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ServiceBase.cpp
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ServiceBase.cpp
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/****************************** Module Header ******************************\
* Module Name: ServiceBase.cpp
* Project: CppWindowsService
* Copyright (c) Microsoft Corporation.
*
* Provides a base class for a service that will exist as part of a service
* application. CServiceBase must be derived from when creating a new service
* class.
*
* This source is subject to the Microsoft Public License.
* See http://www.microsoft.com/en-us/openness/resources/licenses.aspx#MPL.
* All other rights reserved.
*
* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
* EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
\***************************************************************************/
#pragma region Includes
#include "ServiceBase.h"
#include <assert.h>
#include <strsafe.h>
#pragma endregion
#pragma region Static Members
// Initialize the singleton service instance.
CServiceBase *CServiceBase::s_service = NULL;
//
// FUNCTION: CServiceBase::Run(CServiceBase &)
//
// PURPOSE: Register the executable for a service with the Service Control
// Manager (SCM). After you call Run(ServiceBase), the SCM issues a Start
// command, which results in a call to the OnStart method in the service.
// This method blocks until the service has stopped.
//
// PARAMETERS:
// * service - the reference to a CServiceBase object. It will become the
// singleton service instance of this service application.
//
// RETURN VALUE: If the function succeeds, the return value is TRUE. If the
// function fails, the return value is FALSE. To get extended error
// information, call GetLastError.
//
BOOL CServiceBase::Run(CServiceBase &service)
{
s_service = &service;
SERVICE_TABLE_ENTRY serviceTable[] =
{
{ service.m_name, ServiceMain },
{ NULL, NULL }
};
// Connects the main thread of a service process to the service control
// manager, which causes the thread to be the service control dispatcher
// thread for the calling process. This call returns when the service has
// stopped. The process should simply terminate when the call returns.
return StartServiceCtrlDispatcher(serviceTable);
}
//
// FUNCTION: CServiceBase::ServiceMain(DWORD, PWSTR *)
//
// PURPOSE: Entry point for the service. It registers the handler function
// for the service and starts the service.
//
// PARAMETERS:
// * dwArgc - number of command line arguments
// * lpszArgv - array of command line arguments
//
void WINAPI CServiceBase::ServiceMain(DWORD dwArgc, PWSTR *pszArgv)
{
assert(s_service != NULL);
// Register the handler function for the service
s_service->m_statusHandle = RegisterServiceCtrlHandler(
s_service->m_name, ServiceCtrlHandler);
if (s_service->m_statusHandle == NULL)
{
throw GetLastError();
}
// Start the service.
s_service->Start(dwArgc, pszArgv);
}
//
// FUNCTION: CServiceBase::ServiceCtrlHandler(DWORD)
//
// PURPOSE: The function is called by the SCM whenever a control code is
// sent to the service.
//
// PARAMETERS:
// * dwCtrlCode - the control code. This parameter can be one of the
// following values:
//
// SERVICE_CONTROL_CONTINUE
// SERVICE_CONTROL_INTERROGATE
// SERVICE_CONTROL_NETBINDADD
// SERVICE_CONTROL_NETBINDDISABLE
// SERVICE_CONTROL_NETBINDREMOVE
// SERVICE_CONTROL_PARAMCHANGE
// SERVICE_CONTROL_PAUSE
// SERVICE_CONTROL_SHUTDOWN
// SERVICE_CONTROL_STOP
//
// This parameter can also be a user-defined control code ranges from 128
// to 255.
//
void WINAPI CServiceBase::ServiceCtrlHandler(DWORD dwCtrl)
{
switch (dwCtrl)
{
case SERVICE_CONTROL_STOP: s_service->Stop(); break;
case SERVICE_CONTROL_PAUSE: s_service->Pause(); break;
case SERVICE_CONTROL_CONTINUE: s_service->Continue(); break;
case SERVICE_CONTROL_SHUTDOWN: s_service->Shutdown(); break;
case SERVICE_CONTROL_INTERROGATE: break;
default: break;
}
}
#pragma endregion
#pragma region Service Constructor and Destructor
//
// FUNCTION: CServiceBase::CServiceBase(PWSTR, BOOL, BOOL, BOOL)
//
// PURPOSE: The constructor of CServiceBase. It initializes a new instance
// of the CServiceBase class. The optional parameters (fCanStop,
/// fCanShutdown and fCanPauseContinue) allow you to specify whether the
// service can be stopped, paused and continued, or be notified when system
// shutdown occurs.
