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Understanding COM Event Handling

, 9 Dec 2004
Learn the fundamental principles of COM Event Handling via a C++ template class that allows for generic handling of dispinterface COM events.
teventhandler_src.zip
TEventHandler
EventFiringObject
TestClient
EventFiringObject.def
EventFiringObject.dsp
EventFiringObject.dsw
EventFiringObject.rgs
EventFiringObject.tlb
EventFiringObjectps.def
EventFiringObjectps.mk
EventFiringObject.tlh
EventFiringObject.tli
res
TestClient.clw
TestClient.dsp
TestClient.dsw
TestClient.ico
/* this ALWAYS GENERATED file contains the proxy stub code */


/* File created by MIDL compiler version 5.01.0164 */
/* at Thu Dec 09 16:26:09 2004
 */
/* Compiler settings for F:\Limbl\Develope\CodeProject\TEventHandler\EventFiringObject\EventFiringObject.idl:
    Oicf (OptLev=i2), W1, Zp8, env=Win32, ms_ext, c_ext
    error checks: allocation ref bounds_check enum stub_data 
*/
//@@MIDL_FILE_HEADING(  )

#define USE_STUBLESS_PROXY


/* verify that the <rpcproxy.h> version is high enough to compile this file*/
#ifndef __REDQ_RPCPROXY_H_VERSION__
#define __REQUIRED_RPCPROXY_H_VERSION__ 440
#endif


#include "rpcproxy.h"
#ifndef __RPCPROXY_H_VERSION__
#error this stub requires an updated version of <rpcproxy.h>
#endif // __RPCPROXY_H_VERSION__


#include "EventFiringObject.h"

#define TYPE_FORMAT_STRING_SIZE   3                                 
#define PROC_FORMAT_STRING_SIZE   29                                

typedef struct _MIDL_TYPE_FORMAT_STRING
    {
    short          Pad;
    unsigned char  Format[ TYPE_FORMAT_STRING_SIZE ];
    } MIDL_TYPE_FORMAT_STRING;

typedef struct _MIDL_PROC_FORMAT_STRING
    {
    short          Pad;
    unsigned char  Format[ PROC_FORMAT_STRING_SIZE ];
    } MIDL_PROC_FORMAT_STRING;


extern const MIDL_TYPE_FORMAT_STRING __MIDL_TypeFormatString;
extern const MIDL_PROC_FORMAT_STRING __MIDL_ProcFormatString;


/* Object interface: IUnknown, ver. 0.0,
   GUID={0x00000000,0x0000,0x0000,{0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}} */


/* Object interface: IDispatch, ver. 0.0,
   GUID={0x00020400,0x0000,0x0000,{0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}} */


/* Object interface: IEventFiringObject, ver. 0.0,
   GUID={0x8E396CC0,0xA266,0x481E,{0xB6,0xB4,0x0C,0xB5,0x64,0xDA,0xA3,0xBC}} */


extern const MIDL_STUB_DESC Object_StubDesc;


extern const MIDL_SERVER_INFO IEventFiringObject_ServerInfo;

#pragma code_seg(".orpc")

static const MIDL_STUB_DESC Object_StubDesc = 
    {
    0,
    NdrOleAllocate,
    NdrOleFree,
    0,
    0,
    0,
    0,
    0,
    __MIDL_TypeFormatString.Format,
    1, /* -error bounds_check flag */
    0x20000, /* Ndr library version */
    0,
    0x50100a4, /* MIDL Version 5.1.164 */
    0,
    0,
    0,  /* notify & notify_flag routine table */
    1,  /* Flags */
    0,  /* Reserved3 */
    0,  /* Reserved4 */
    0   /* Reserved5 */
    };

static const unsigned short IEventFiringObject_FormatStringOffsetTable[] = 
    {
    (unsigned short) -1,
    (unsigned short) -1,
    (unsigned short) -1,
    (unsigned short) -1,
    0
    };

static const MIDL_SERVER_INFO IEventFiringObject_ServerInfo = 
    {
    &Object_StubDesc,
    0,
    __MIDL_ProcFormatString.Format,
    &IEventFiringObject_FormatStringOffsetTable[-3],
    0,
    0,
    0,
    0
    };

static const MIDL_STUBLESS_PROXY_INFO IEventFiringObject_ProxyInfo =
    {
    &Object_StubDesc,
    __MIDL_ProcFormatString.Format,
    &IEventFiringObject_FormatStringOffsetTable[-3],
    0,
    0,
    0
    };

CINTERFACE_PROXY_VTABLE(8) _IEventFiringObjectProxyVtbl = 
{
    &IEventFiringObject_ProxyInfo,
    &IID_IEventFiringObject,
    IUnknown_QueryInterface_Proxy,
    IUnknown_AddRef_Proxy,
    IUnknown_Release_Proxy ,
    0 /* (void *)-1 /* IDispatch::GetTypeInfoCount */ ,
    0 /* (void *)-1 /* IDispatch::GetTypeInfo */ ,
    0 /* (void *)-1 /* IDispatch::GetIDsOfNames */ ,
    0 /* IDispatch_Invoke_Proxy */ ,
    (void *)-1 /* IEventFiringObject::TestFunction */
};


static const PRPC_STUB_FUNCTION IEventFiringObject_table[] =
{
    STUB_FORWARDING_FUNCTION,
    STUB_FORWARDING_FUNCTION,
    STUB_FORWARDING_FUNCTION,
    STUB_FORWARDING_FUNCTION,
    NdrStubCall2
};

