stop the service in c++

Question

stop the service in c++

Ramamoorthy, Srinath (ext) 31

I have followed the link for my C++ services

https://www.codeproject.com/Articles/499465/Simple-Windows-Service-in-Cplusplus

if I stop the services in service window
then,

it passes the ServiceCtrlHandler successfully

VOID WINAPI ServiceCtrlHandler (DWORD CtrlCode)
{
switch (CtrlCode)
{
case SERVICE_CONTROL_STOP :

    if (g_ServiceStatus.dwCurrentState != SERVICE_RUNNING)  
       break;  
 
    /*   
     * Perform tasks necessary to stop the service here   
     */  
      
    g_ServiceStatus.dwControlsAccepted = 0;  
    g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;  
    g_ServiceStatus.dwWin32ExitCode = 0;  
    g_ServiceStatus.dwCheckPoint = 4;  
 
    if (SetServiceStatus (g_StatusHandle, &g_ServiceStatus) == FALSE)  
    {  
        OutputDebugString(_T(  
          "My Sample Service: ServiceCtrlHandler: SetServiceStatus returned error"));  
    }  
 
    // This will signal the worker thread to start shutting down  
    SetEvent (g_ServiceStopEvent);  
 
    break;  
 
 default:  
     break;  
}

}

and then
it hangs in stopping

MotoX80 36,291 Reputation points

2022-07-26T14:50:15.177+00:00

How does your code handle a SERVICE_CONTROL_STOP request?

Did you add any debugging/logging code so that you can see what your program is doing?
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-26T14:51:30.32+00:00

yes I did debug it passes the handler "handle a SERVICE_CONTROL_STOP request" successfully

Ramamoorthy, Srinath (ext) 31

it is not calling the main "VOID WINAPI ServiceMain (DWORD argc, LPSTR *argv)"

/*  
 * Perform any cleanup tasks  
 */  
OutputDebugString(_T("My Sample Service: ServiceMain: Performing Cleanup Operations"));  

CloseHandle (g_ServiceStopEvent);  

g_ServiceStatus.dwControlsAccepted = 0;  
g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;  
g_ServiceStatus.dwWin32ExitCode = 0;  
g_ServiceStatus.dwCheckPoint = 3;

Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-26T15:04:32.803+00:00

]1
for example it is showing like this
MotoX80 36,291 Reputation points

2022-07-26T15:10:37.073+00:00

I believe that DebugView will capture OutputDebugString data. Give that a try and see if you can figure out what functions are getting called.

https://learn.microsoft.com/en-us/sysinternals/downloads/debugview

Can I ask why you want to write a service in C++? It is not a trivial task and if you are new to programming, there might be better options. What are you trying to accomplish?
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-27T10:05:47.637+00:00

[63792] My Sample Service: Main: Entry
[63792] My Sample Service: ServiceMain: Entry
[63792] My Sample Service: ServiceMain: Performing Service Start Operations
[63792] My Sample Service: ServiceWorkerThread: Entry
[63792] My Sample Service: ServiceCtrlHandler: Entry
[63792] My Sample Service: ServiceCtrlHandler: Exit
[63792] My Sample Service: ServiceCtrlHandler: Entry
[63792] My Sample Service: ServiceCtrlHandler: Exit
[63792] My Sample Service: ServiceCtrlHandler: Entry
[63792] My Sample Service: ServiceCtrlHandler: SERVICE_CONTROL_STOP Request
[63792] My Sample Service: ServiceCtrlHandler: Exit

Thank you for the tool it is good for debugging
MotoX80 36,291 Reputation points

2022-07-27T17:42:48.42+00:00

In the ServiceWorkerThread, after the Sleep 3000, add a debug output to indicate "I woke up.".

In your output I don't see the "Waiting for Worker Thread to complete" message. I'm not sure what is happening. Maybe add more OutputDebugString messages so that you can trace what is being called. Add one right before the createthread call.
Junjie Zhu - MSFT 21,646 Reputation points

2022-07-28T08:49:52.373+00:00

Hi RamamoorthySrinathext,
Welcome to Microsoft Q&A!

