You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
455 lines
19 KiB
455 lines
19 KiB
//+-------------------------------------------------------------------------
|
|
//
|
|
// Microsoft Windows
|
|
// Copyright (C) Microsoft Corporation, 1992 - 1999
|
|
//
|
|
// File: scriptevents.h
|
|
//
|
|
// Contents: Implementation of script events thru connection points
|
|
//
|
|
// History: 11-Feb-99 AudriusZ Created
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
/*
|
|
This file provides means to implement connection-point based events with
|
|
the ability to fire them to running scripts. That is an alternative to
|
|
wizard-based implementation provided by ATL.
|
|
|
|
IDEA
|
|
|
|
The idea behind this implementation is to create the class that
|
|
implements the methods from the event interface. Each such method will
|
|
have a string literal equivalent to method name. Whenever such a method
|
|
is called, it will use that string literal to find the dispatch ID of
|
|
the interface method and will use it to forward the call to event sinks.
|
|
|
|
The special measures need to be taken to assure correct mapping of methods,
|
|
proper parameter types and count. The provided implementation puts these
|
|
tasks on the compiler, since it's more accurate than the human. Deriving
|
|
the class from the event interface implemented assures it. To implement
|
|
method mapping the class uses CComTypeInfoHolder defined in ATL
|
|
to do the actual mapping.
|
|
|
|
The benefits come with a price - the event interface needs to be dual
|
|
(while the scripts require it to be dispinterface only) - that requires
|
|
defining 2 interfaces in IDL. Mapping also means slightly increased method
|
|
call time.
|
|
|
|
REQUIREMENTS / USAGE
|
|
|
|
1. You need to define hidden dual interface (with the name constructed by prepending
|
|
underscore to the name of dispinterface) in the IDL file, like this:
|
|
|
|
[
|
|
uuid(YYYYYYYYYYY), dual, helpstring("")
|
|
]
|
|
interface _DocEvents : IDispatch
|
|
{
|
|
[id(1), helpstring("Occurs when a document is initialized")]
|
|
HRESULT OnInitialize( [in] PDOCUMENT pDocument);
|
|
[id(2), helpstring("Occurs when a document is destroyed")]
|
|
HRESULT OnDestroy( [in] PDOCUMENT pDocument);
|
|
};
|
|
|
|
2. You need to define the dispinterface to be used as event source, like
|
|
this:
|
|
|
|
[
|
|
uuid(XXXXXXXXXXX) , helpstring("DocEvents Interface")
|
|
]
|
|
dispinterface DocEvents
|
|
{
|
|
interface _DocEvents;
|
|
};
|
|
|
|
3. Your com object needs to derive from IConnectionPointContainerImpl and
|
|
define CONNECTION_POINT_MAP.
|
|
|
|
4. You need to provide the specialization of the event proxy, mapping all
|
|
the methods from the event interface, like this:
|
|
|
|
DISPATCH_CALL_MAP_BEGIN(DocEvents)
|
|
DISPATCH_CALL1( OnInitialize, PDOCUMENT )
|
|
DISPATCH_CALL1( OnDestroy, PDOCUMENT )
|
|
DISPATCH_CALL_MAP_END()
|
|
|
|
Note: this must be defined at global scope (probably *.h file) and visible
|
|
from wherever ScFireComEvent is executed.
|
|
|
|
5. (optional) If any of the parameters in the event interface refers to
|
|
coclass in IDL, you need to map (cast) the types to the interface
|
|
pointer inside the proxy, like this:
|
|
|
|
DISPATCH_CALL_MAP_BEGIN(DocEvents)
|
|
DISPATCH_PARAM_CAST ( PDOCUMENT, IDispatch * );
|
|
DISPATCH_CALL1( OnInitialize, PDOCUMENT )
|
|
DISPATCH_CALL1( OnDestroy, PDOCUMENT )
|
|
DISPATCH_CALL_MAP_END()
|
|
|
|
6. where needed you may fire the evens like this:
|
|
|
|
sc = ScFireComEvent(m_sp_Document, DocEvents , OnDestroy(pDocument));
|
|
|
|
7. to avoid creating com objects (parameters to events) when there is no one
|
|
interested in receiving them use ScHasSinks macro:
|
|
|
|
sc = ScHasSinks(m_sp_Document, DocEvents);
|
|
if (sc == SC(S_OK))
|
|
{
|
|
// create com objects and fire the event
|
|
}
|
|
|
|
|
|
COMPARISON this ATL
|
|
|
|
Manual changes yes semi
|
|
|
|
Dual interface required not required
|
|
|
|
Call to method 1st time Maps the name direct
|
|
|
|
Type library required at runtime only to generate
|
|
|
|
After method is added require to add Require to regenerate
|
|
the method to proxy proxy file
|
|
|
|
After disp ID is changed no changes Require to regen.
