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Cambio de la configuración de un servicio

Un programa de configuración de servicio usa las funciones ChangeServiceConfig y ChangeServiceConfig2 para cambiar los parámetros de configuración de un servicio instalado. El programa abre un identificador para el objeto de servicio, modifica su configuración y, a continuación, cierra el identificador del objeto de servicio.

En el ejemplo siguiente, la función DoDisableSvc usa ChangeServiceConfig para cambiar el tipo de inicio del servicio a "Disabled", la función DoEnableSvc usa ChangeServiceConfig para cambiar el tipo de inicio del servicio a "Enabled" y la función DoUpdateSvcDesc usa ChangeServiceConfig2 para establecer la descripción del servicio en "Esta es una descripción de prueba". La variable szSvcName es una variable global que contiene el nombre del servicio. Para obtener el ejemplo completo que establece esta variable, vea SvcConfig.cpp.

//
// Purpose: 
//   Disables the service.
//
// Parameters:
//   None
// 
// Return value:
//   None
//
VOID __stdcall DoDisableSvc()
{
    SC_HANDLE schSCManager;
    SC_HANDLE schService;

    // Get a handle to the SCM database. 
 
    schSCManager = OpenSCManager( 
        NULL,                    // local computer
        NULL,                    // ServicesActive database 
        SC_MANAGER_ALL_ACCESS);  // full access rights 
 
    if (NULL == schSCManager) 
    {
        printf("OpenSCManager failed (%d)\n", GetLastError());
        return;
    }

    // Get a handle to the service.

    schService = OpenService( 
        schSCManager,            // SCM database 
        szSvcName,               // name of service 
        SERVICE_CHANGE_CONFIG);  // need change config access 
 
    if (schService == NULL)
    { 
        printf("OpenService failed (%d)\n", GetLastError()); 
        CloseServiceHandle(schSCManager);
        return;
    }    

    // Change the service start type.

    if (! ChangeServiceConfig( 
        schService,        // handle of service 
        SERVICE_NO_CHANGE, // service type: no change 
        SERVICE_DISABLED,  // service start type 
        SERVICE_NO_CHANGE, // error control: no change 
        NULL,              // binary path: no change 
        NULL,              // load order group: no change 
        NULL,              // tag ID: no change 
        NULL,              // dependencies: no change 
        NULL,              // account name: no change 
        NULL,              // password: no change 
        NULL) )            // display name: no change
    {
        printf("ChangeServiceConfig failed (%d)\n", GetLastError()); 
    }
    else printf("Service disabled successfully.\n"); 

    CloseServiceHandle(schService); 
    CloseServiceHandle(schSCManager);
}

//
// Purpose: 
//   Enables the service.
//
// Parameters:
//   None
// 
// Return value:
//   None
//
VOID __stdcall DoEnableSvc()
{
    SC_HANDLE schSCManager;
    SC_HANDLE schService;

    // Get a handle to the SCM database. 
 
    schSCManager = OpenSCManager( 
        NULL,                    // local computer
        NULL,                    // ServicesActive database 
        SC_MANAGER_ALL_ACCESS);  // full access rights 
 
    if (NULL == schSCManager) 
    {
        printf("OpenSCManager failed (%d)\n", GetLastError());
        return;
    }

    // Get a handle to the service.

    schService = OpenService( 
        schSCManager,            // SCM database 
        szSvcName,               // name of service 
        SERVICE_CHANGE_CONFIG);  // need change config access 
 
    if (schService == NULL)
    { 
        printf("OpenService failed (%d)\n", GetLastError()); 
        CloseServiceHandle(schSCManager);
        return;
    }    

    // Change the service start type.

    if (! ChangeServiceConfig( 
        schService,            // handle of service 
        SERVICE_NO_CHANGE,     // service type: no change 
        SERVICE_DEMAND_START,  // service start type 
        SERVICE_NO_CHANGE,     // error control: no change 
        NULL,                  // binary path: no change 
        NULL,                  // load order group: no change 
        NULL,                  // tag ID: no change 
        NULL,                  // dependencies: no change 
        NULL,                  // account name: no change 
        NULL,                  // password: no change 
        NULL) )                // display name: no change
    {
        printf("ChangeServiceConfig failed (%d)\n", GetLastError()); 
    }
    else printf("Service enabled successfully.\n"); 

    CloseServiceHandle(schService); 
    CloseServiceHandle(schSCManager);
}

//
// Purpose: 
//   Updates the service description to "This is a test description".
//
// Parameters:
//   None
// 
// Return value:
//   None
//
VOID __stdcall DoUpdateSvcDesc()
{
    SC_HANDLE schSCManager;
    SC_HANDLE schService;
    SERVICE_DESCRIPTION sd;
    LPTSTR szDesc = TEXT("This is a test description");

    // Get a handle to the SCM database. 
 
    schSCManager = OpenSCManager( 
        NULL,                    // local computer
        NULL,                    // ServicesActive database 
        SC_MANAGER_ALL_ACCESS);  // full access rights 
 
    if (NULL == schSCManager) 
    {
        printf("OpenSCManager failed (%d)\n", GetLastError());
        return;
    }

    // Get a handle to the service.

    schService = OpenService( 
        schSCManager,            // SCM database 
        szSvcName,               // name of service 
        SERVICE_CHANGE_CONFIG);  // need change config access 
 
    if (schService == NULL)
    { 
        printf("OpenService failed (%d)\n", GetLastError()); 
        CloseServiceHandle(schSCManager);
        return;
    }    

    // Change the service description.

    sd.lpDescription = szDesc;

    if( !ChangeServiceConfig2(
        schService,                 // handle to service
        SERVICE_CONFIG_DESCRIPTION, // change: description
        &sd) )                      // new description
    {
        printf("ChangeServiceConfig2 failed\n");
    }
    else printf("Service description updated successfully.\n");

    CloseServiceHandle(schService); 
    CloseServiceHandle(schSCManager);
}

Configuración de servicio

Ejemplo de servicio completo