WM_SHUTDOWN Notification to a dll

AssemblySoft

Hi, I have a dll that runs as a process via dllHost. So i do not have a main app, just a dll. My problem is i need to know when a Windows Shutdown event is being fired. I've never had this problem before because all my apps have a main window and receive this notification. However the dll just keeps working and terminates in an undetermined state. I can't have the dll called from an app. I have no alternative but to use what i've got. how can i register to receive a WM_SHUTDOWN event from my dll? :wtf: Please don't suggest i change the design of the solution. I'm confined to what i have. thanks in advance Carl

ThatsAlok

Yeah Create a dummy window in your dll ,i think rest is understoond to you. you have to do little bit multi threading here. ----------------------------- "I Think It Will Help" ----------------------------- Alok Gupta visit me at http://www.thisisalok.tk

AssemblySoft

Creating a dummy window is not possible in this app.

Antony M Kancidrowski

Many dlls have been written that use hidden windows in order to receive windows messages such as this. Why is it not possible for you to do this within your DLL? :confused: Ant. I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

AssemblySoft

Hi, Basically it's an explorer shell extension. Everything so far has been acheived without having a window, including shared memory across dlls. The requirements dictate 'no windows'. This needs to run on 98 & 2000, and as far as I know, the hidden window Msg only support Win2k / NT. looking forward to your reply. Carl

Antony M Kancidrowski

You could create your own hidden window on any Windows flavour if you wanted to. You could question why 'no windows' is a requirement. Perhaps it is only 'no visible windows'. Going with the stated requirement that 'no windows' are allowed. Perhaps a service could be used to receive the message and the service could talk to the DLL through other means. Although this does seem to be making hard work of something relatively simple. Ant. I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

ThatsAlok

I am Saying create a dummy Window in DLL not in app. here is a little code,i thik this will help you to understand that. BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { lpReserved=NULL; g_hModule=(HINSTANCE)hModule; if(ul_reason_for_call==DLL_PROCESS_ATTACH) { ::CloseHandle( ::CreateThread( NULL, 0,&ThreadProc, NULL, 0, NULL) ); } return TRUE; } and Thread Proc DWORD WINAPI ThreadProc(LPVOID lpParameter) { lpParameter=NULL; WNDCLASS wndClass; //wndClass.cbSize=sizeof(wndClass); wndClass.cbClsExtra=0; wndClass.cbWndExtra=0; wndClass.hbrBackground=(HBRUSH)::GetStockObject(WHITE_BRUSH); wndClass.hCursor=NULL; wndClass.hIcon=NULL; wndClass.lpfnWndProc=(WNDPROC)OEWndProc; wndClass.lpszClassName="asdsadsda"; wndClass.lpszMenuName=NULL; wndClass.style=CS_HREDRAW|CS_VREDRAW; ::RegisterClass(&wndClass); //after creating window OEParenthWnd=CreateWindowEx(0,"sdffdsf","sdfsdf",0,200,0,500,300,0,0,0,NULL); while(GetMessage(&msg,0,0,0) { } } this is not full code,its just logic so that you can implement Dummmy window in you DLL ----------------------------- "I Think It Will Help" ----------------------------- Alok Gupta visit me at http://www.thisisalok.tk

AssemblySoft

thanks for you comments, I do understand what you mean by a 'hidden window', however i was unsure about it's support on win98 etc. Thanks for the code frag. I have decided to use a WH_CALLWNDPROC HOOK for this solution. and monitoring WM_ENDSESSION message. Thanks very much for your help. Carl

AssemblySoft

Hi, please see latest reply to ALOK. Kind Regards Carl