|
|
|
|
Compiling changed IDL Won't compile if proxy Fail on runtime
|
|
doesn't fit interface
|
|
|
|
fire from anywhere from proxy only
|
|
|
|
coclass param casting provides not support
|
|
|
|
USED CLASS HIERARCHY
|
|
|
|
CEventDispatcherBase [ type-invariant stuff]
|
|
/\
|
|
||
|
|
CEventDispatcher<_dual_interface> [ interface type parametrized stuff]
|
|
/\
|
|
||
|
|
CEventProxy<_dispinterface> [ client provided call map defines this]
|
|
/\
|
|
||
|
|
CScriptEvent<_dispinterface> [ this one gets instantiated by ScFireComEvent ]
|
|
|
|
*/
|
|
|
|
#include "eventlock.h"
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* CLASS: CEventDispatcherBase
|
|
*
|
|
* PURPOSE: base class for CEventDispatcher template
|
|
* implements functionality not dependant on template parameters
|
|
*
|
|
\***************************************************************************/
|
|
class CEventDispatcherBase
|
|
{
|
|
protected:
|
|
// c-tor
|
|
CEventDispatcherBase() : m_bEventSourceExists(false) {}
|
|
|
|
// Parameter cast template
|
|
// Provided to allow parameter casting for parameters of specified types
|
|
// in proxy using DISPATCH_PARAM_CAST macro.
|
|
// Default (specified here) casts every type to itself
|
|
template <typename _param_type>
|
|
struct ParamCast
|
|
{
|
|
typedef _param_type PT;
|
|
};
|
|
|
|
// Parameter cast function (see comment above)
|
|
template <typename _param_type>
|
|
inline typename ParamCast<_param_type>::PT& CastParam(_param_type& arg) const
|
|
{
|
|
return reinterpret_cast<ParamCast<_param_type>::PT&>(arg);
|
|
}
|
|
|
|
// sets connection point container to be used to forward events
|
|
void SetContainer(LPUNKNOWN pComObject);
|
|
// forward the call using IDispatch of event sinks
|
|
SC ScInvokeOnConnections(const REFIID riid, DISPID dispid, CComVariant *pVar, int count, CEventBuffer& buffer) const;
|
|
|
|
// returns S_FALSE if no sinks are registered with the object.
|
|
SC ScHaveSinksRegisteredForInterface(const REFIID riid);
|
|
|
|
private:
|
|
// there are two options: com object does not exist (that's ok)
|
|
// and it does not implement container (error)
|
|
// we have 2 variables to deal with both situations
|
|
bool m_bEventSourceExists;
|
|
IConnectionPointContainerPtr m_spContainer;
|
|
};
|
|
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* CLASS: CEventDispatcher
|
|
*
|
|
* PURPOSE: Fully equipped call dispather
|
|
* Main functionality of it is to implement ScMapMethodToID
|
|
* and ScInvokeOnConnections - two functions required to call
|
|
* method by name thru IDispatch::Invoke()
|
|
* They are use by DISPATCH_CALL# macros
|
|
*
|
|
\***************************************************************************/
|
|
template <typename _dual_interface>
|
|
class CEventDispatcher : public CEventDispatcherBase
|
|
{
|
|
protected:
|
|
typedef _dual_interface DualIntf;
|
|
// Maps method name to dispId; Employs CComTypeInfoHolder to do the job
|
|
SC ScMapMethodToID(LPCWSTR strMethod, DISPID& dispid)
|
|
{
|
|
DECLARE_SC(sc, TEXT("ScMapMethodToID"));
|
|
|
|
// this cast is needed just because of bad parameter type defined in GetIDsOfNames
|
|
LPOLESTR strName = const_cast<LPOLESTR>(strMethod);
|
|
// rely on CComTypeInfoHolder to do it
|
|
sc = m_TypeInfo.GetIDsOfNames( IID_NULL, &strName, 1, LOCALE_NEUTRAL, &dispid );
|
|
if (sc)
|
|
return sc;
|
|
|
|
return sc;
|
|
}
|
|
|
|
private:
|
|
// be aware - this member depents on template parameter
|
|
static CComTypeInfoHolder m_TypeInfo;
|
|
};
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* CEventDispatcher static member initialization
|
|
*
|
|
\***************************************************************************/
|
|
|
|
const WORD wVersionMajor = 1;
|
|
const WORD wVersionMinor = 0;
|
|
|
|
template <typename _dual_interface>
|
|
CComTypeInfoHolder CEventDispatcher<_dual_interface>::m_TypeInfo =
|
|
{ &__uuidof(_dual_interface), &LIBID_MMC20, wVersionMajor, wVersionMinor, NULL, 0, NULL, 0 };
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* CLASS: CEventProxy
|
|
*
|
|
* PURPOSE: Every event interface should have specialization of this class,
|
|
* describing mapped (dual interface - to - dispinterface) methods.