My test results are the same as MotoX80, may I ask your computer environment and VS project property configuration?

2 answers

Your answer

MotoX80 36,291 Reputation points

2022-07-26T14:50:15.177+00:00

How does your code handle a SERVICE_CONTROL_STOP request?

Did you add any debugging/logging code so that you can see what your program is doing?
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-26T14:51:30.32+00:00

yes I did debug it passes the handler "handle a SERVICE_CONTROL_STOP request" successfully
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-26T14:57:16.593+00:00

it is not calling the main "VOID WINAPI ServiceMain (DWORD argc, LPSTR *argv)"

/* * Perform any cleanup tasks */ OutputDebugString(_T("My Sample Service: ServiceMain: Performing Cleanup Operations")); CloseHandle (g_ServiceStopEvent); g_ServiceStatus.dwControlsAccepted = 0; g_ServiceStatus.dwCurrentState = SERVICE_STOPPED; g_ServiceStatus.dwWin32ExitCode = 0; g_ServiceStatus.dwCheckPoint = 3;
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-26T15:04:32.803+00:00

]1
for example it is showing like this
MotoX80 36,291 Reputation points

2022-07-26T15:10:37.073+00:00

I believe that DebugView will capture OutputDebugString data. Give that a try and see if you can figure out what functions are getting called.

https://learn.microsoft.com/en-us/sysinternals/downloads/debugview

Can I ask why you want to write a service in C++? It is not a trivial task and if you are new to programming, there might be better options. What are you trying to accomplish?
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-27T10:05:47.637+00:00

[63792] My Sample Service: Main: Entry
[63792] My Sample Service: ServiceMain: Entry
[63792] My Sample Service: ServiceMain: Performing Service Start Operations
[63792] My Sample Service: ServiceWorkerThread: Entry
[63792] My Sample Service: ServiceCtrlHandler: Entry
[63792] My Sample Service: ServiceCtrlHandler: Exit
[63792] My Sample Service: ServiceCtrlHandler: Entry
[63792] My Sample Service: ServiceCtrlHandler: Exit
[63792] My Sample Service: ServiceCtrlHandler: Entry
[63792] My Sample Service: ServiceCtrlHandler: SERVICE_CONTROL_STOP Request
[63792] My Sample Service: ServiceCtrlHandler: Exit

Thank you for the tool it is good for debugging
MotoX80 36,291 Reputation points

2022-07-27T17:42:48.42+00:00

In the ServiceWorkerThread, after the Sleep 3000, add a debug output to indicate "I woke up.".

In your output I don't see the "Waiting for Worker Thread to complete" message. I'm not sure what is happening. Maybe add more OutputDebugString messages so that you can trace what is being called. Add one right before the createthread call.
Junjie Zhu - MSFT 21,646 Reputation points

2022-07-28T08:49:52.373+00:00

Hi RamamoorthySrinathext,
Welcome to Microsoft Q&A!

My test results are the same as MotoX80, may I ask your computer environment and VS project property configuration?

Answer 1

MotoX80 36,291

It is working fine for me. I am using Microsoft Visual Studio Community 2022.

Did you download and extract the zip file? Did VS perform an upgrade on the project?

Answer 2

Ramamoorthy, Srinath (ext) 31

yes you are right it is working when it is single thread but in case of multithreading?

In my function I am using multithreading

https://learn.microsoft.com/en-us/answers/questions/944374/hang-in-stopping.html

I am using vs 2019

multithreading: is stopping and hang image

singlethread is working as expected

MotoX80 36,291 Reputation points

2022-07-28T11:55:34.4+00:00

If you have modified the code and added something called "myfunction", then you will need to debug that. I have no idea what it does.

Note that in my output it says "Waiting for worker thread to complete.". One of your images has that, but the other does not. It would appear that whatever change you made to the code is not handling threads correctly.
Ramamoorthy, Srinath (ext) 31 Reputation points

2022-07-28T11:57:33.447+00:00

yes you are correct. just now I have checked my code does not end the thread correctly

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stop the service in c++

2 answers

Your answer