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Understanding COM Event Handling

, 9 Dec 2004 CPOL
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
// EventFiringObject.cpp : Implementation of DLL Exports.


// Note: Proxy/Stub Information
//      To build a separate proxy/stub DLL, 
//      run nmake -f EventFiringObjectps.mk in the project directory.

#include "stdafx.h"
#include "resource.h"
#include <initguid.h>
#include "EventFiringObject.h"

#include "EventFiringObject_i.c"
#include "EventFiringObject_Impl.h"


CComModule _Module;

BEGIN_OBJECT_MAP(ObjectMap)
OBJECT_ENTRY(CLSID_EventFiringObject, CEventFiringObject)
END_OBJECT_MAP()

/////////////////////////////////////////////////////////////////////////////
// DLL Entry Point

extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
{
    if (dwReason == DLL_PROCESS_ATTACH)
    {
        _Module.Init(ObjectMap, hInstance, &LIBID_EVENTFIRINGOBJECTLib);
        DisableThreadLibraryCalls(hInstance);
    }
    else if (dwReason == DLL_PROCESS_DETACH)
        _Module.Term();
    return TRUE;    // ok
}

/////////////////////////////////////////////////////////////////////////////
// Used to determine whether the DLL can be unloaded by OLE

STDAPI DllCanUnloadNow(void)
{
    return (_Module.GetLockCount()==0) ? S_OK : S_FALSE;
}

/////////////////////////////////////////////////////////////////////////////
// Returns a class factory to create an object of the requested type

STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv)
{
    return _Module.GetClassObject(rclsid, riid, ppv);
}

/////////////////////////////////////////////////////////////////////////////
// DllRegisterServer - Adds entries to the system registry

STDAPI DllRegisterServer(void)
{
    // registers object, typelib and all interfaces in typelib
    return _Module.RegisterServer(TRUE);
}

/////////////////////////////////////////////////////////////////////////////
// DllUnregisterServer - Removes entries from the system registry

STDAPI DllUnregisterServer(void)
{
    return _Module.UnregisterServer(TRUE);
}


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

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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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