|
|
* Here it is just declared - not defined.
|
|
*
|
|
\***************************************************************************/
|
|
template <typename _dispinterface> class CEventProxy;
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* CLASS: CScriptEvent
|
|
*
|
|
* PURPOSE: The object that will be constructed to fire actual event.
|
|
* It is provided solely to do initialization by constuctor,
|
|
* coz that allowes us to use single unnamed object in the single
|
|
* statement to both construct it and invoke a method on it.
|
|
*
|
|
\***************************************************************************/
|
|
template <typename _dispinterface>
|
|
class CScriptEvent: public CEventProxy<_dispinterface>
|
|
{
|
|
public:
|
|
CScriptEvent(LPUNKNOWN pComObject)
|
|
{
|
|
SetContainer(pComObject);
|
|
}
|
|
// returns S_FALSE if no sinks are registered with the object.
|
|
SC ScHaveSinksRegistered()
|
|
{
|
|
return ScHaveSinksRegisteredForInterface(__uuidof(_dispinterface));
|
|
}
|
|
};
|
|
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACROS USED TO IMPLEMENT EVENT PROXY
|
|
*
|
|
\***************************************************************************/
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL_MAP_BEGIN
|
|
*
|
|
* defines the begining of the call map.
|
|
* NOTE : assumes that dual interface has the same name as the dispinterface
|
|
* with single '_' prepended
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL_MAP_BEGIN(_dispinterface) \
|
|
template<> class CEventProxy<_dispinterface> : public CEventDispatcher<_##_dispinterface> {
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL_MAP_END
|
|
*
|
|
* defines the end of the call map.
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL_MAP_END() };
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_PARAM_CAST
|
|
*
|
|
* defines type mapping to be used prior to IDispatch::Invoke
|
|
* It is provided to deal with objects defined as coclass
|
|
* in IDL file, which cannot implecitly be converted to any interface.
|
|
* ( if we do not change it CComVariant will treat it as bool type )
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_PARAM_CAST(from,to) \
|
|
public: template <> struct CEventDispatcherBase::ParamCast<from> { typedef to PT; }
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL_PROLOG
|
|
*
|
|
* used as first part of every DISPATCH_CALL# macro
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL_PROLOG(_method, _param_list) \
|
|
/* Implement pure method to be able to instantiate the class */ \
|
|
/* it should not be used - so it's declared private */ \
|
|
private: STDMETHOD(_method) _param_list \
|
|
{ \
|
|
/* retrieving the pointer to base won't compile if method is */ \
|
|
/* removed from the interface (that's what we want to catch) */ \
|
|
HRESULT (STDMETHODCALLTYPE DualIntf::*pm)_param_list = DualIntf::_method; \
|
|
return E_NOTIMPL; \
|
|
} \
|
|
/* Implement invocation in Sc* method used by SC_FIRE* macro */ \
|
|
/* _param_list represents parameter list with brackets */ \
|
|
public: SC Sc##_method _param_list { \
|
|
DECLARE_SC(sc, TEXT("DISPATCH_CALL::Sc") TEXT(#_method)); \
|
|
/* following lines gets dispid on the first call only. */ \
|
|
/* succeeding calls will reuse it or error from the 1st call */ \
|
|
static DISPID dispid = 0; \
|
|
static SC sc_map = ScMapMethodToID(L#_method, dispid); \
|
|
if (sc_map) return sc = sc_map;
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL_EPILOG
|
|
*
|
|
* used as last part of every DISPATCH_CALL# macro
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL_EPILOG(_dispinterface, _pvar, _count) \
|
|
/* Get the proper event buffer for locked scenarios */ \
|
|
