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);
}
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