//
// PARAMETERS:
// * pszServiceName - the name of the service
// * fCanStop - the service can be stopped
// * fCanShutdown - the service is notified when system shutdown occurs
// * fCanPauseContinue - the service can be paused and continued
//
CServiceBase::CServiceBase(PWSTR pszServiceName,
BOOL fCanStop,
BOOL fCanShutdown,
BOOL fCanPauseContinue)
{
// Service name must be a valid string and cannot be NULL.
m_name = (pszServiceName == NULL) ? L"" : pszServiceName;
m_statusHandle = NULL;
// The service runs in its own process.
m_status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
// The service is starting.
m_status.dwCurrentState = SERVICE_START_PENDING;
// The accepted commands of the service.
DWORD dwControlsAccepted = 0;
if (fCanStop)
dwControlsAccepted |= SERVICE_ACCEPT_STOP;
if (fCanShutdown)
dwControlsAccepted |= SERVICE_ACCEPT_SHUTDOWN;
if (fCanPauseContinue)
dwControlsAccepted |= SERVICE_ACCEPT_PAUSE_CONTINUE;
m_status.dwControlsAccepted = dwControlsAccepted;
m_status.dwWin32ExitCode = NO_ERROR;
m_status.dwServiceSpecificExitCode = 0;
m_status.dwCheckPoint = 0;
m_status.dwWaitHint = 0;
}
//
// FUNCTION: CServiceBase::~CServiceBase()
//
// PURPOSE: The virtual destructor of CServiceBase.
//
CServiceBase::~CServiceBase(void)
{
}
#pragma endregion
#pragma region Service Start, Stop, Pause, Continue, and Shutdown
//
// FUNCTION: CServiceBase::Start(DWORD, PWSTR *)
//
// PURPOSE: The function starts the service. It calls the OnStart virtual
// function in which you can specify the actions to take when the service
// starts. If an error occurs during the startup, the error will be logged
// in the Application event log, and the service will be stopped.
//
// PARAMETERS:
// * dwArgc - number of command line arguments
// * lpszArgv - array of command line arguments
//
void CServiceBase::Start(DWORD dwArgc, PWSTR *pszArgv)
{
try
{
// Tell SCM that the service is starting.
SetServiceStatus(SERVICE_START_PENDING);
// Perform service-specific initialization.
OnStart(dwArgc, pszArgv);
// Tell SCM that the service is started.
SetServiceStatus(SERVICE_RUNNING);
}
catch (DWORD dwError)
{
// Log the error.
WriteErrorLogEntry(L"Service Start", dwError);
// Set the service status to be stopped.
SetServiceStatus(SERVICE_STOPPED, dwError);
}
catch (...)
{
// Log the error.
WriteEventLogEntry(L"Service failed to start.", EVENTLOG_ERROR_TYPE);
// Set the service status to be stopped.
SetServiceStatus(SERVICE_STOPPED);
}
}
//
// FUNCTION: CServiceBase::OnStart(DWORD, PWSTR *)
//
// PURPOSE: When implemented in a derived class, executes when a Start
// command is sent to the service by the SCM or when the operating system
// starts (for a service that starts automatically). Specifies actions to
// take when the service starts. Be sure to periodically call
// CServiceBase::SetServiceStatus() with SERVICE_START_PENDING if the
// procedure is going to take long time. You may also consider spawning a
// new thread in OnStart to perform time-consuming initialization tasks.
//
// PARAMETERS:
// * dwArgc - number of command line arguments
// * lpszArgv - array of command line arguments
//
void CServiceBase::OnStart(DWORD dwArgc, PWSTR *pszArgv)
{
}
//
// FUNCTION: CServiceBase::Stop()
//
// PURPOSE: The function stops the service. It calls the OnStop virtual
// function in which you can specify the actions to take when the service
// stops. If an error occurs, the error will be logged in the Application
// event log, and the service will be restored to the original state.