CInterfaceStubVtbl _IEventFiringObjectStubVtbl =
{
    &IID_IEventFiringObject,
    &IEventFiringObject_ServerInfo,
    8,
    &IEventFiringObject_table[-3],
    CStdStubBuffer_DELEGATING_METHODS
};

#pragma data_seg(".rdata")

#if !defined(__RPC_WIN32__)
#error  Invalid build platform for this stub.
#endif

#if !(TARGET_IS_NT40_OR_LATER)
#error You need a Windows NT 4.0 or later to run this stub because it uses these features:
#error   -Oif or -Oicf, more than 32 methods in the interface.
#error However, your C/C++ compilation flags indicate you intend to run this app on earlier systems.
#error This app will die there with the RPC_X_WRONG_STUB_VERSION error.
#endif


static const MIDL_PROC_FORMAT_STRING __MIDL_ProcFormatString =
    {
        0,
        {

	/* Procedure TestFunction */

			0x33,		/* FC_AUTO_HANDLE */
			0x6c,		/* Old Flags:  object, Oi2 */
/*  2 */	NdrFcLong( 0x0 ),	/* 0 */
/*  6 */	NdrFcShort( 0x7 ),	/* 7 */
#ifndef _ALPHA_
/*  8 */	NdrFcShort( 0xc ),	/* x86, MIPS, PPC Stack size/offset = 12 */
#else
			NdrFcShort( 0x18 ),	/* Alpha Stack size/offset = 24 */
#endif
/* 10 */	NdrFcShort( 0x8 ),	/* 8 */
/* 12 */	NdrFcShort( 0x8 ),	/* 8 */
/* 14 */	0x4,		/* Oi2 Flags:  has return, */
			0x2,		/* 2 */

	/* Parameter lValue */

/* 16 */	NdrFcShort( 0x48 ),	/* Flags:  in, base type, */
#ifndef _ALPHA_
/* 18 */	NdrFcShort( 0x4 ),	/* x86, MIPS, PPC Stack size/offset = 4 */
#else
			NdrFcShort( 0x8 ),	/* Alpha Stack size/offset = 8 */
#endif
/* 20 */	0x8,		/* FC_LONG */
			0x0,		/* 0 */

	/* Return value */

/* 22 */	NdrFcShort( 0x70 ),	/* Flags:  out, return, base type, */
#ifndef _ALPHA_
/* 24 */	NdrFcShort( 0x8 ),	/* x86, MIPS, PPC Stack size/offset = 8 */
#else
			NdrFcShort( 0x10 ),	/* Alpha Stack size/offset = 16 */
#endif
/* 26 */	0x8,		/* FC_LONG */
			0x0,		/* 0 */

			0x0
        }
    };

static const MIDL_TYPE_FORMAT_STRING __MIDL_TypeFormatString =
    {
        0,
        {
			NdrFcShort( 0x0 ),	/* 0 */

			0x0
        }
    };

const CInterfaceProxyVtbl * _EventFiringObject_ProxyVtblList[] = 
{
    ( CInterfaceProxyVtbl *) &_IEventFiringObjectProxyVtbl,
    0
};

const CInterfaceStubVtbl * _EventFiringObject_StubVtblList[] = 
{
    ( CInterfaceStubVtbl *) &_IEventFiringObjectStubVtbl,
    0
};

PCInterfaceName const _EventFiringObject_InterfaceNamesList[] = 
{
    "IEventFiringObject",
    0
};

const IID *  _EventFiringObject_BaseIIDList[] = 
{
    &IID_IDispatch,
    0
};


#define _EventFiringObject_CHECK_IID(n)	IID_GENERIC_CHECK_IID( _EventFiringObject, pIID, n)

int __stdcall _EventFiringObject_IID_Lookup( const IID * pIID, int * pIndex )
{
    
    if(!_EventFiringObject_CHECK_IID(0))
        {
        *pIndex = 0;
        return 1;
        }

    return 0;
}

const ExtendedProxyFileInfo EventFiringObject_ProxyFileInfo = 
{
    (PCInterfaceProxyVtblList *) & _EventFiringObject_ProxyVtblList,
    (PCInterfaceStubVtblList *) & _EventFiringObject_StubVtblList,
    (const PCInterfaceName * ) & _EventFiringObject_InterfaceNamesList,
    (const IID ** ) & _EventFiringObject_BaseIIDList,
    & _EventFiringObject_IID_Lookup, 
    1,
    2,
    0, /* table of [async_uuid] interfaces */
    0, /* Filler1 */
    0, /* Filler2 */
    0  /* Filler3 */
};

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Lim Bio Liong
Web Developer
Singapore Singapore
Lim Bio Liong is a Specialist at a leading Software House in Singapore.
 
Bio has been in software development for over 10 years. He specialises in C/C++ programming and Windows software development.
 
Bio has also done device-driver development and enjoys low-level programming. Bio has recently picked up C# programming and has been researching in this area.

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