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Placing an icon in the system tray from an ATL COM server - with minimum hassle

, 23 Jun 2002
This article describes a helper class that assists with placing an icon in the shell (aka "system tray"), and changing the tip text. You can get this functionality by simply deriving your ATL object from the helper class.
Icon1.ico
icon2.ico
icon3.ico
icon4.ico
MyServer.rgs
SystemTrayDemo.def
SystemTrayDemo.dsp
SystemTrayDemo.dsw
SystemTrayDemo.opt
SystemTrayDemops.def
SystemTrayDemops.mk
ShellTest.vbw
ShellTest.exe
ShellTest.frm
ShellTest.vbp
MSSCCPRJ.SCC
// SystemTrayDemo.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 SystemTrayDemo.idl by adding the following 
//      files to the Outputs.
//          SystemTrayDemo_p.c
//          dlldata.c
//      To build a separate proxy/stub DLL, 
//      run nmake -f SystemTrayDemops.mk in the project directory.

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

#include "SystemTrayDemo_i.c"
#include "MyServer.h"

#ifdef _MERGE_PROXYSTUB
extern "C" HINSTANCE hProxyDll;
#endif

CComModule _Module;

BEGIN_OBJECT_MAP(ObjectMap)
OBJECT_ENTRY(CLSID_MyServer, CMyServer)
END_OBJECT_MAP()

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

extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
    lpReserved;
#ifdef _MERGE_PROXYSTUB
    if (!PrxDllMain(hInstance, dwReason, lpReserved))
        return FALSE;
#endif
    if (dwReason == DLL_PROCESS_ATTACH)
    {
        _Module.Init(ObjectMap, hInstance, &LIBID_SYSTEMTRAYDEMOLib);
        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)
{
#ifdef _MERGE_PROXYSTUB
    if (PrxDllCanUnloadNow() != S_OK)
        return S_FALSE;
#endif
    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)
{
#ifdef _MERGE_PROXYSTUB
    if (PrxDllGetClassObject(rclsid, riid, ppv) == S_OK)
        return S_OK;
#endif
    return _Module.GetClassObject(rclsid, riid, ppv);
}

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

STDAPI DllRegisterServer(void)
{
#ifdef _MERGE_PROXYSTUB
    HRESULT hRes = PrxDllRegisterServer();
    if (FAILED(hRes))
        return hRes;
#endif
    // registers object, typelib and all interfaces in typelib
    return _Module.RegisterServer(TRUE);
}

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

STDAPI DllUnregisterServer(void)
{
#ifdef _MERGE_PROXYSTUB
    PrxDllUnregisterServer();
#endif
    return _Module.UnregisterServer(TRUE);
}


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About the Author

Jon Taylor
Web Developer
United Kingdom United Kingdom
I first started tinkering with a ZX81 back in 1981 and it's lovely blocky graphics, teaching myself Z80 assembler and BASIC. I come from a hardware background and electronics - I started out in embedded software for avionics but soon moved onto PC platforms.

Java and C++ are my prefered language but also dabble in VB and .NET.

I'm a team leader with Nokia developing Series 40 features - it's a cool place to work!

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