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Building an Office2K COM addin with VC++/ATL

, 30 Apr 2003
This article shows how to program an Outlook2000/2K+ COM addin using a pure ATL COM object.
//	Copyright : Amit Dey 2002
//	Email
//	This code may be used in compiled form in any way you desire. This
//	file may be redistributed unmodified by any means PROVIDING it is 
//	not sold for profit without the authors written consent, and 
//	providing that this notice and the authors name is included.
//	This file is provided 'as is' with no expressed or implied warranty.
//	The author accepts no liability if it causes any damage to your computer.
//	Do expect bugs.
//	Please let me know of any bugs/mods/improvements.
//	and I will try to fix/incorporate them into this file.
//	Enjoy!
//	Description : Outlook2K Addin 

// OutlookAddin.cpp : Implementation of DLL Exports.

// Note: Proxy/Stub Information
//      To merge the proxy/stub code into the object DLL, add the file 
//      dlldatax.c to the project.  Make sure precompiled headers 
//      are turned off for this file, and add _MERGE_PROXYSTUB to the 
//      defines for the project.  
//      If you are not running WinNT4.0 or Win95 with DCOM, then you
//      need to remove the following define from dlldatax.c
//      #define _WIN32_WINNT 0x0400
//      Further, if you are running MIDL without /Oicf switch, you also 
//      need to remove the following define from dlldatax.c.
//      #define USE_STUBLESS_PROXY
//      Modify the custom build rule for OutlookAddin.idl by adding the following 
//      files to the Outputs.
//          OutlookAddin_p.c
//          dlldata.c
//      To build a separate proxy/stub DLL, 
//      run nmake -f in the project directory.

#include "stdafx.h"
#include "resource.h"
#include <initguid.h>
#include "OutlookAddin.h"
#include "dlldatax.h"

#include "OutlookAddin_i.c"
#include "Addin.h"
#include "PropPage.h"
#include "LitePage.h"

extern "C" HINSTANCE hProxyDll;

CComModule _Module;


// DLL Entry Point

extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
    if (!PrxDllMain(hInstance, dwReason, lpReserved))
        return FALSE;
    if (dwReason == DLL_PROCESS_ATTACH)
        _Module.Init(ObjectMap, hInstance, &LIBID_OUTLOOKADDINLib);
    else if (dwReason == DLL_PROCESS_DETACH)
    return TRUE;    // ok

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

STDAPI DllCanUnloadNow(void)
    if (PrxDllCanUnloadNow() != S_OK)
        return S_FALSE;
    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)
    if (PrxDllGetClassObject(rclsid, riid, ppv) == S_OK)
        return S_OK;
    return _Module.GetClassObject(rclsid, riid, ppv);

// DllRegisterServer - Adds entries to the system registry

STDAPI DllRegisterServer(void)
    HRESULT hRes = PrxDllRegisterServer();
    if (FAILED(hRes))
        return hRes;
    // 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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About the Author

Amit Dey
Web Developer
India India
Amit Dey is a freelance programmer from Bangalore,India. Chiefly programming VC++/MFC, ATL/COM and PocketPC and Palm platforms. Apart from programming and CP, he is a self-taught guitar and keyboard player.

He can be contacted at

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