When i double click on my server exe it runs as a console application and i can see the logs in console.
I have made a windows service using the code given at http://code.msdn.microsoft.com/windowsdesktop/CppWindowsService-cacf4948
Using this the server runs in background but i cant see the console. Can anyone tell me how can i send messages to the console from a service??
Thanks!
Got it! I print my logs from my service to a pipe handle and i just wrote a simple pipe client which reads the file and displays it in the console.
If anyone needs the code then ill post it here
Thanks!
Starting from Windows Vista the services are executed in a different session so most communications will not work.
http://msdn.microsoft.com/en-us/library/windows/hardware/gg463353.aspx
Microsoft have some ways to communicate with services as described here (only first paragraph).
http://msdn.microsoft.com/en-us/library/windows/desktop/ms683502%28v=vs.85%29.aspx
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So I wanted to create a windows service that runs a few commands in a batch file.
However, while I assume I can redirect stdout from the subprocess and read out an error message, I can't seem to find out how I would get that to display to the screen.
when starting a windows service, it gives errors when the service fails to start, so ideally I would like to just use the interface that pops up the other service errors rather than popping up some window of my own or writing a log file.
I used this to get started but it doesn't seem to have anything on error processing.
http://www.codeproject.com/Articles/499465/Simple-Windows-Service-in-Cplusplus
He just outputs to a debugger. I can definitely do that, but ideally the person starting the service would want to know if there was an error starting.
Yes, you can redirect the STDOUT of the spawned process. MSDN has an article on that topic:
Creating a Child Process with Redirected Input and Output
You can use ReportEvent(), EventWrite(), or TraceEvent() to write log messages to the System Event Log (which is located within Windows' Control Panel), depending on which logging API you decide to use. Refer to MSDN for more details:
Event Logging
Windows Event Log
A service is a background task, it should not display its own UIs. Use the system Event Viewer to view log messages. The popup the user sees if the service fails to start is not displayed by the service itself, but by the Service Control Manager.
Starting with Windows Vista, services do not run in the same desktop session as logged in users (Session 0 Isolation), so they cannot display their own UI anymore. If your service must display a popup message, it can use WTSSendMessage() for that. For more complex UIs, it is best to implement that as a separate non-service GUI app that runs in the user's session, and then the service can launch/communicate with that app as needed.
I have a Windows service written in CPP that I start manually. The service starts up just fine and works ok. However we have recently noticed in the Windows Services GUI that the service shows in the Starting state. Upon examining the Event Viewer it clearly shows that the service has entered the Running state.
Anyone got any nuggets of gold on this one?
Thanks.
The problem turned out to be an unaccounted for call to the SCM to start the service. Deleted the line and the problem went away.
I have created a c++ command line application. This application sends a revives messages from other computers and logs the results to a file. A simple application. One of the first things the app does is write to the log file the start up time.
Now that I have gotten the application to a good place, I want to install it as a service that runs on my computer (win 7).
I am using the NSIS, Simple_Service_Plugin to install the application and register the service in windows. I can see the service in windows service manager.
When I attempt to start the service, I get the following error message. The log file does not get created.
Windows could not start __THE_APP__ service on Local Computer.
Error 1053: The service did not respond to the start or control request in a timely fashion.
When I start the app from explore it starts without any problems and the log file is updated correctly.
When I search this error message on-line I find lots of help for C# and .Net applications and nothing for c++ apps.
My question is:
How do I start a C++ application (not dot.net) as a service?
A service isn't a regular appliction. It's a program that uses specific system classes and implements certain features that enable the OS to communicate with it.
See here (and the surrounding pages) for more details.
I have a service which constantly checks some application and assures that it wasn't closed. If this app closed - service launches it again.
The problem starts when user decides to log off the session. During logoff all applications are closing including the mine one. But the service is still running and constantly trying to start it again.
The questions is how to notify the service that user is going to log off and the application doesn't need to be restarted anymore? I've tried to make it using SERVICE_CONTROL_SESSIONCHANGE notification. But in accordance to MSDN they come to services when all apps already closed and logging off procedure completed. It is too late for me. Is there any way to programmatically find out that current session is in process of logging off?
My service launched under LocalSystem account.
Thanks.
p.s. I don't have the access to application source code. The goal need to be achieved without modifying it.
Have your service run two applications: the one it is a watchdog for, and a second one which you implement yourself. This second one can then respond to the log-off event by sending a message to the service (a la David Heffernan's answer), and the service will then know not to restart the watched job.
Open a communication channel between your app and your service and arrange for the app to tell the service that it is closing because of a logoff event.
You may not have access to the source code of the executable, but that doesn't mean that you can't affect the process. For instance, you could inject a DLL. Using SetWindowsHookEx, you'd catch the WM_ENDSESSION sent to the apps main window.
Why don't you create your service under the user that is running the App and tell it to startup automatic? In this case you should get the SERVICE_CONTROL_SHUTDOWN message when your user is logging off since the service would also be terminated.
I am looking for a working code example for Symbian S60 5th edition in which a console application can receive power off events (i.e. detect phone switch off). I know how to do this from UI application [AppUI, HandleSystemEventL(const TWsEvent& aEvent), etc], but Windows Server does not seem to send events if simple console application is listening to these events.
So, I have tried to connect to WS, call EventReady(&iStatus), but RunL is never called, and the application never receives EApaSystemEventShutdown.
Can anyone here provide working code for this?
Thank you.
You can use CSaveNotifier (savenotf.h, powermgrcli.lib) to receive powerdown notifications. Sorry, don't have a code snippet available at the moment.