANDLER_H
#include <windows.h>
//#include <SHLOBJ.H>
//#include <memory>
//#include <string>
namespace TEventHandlerNamespace
{
// Generic event handler template class (especially useful (but not limited to) for non-ATL clients).
template <class event_handler_class, typename device_interface, typename device_event_interface>
class TEventHandler : IDispatch
{
friend class class_event_handler;
typedef HRESULT (event_handler_class::*parent_on_invoke)
(
TEventHandler<event_handler_class, device_interface, device_event_interface>* pthis,
DISPID dispidMember,
REFIID riid,
LCID lcid,
WORD wFlags,
DISPPARAMS* pdispparams,
VARIANT* pvarResult,
EXCEPINFO* pexcepinfo,
UINT* puArgErr
);
public :
TEventHandler
(
event_handler_class& parent,
device_interface* pdevice_interface, // Non-ref counted.
parent_on_invoke parent_on_invoke_function
) :
m_cRef(1),
m_parent(parent),
m_parent_on_invoke(parent_on_invoke_function),
m_pIConnectionPoint(0),
m_dwEventCookie(0)
{
SetupConnectionPoint(pdevice_interface);
}
~TEventHandler()
{
// Call ShutdownConnectionPoint() here JUST IN CASE connection points are still
// alive at this time. They should have been disconnected earlier.
ShutdownConnectionPoint();
}
STDMETHOD_(ULONG, AddRef)()
{
InterlockedIncrement(&m_cRef);
return m_cRef;
}
STDMETHOD_(ULONG, Release)()
{
InterlockedDecrement(&m_cRef);
if (m_cRef == 0)
{
delete this;
return 0;
}
return m_cRef;
}
STDMETHOD(QueryInterface)(REFIID riid, void ** ppvObject)
{
if (riid == IID_IUnknown)
{
*ppvObject = (IUnknown*)this;
AddRef();
return S_OK;
}
if ((riid == IID_IDispatch) || (riid == __uuidof(device_event_interface)))
{
*ppvObject = (IDispatch*)this;
AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
STDMETHOD(GetTypeInfoCount)(UINT* pctinfo)
{
return E_NOTIMPL;
}
STDMETHOD(GetTypeInfo)(UINT itinfo, LCID lcid, ITypeInfo** pptinfo)
{
return E_NOTIMPL;
}
STDMETHOD(GetIDsOfNames)(REFIID riid, LPOLESTR* rgszNames, UINT cNames,
LCID lcid, DISPID* rgdispid)
{
return E_NOTIMPL;
}
STDMETHOD(Invoke)(DISPID dispidMember, REFIID riid,
LCID lcid, WORD wFlags, DISPPARAMS* pdispparams, VARIANT* pvarResult,
EXCEPINFO* pexcepinfo, UINT* puArgErr)
{
return (m_parent.*m_parent_on_invoke)(this, dispidMember, riid, lcid, wFlags, pdispparams, pvarResult, pexcepinfo, puArgErr);
}
protected :
LONG m_cRef;
// Pertaining to the owner of this object.
event_handler_class& m_parent; // Non-reference counted. This is to prevent circular references.
// Pertaining to connection points.
IConnectionPoint* m_pIConnectionPoint; // Ref counted of course.
DWORD m_dwEventCookie;
parent_on_invoke m_parent_on_invoke;
void SetupConnectionPoint(device_interface* pdevice_interface)
{
IConnectionPointContainer* pIConnectionPointContainerTemp = NULL;
IUnknown* pIUnknown = NULL;
// QI this object itself for its IUnknown pointer which will be used
// later to connect to the Connection Point of the device_interface object.
this -> QueryInterface(IID_IUnknown, (void**)&pIUnknown);
if (pIUnknown)
{
// QI the pdevice_interface for its connection point.
pdevice_interface -> QueryInterface (IID_IConnectionPointContainer, (void**)&pIConnectionPointContainerTemp);
if (pIConnectionPointContainerTemp)
{
pIConnectionPointContainerTemp -> FindConnectionPoint(__uuidof(device_event_interface), &m_pIConnectionPoint);
pIConnectionPointContainerTemp -> Release();
pIConnectionPointContainerTemp = NULL;
}
if (m_pIConnectionPoint)
{
m_pIConnectionPoint -> Advise(pIUnknown, &m_dwEventCookie);
}
pIUnknown -> Release();
pIUnknown = NULL;
}
}
public :
void ShutdownConnectionPoint()
{
if (m_pIConnectionPoint)
{
m_pIConnectionPoint -> Unadvise(m_dwEventCookie);
m_dwEventCookie = 0;
m_pIConnectionPoint -> Release();
m_pIConnectionPoint = NULL;
}
}
};
};
#endif |