CEventBuffer& buffer = GetEventBuffer(); \
|
|
/* just invoke the method on the sinks */ \
|
|
return sc = ScInvokeOnConnections(__uuidof(_dispinterface), dispid, _pvar, _count, buffer); }
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL0
|
|
*
|
|
* used to map an event interface method with 0 parameters
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL0(_dispinterface, _method) \
|
|
DISPATCH_CALL_PROLOG(_method, ()) \
|
|
DISPATCH_CALL_EPILOG(_dispinterface, NULL, 0)
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL1
|
|
*
|
|
* used to map an event interface method with 1 parameter
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL1(_dispinterface, _method, P1) \
|
|
DISPATCH_CALL_PROLOG(_method, (P1 param1)) \
|
|
CComVariant var[] = { CastParam(param1) }; \
|
|
DISPATCH_CALL_EPILOG(_dispinterface, var, countof(var))
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL2
|
|
*
|
|
* used to map an event interface method with 2 parameters
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL2(_dispinterface, _method, P1, P2) \
|
|
DISPATCH_CALL_PROLOG(_method, (P1 param1, P2 param2)) \
|
|
CComVariant var[] = { CastParam(param2), CastParam(param1) }; \
|
|
DISPATCH_CALL_EPILOG(_dispinterface, var, countof(var))
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL3
|
|
*
|
|
* used to map an event interface method with 3 parameters
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL3(_dispinterface, _method, P1, P2, P3) \
|
|
DISPATCH_CALL_PROLOG(_method, (P1 param1, P2 param2, P3 param3)) \
|
|
CComVariant var[] = { CastParam(param3), CastParam(param2), CastParam(param1) }; \
|
|
DISPATCH_CALL_EPILOG(_dispinterface, var, countof(var))
|
|
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL4
|
|
*
|
|
* used to map an event interface method with 4 parameters
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL4(_dispinterface, _method, P1, P2, P3, P4) \
|
|
DISPATCH_CALL_PROLOG(_method, (P1 param1, P2 param2, P3 param3, P4 param4)) \
|
|
CComVariant var[] = { CastParam(param4), CastParam(param3), CastParam(param2), CastParam(param1) }; \
|
|
DISPATCH_CALL_EPILOG(_dispinterface, var, countof(var))
|
|
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: DISPATCH_CALL5
|
|
*
|
|
* used to map an event interface method with 5 parameters
|
|
*
|
|
\***************************************************************************/
|
|
#define DISPATCH_CALL5(_dispinterface, _method, P1, P2, P3, P4, P5) \
|
|
DISPATCH_CALL_PROLOG(_method, (P1 param1, P2 param2, P3 param3, P4 param4, P5 param5)) \
|
|
CComVariant var[] = { CastParam(param5), CastParam(param4), CastParam(param3), CastParam(param2), CastParam(param1) }; \
|
|
DISPATCH_CALL_EPILOG(_dispinterface, var, countof(var))
|
|
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: ScFireComEvent
|
|
*
|
|
* used to fire script event. Note that _p_com_object may be NULL
|
|
*
|
|
\***************************************************************************/
|
|
#ifdef DBG
|
|
extern CTraceTag tagComEvents;
|
|
#endif
|
|
|
|
#define ScFireComEvent(_p_com_object, _dispinterface, _function_call) \
|
|
CScriptEvent<_dispinterface>(_p_com_object).Sc##_function_call; \
|
|
Trace(tagComEvents, _T(#_function_call));
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* MACRO: ScHasSinks
|
|
*
|
|
* used to determine if there are sinks connected
|
|
* ( to avoid creating com object when ScFireComEvent would result in no calls )
|
|
*
|
|
\***************************************************************************/
|
|
#define ScHasSinks(_p_com_object, _dispinterface) \
|
|
((_p_com_object) == NULL) ? SC(S_FALSE) : \
|
|
CScriptEvent<_dispinterface>(_p_com_object).ScHaveSinksRegistered();
|
|
|