interacting with a Windows Service
in [Win32 API]
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From: matteo on 30 Mar 2006 08:40 Hi all, I turned my application in a common user-mode Windows service, which starts at boot time. It works fine, but it seems I can send only predefined messages to my service: install, uninstall, start, stop, pause, continue...That's good, but I need also to send "customized messages" to the service, to trigger some special actions in the service. Someone knows how to interact with a service by sending user-defined commands/signals? thank you all! matt
From: chris_doran on 30 Mar 2006 09:09 matteo wrote: > Hi all, > > I turned my application in a common user-mode Windows service, which > starts at boot time. > It works fine, but it seems I can send only predefined messages to my > service: install, uninstall, start, stop, pause, continue...That's > good, but I need also to send "customized messages" to the service, to > trigger some special actions in the service. > > Someone knows how to interact with a service by sending user-defined > commands/signals? > > > thank you all! > > matt You can send user-defined control codes in range 128-255 via ControlService(). The only way I know for anything bigger is to use sockets, shared memory, files, ... Chris
From: Scott McPhillips [MVP] on 30 Mar 2006 09:24 matteo wrote: > Hi all, > > I turned my application in a common user-mode Windows service, which > starts at boot time. > It works fine, but it seems I can send only predefined messages to my > service: install, uninstall, start, stop, pause, continue...That's > good, but I need also to send "customized messages" to the service, to > trigger some special actions in the service. > > Someone knows how to interact with a service by sending user-defined > commands/signals? CreateNamedPipe() or you can use winsock to open a TCP/IP connection. -- Scott McPhillips [VC++ MVP]
From: matteo on 30 Mar 2006 10:25 I try to do this, but when I send my user-defined command the service stops suddenly... #define SERVICE_CONTROL_CUSTOM 129 .... scm = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); service = OpenService(scm, ServiceName, SERVICE_ALL_ACCESS|SERVICE_USER_DEFINED_CONTROL); if (!service) ErrorHandler("OpenService", GetLastError()); .... cout << "Custom command..." << endl; SUCCESS = ControlService(service, SERVICE_CONTROL_CUSTOM, &status); and void ServiceCtrlHandler(DWORD controlCode) { DWORD currentState = 0; BOOL success; switch(controlCode) { . . . case SERVICE_CONTROL_CUSTOM: //fai azione personalizzata!!!! //fopen("c:\\custom1.txt","w"); currentState = SERVICE_RUNNING; break; ... } if I get the service status, after sending the command, it results STOPPED... any ideas?
From: Paul on 30 Mar 2006 10:48
<chris_doran(a)postmaster.co.uk> wrote in message news:1143727788.265166.265900(a)t31g2000cwb.googlegroups.com... > > matteo wrote: > > Hi all, > > > > I turned my application in a common user-mode Windows service, which > > starts at boot time. > > It works fine, but it seems I can send only predefined messages to my > > service: install, uninstall, start, stop, pause, continue...That's > > good, but I need also to send "customized messages" to the service, to > > trigger some special actions in the service. > > > > Someone knows how to interact with a service by sending user-defined > > commands/signals? > > > > > > thank you all! > > > > matt > > You can send user-defined control codes in range 128-255 via > ControlService(). The only way I know for anything bigger is to use > sockets, shared memory, files, ... > I wound up using pipes to talk to my services. IIRC I tried ControlService() and had problems with it, but I can't remember exactly why. The pipes method isn't hard to set up, works great, and is very flexible for whatever you need in future. Don't try to use a bidirectional pipe (ever, for anything) but that's the only caveat. |