Thank you for responding to my query. I always appreciate it when people take the time to help. The Run() method in AtlServiceModule calls this method void RunMessageLoop() throw() { MSG msg; while (GetMessage(&msg, 0, 0, 0) > 0) { TranslateMessage(&msg); DispatchMessage(&msg); } } and I have checked and made sure this is being hit. As to only using a timer, my service is instantiating a COM object that uses WinSock messages (that weren't processed either). I have since written my own WinSock module that uses overlapped IO, but I am rather stubborn and would like to know WHY this code doesn't work. Timers worked fine in a service generated under VC6. Again, I'd like to thank the people that have responded to my query. I posted the same question in a newsgroup and no one responded.

Thanks for the response. The ATL service code includes 3 methods PreMessageLoop(); RunMessageLoop(); PostMessageLoop(); Which lead me to think (incorrectly?) that this should work. It worked with the ATL code with version 6.0, although a lot of the code that had been explicitely generated before is now contained in CAtlServiceModuleT.

Can anyone tell me what (obvious to everyone else) piece I'm missing? The following code doesn't work when run as a service. It runs fine when run through the IDE. All it does is set a timer. The SetTimer returns a valid number, but the TimerProc callback is never hit. Any ideas? Carl /////////////////////////////////////////////////////////////////////////// [ module(SERVICE, uuid = "{99CCA443-725A-44F2-A5F3-9855AFACF970}", name = "QService", helpstring = "QService 1.0 Type Library", resource_name="IDS_SERVICENAME") ] class CQServiceModule { public: CQServiceModule() {}; public: HRESULT PreMessageLoop(int nShowCmd) { HRESULT hr = __super::PreMessageLoop(nShowCmd); if ( SUCCEEDED(hr) ) return S_OK; return hr; } HRESULT Start(int nCmd) { m_lTimer = (UINT)::SetTimer((HWND) NULL, 1, 10000, TimerProc); return __super::Start(nCmd); } static void CALLBACK TimerProc(HWND hwnd,UINT uMsg, UINT idEvent, DWORD dwTime) { _AtlModule.LogEvent(_T("TimerEvent")); } UINT m_lTimer; };