//
void CServiceBase::Stop()
{
DWORD dwOriginalState = m_status.dwCurrentState;
try
{
// Tell SCM that the service is stopping.
SetServiceStatus(SERVICE_STOP_PENDING);
// Perform service-specific stop operations.
OnStop();
// Tell SCM that the service is stopped.
SetServiceStatus(SERVICE_STOPPED);
}
catch (DWORD dwError)
{
// Log the error.
WriteErrorLogEntry(L"Service Stop", dwError);
// Set the orginal service status.
SetServiceStatus(dwOriginalState);
}
catch (...)
{
// Log the error.
WriteEventLogEntry(L"Service failed to stop.", EVENTLOG_ERROR_TYPE);
// Set the orginal service status.
SetServiceStatus(dwOriginalState);
}
}
//
// FUNCTION: CServiceBase::OnStop()
//
// PURPOSE: When implemented in a derived class, executes when a Stop
// command is sent to the service by the SCM. Specifies actions to take
// when a service stops running. Be sure to periodically call
// CServiceBase::SetServiceStatus() with SERVICE_STOP_PENDING if the
// procedure is going to take long time.
//
void CServiceBase::OnStop()
{
}
//
// FUNCTION: CServiceBase::Pause()
//
// PURPOSE: The function pauses the service if the service supports pause
// and continue. It calls the OnPause virtual function in which you can
// specify the actions to take when the service pauses. If an error occurs,
// the error will be logged in the Application event log, and the service
// will become running.
//
void CServiceBase::Pause()
{
try
{
// Tell SCM that the service is pausing.
SetServiceStatus(SERVICE_PAUSE_PENDING);
// Perform service-specific pause operations.
OnPause();
// Tell SCM that the service is paused.
SetServiceStatus(SERVICE_PAUSED);
}
catch (DWORD dwError)
{
// Log the error.
WriteErrorLogEntry(L"Service Pause", dwError);
// Tell SCM that the service is still running.
SetServiceStatus(SERVICE_RUNNING);
}
catch (...)
{
// Log the error.
WriteEventLogEntry(L"Service failed to pause.", EVENTLOG_ERROR_TYPE);
// Tell SCM that the service is still running.
SetServiceStatus(SERVICE_RUNNING);
}
}
//
// FUNCTION: CServiceBase::OnPause()
//
// PURPOSE: When implemented in a derived class, executes when a Pause
// command is sent to the service by the SCM. Specifies actions to take
// when a service pauses.
//
void CServiceBase::OnPause()
{
}
//
// FUNCTION: CServiceBase::Continue()
//
// PURPOSE: The function resumes normal functioning after being paused if
// the service supports pause and continue. It calls the OnContinue virtual
// function in which you can specify the actions to take when the service
// continues. If an error occurs, the error will be logged in the
// Application event log, and the service will still be paused.
//
void CServiceBase::Continue()
{
try
{
// Tell SCM that the service is resuming.
SetServiceStatus(SERVICE_CONTINUE_PENDING);
// Perform service-specific continue operations.
OnContinue();
// Tell SCM that the service is running.
SetServiceStatus(SERVICE_RUNNING);
}
catch (DWORD dwError)
{
// Log the error.
WriteErrorLogEntry(L"Service Continue", dwError);
// Tell SCM that the service is still paused.
SetServiceStatus(SERVICE_PAUSED);
}
catch (...)
{
// Log the error.
WriteEventLogEntry(L"Service failed to resume.", EVENTLOG_ERROR_TYPE);
// Tell SCM that the service is still paused.
SetServiceStatus(SERVICE_PAUSED);
}
}
//
// FUNCTION: CServiceBase::OnContinue()
//
// PURPOSE: When implemented in a derived class, OnContinue runs when a
// Continue command is sent to the service by the SCM. Specifies actions to
// take when a service resumes normal functioning after being paused.
//
void CServiceBase::OnContinue()
{
}
//
// FUNCTION: CServiceBase::Shutdown()
//
// PURPOSE: The function executes when the system is shutting down. It
// calls the OnShutdown virtual function in which you can specify what
// should occur immediately prior to the system shutting down. If an error
// occurs, the error will be logged in the Application event log.
//
void CServiceBase::Shutdown()
{
try
{
// Perform service-specific shutdown operations.
OnShutdown();
// Tell SCM that the service is stopped.
SetServiceStatus(SERVICE_STOPPED);
}
catch (DWORD dwError)
{
// Log the error.
WriteErrorLogEntry(L"Service Shutdown", dwError);
}
catch (...)
{
// Log the error.
WriteEventLogEntry(L"Service failed to shut down.", EVENTLOG_ERROR_TYPE);
}
}
//
// FUNCTION: CServiceBase::OnShutdown()
//
// PURPOSE: When implemented in a derived class, executes when the system
// is shutting down. Specifies what should occur immediately prior to the
// system shutting down.
//
void CServiceBase::OnShutdown()
{
}
#pragma endregion
#pragma region Helper Functions
//
// FUNCTION: CServiceBase::SetServiceStatus(DWORD, DWORD, DWORD)
//
// PURPOSE: The function sets the service status and reports the status to
// the SCM.
//
// PARAMETERS:
// * dwCurrentState - the state of the service
// * dwWin32ExitCode - error code to report
// * dwWaitHint - estimated time for pending operation, in milliseconds
//
void CServiceBase::SetServiceStatus(DWORD dwCurrentState,
DWORD dwWin32ExitCode,
DWORD dwWaitHint)
{
static DWORD dwCheckPoint = 1;
// Fill in the SERVICE_STATUS structure of the service.
m_status.dwCurrentState = dwCurrentState;
m_status.dwWin32ExitCode = dwWin32ExitCode;
m_status.dwWaitHint = dwWaitHint;
m_status.dwCheckPoint =
((dwCurrentState == SERVICE_RUNNING) ||
(dwCurrentState == SERVICE_STOPPED)) ?
0 : dwCheckPoint++;
// Report the status of the service to the SCM.
::SetServiceStatus(m_statusHandle, &m_status);
}
//
// FUNCTION: CServiceBase::WriteEventLogEntry(PWSTR, WORD)
//
// PURPOSE: Log a message to the Application event log.
//
// PARAMETERS:
// * pszMessage - string message to be logged.
// * wType - the type of event to be logged. The parameter can be one of
// the following values.
//
// EVENTLOG_SUCCESS
// EVENTLOG_AUDIT_FAILURE
// EVENTLOG_AUDIT_SUCCESS
// EVENTLOG_ERROR_TYPE
// EVENTLOG_INFORMATION_TYPE
// EVENTLOG_WARNING_TYPE
//
void CServiceBase::WriteEventLogEntry(PWSTR pszMessage, WORD wType)
{
HANDLE hEventSource = NULL;
LPCWSTR lpszStrings[2] = { NULL, NULL };
hEventSource = RegisterEventSource(NULL, m_name);
if (hEventSource)
{
lpszStrings[0] = m_name;
lpszStrings[1] = pszMessage;
ReportEvent(hEventSource, // Event log handle
wType, // Event type
0, // Event category
0, // Event identifier
NULL, // No security identifier
2, // Size of lpszStrings array
0, // No binary data
lpszStrings, // Array of strings
NULL // No binary data
);
DeregisterEventSource(hEventSource);
}
}
//
// FUNCTION: CServiceBase::WriteErrorLogEntry(PWSTR, DWORD)
//
// PURPOSE: Log an error message to the Application event log.
//
// PARAMETERS:
// * pszFunction - the function that gives the error
// * dwError - the error code
//
void CServiceBase::WriteErrorLogEntry(PWSTR pszFunction, DWORD dwError)
{
wchar_t szMessage[260];
StringCchPrintf(szMessage, ARRAYSIZE(szMessage),
L"%s failed w/err 0x%08lx", pszFunction, dwError);
WriteEventLogEntry(szMessage, EVENTLOG_ERROR_TYPE);
}
#pragma endregion