Mega Code Archive
How to start and stop a service (or get status)
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Title: How to start and stop a service (or get status)
Question: How to use the API functions OpenSCManager, OpenService etc.
Answer:
Here are the functions ServiceStart and ServiceStop:
function ServiceStart(aMachine, aServiceName : string ) : boolean;
// aMachine is UNC path or local machine if left empty
var
h_manager,h_svc: SC_Handle;
svc_status: TServiceStatus;
Temp: PChar;
dwCheckPoint: DWord;
begin
svc_status.dwCurrentState := 1;
h_manager := OpenSCManager(PChar(aMachine), Nil,
SC_MANAGER_CONNECT);
if h_manager 0 then
begin
h_svc := OpenService(h_manager, PChar(aServiceName),
SERVICE_START or SERVICE_QUERY_STATUS);
if h_svc 0 then
begin
temp := nil;
if (StartService(h_svc,0,temp)) then
if (QueryServiceStatus(h_svc,svc_status)) then
begin
while (SERVICE_RUNNING svc_status.dwCurrentState) do
begin
dwCheckPoint := svc_status.dwCheckPoint;
Sleep(svc_status.dwWaitHint);
if (not QueryServiceStatus(h_svc,svc_status)) then
break;
if (svc_status.dwCheckPoint begin
// QueryServiceStatus didn't increment dwCheckPoint
break;
end;
end;
end;
CloseServiceHandle(h_svc);
end;
CloseServiceHandle(h_manager);
end;
Result := SERVICE_RUNNING = svc_status.dwCurrentState;
end;
function ServiceStop(aMachine,aServiceName : string ) : boolean;
// aMachine is UNC path or local machine if left empty
var
h_manager,h_svc : SC_Handle;
svc_status : TServiceStatus;
dwCheckPoint : DWord;
begin
h_manager:=OpenSCManager(PChar(aMachine),nil,
SC_MANAGER_CONNECT);
if h_manager 0 then
begin
h_svc := OpenService(h_manager,PChar(aServiceName),
SERVICE_STOP or SERVICE_QUERY_STATUS);
if h_svc 0 then
begin
if(ControlService(h_svc,SERVICE_CONTROL_STOP,
svc_status))then
begin
if(QueryServiceStatus(h_svc,svc_status))then
begin
while(SERVICE_STOPPED svc_status.dwCurrentState)do
begin
dwCheckPoint := svc_status.dwCheckPoint;
Sleep(svc_status.dwWaitHint);
if(not QueryServiceStatus(h_svc,svc_status))then
begin
// couldn't check status
break;
end;
if(svc_status.dwCheckPoint break;
end;
end;
end;
CloseServiceHandle(h_svc);
end;
CloseServiceHandle(h_manager);
end;
Result := SERVICE_STOPPED = svc_status.dwCurrentState;
end;
To get the status you need:
function ServiceGetStatus(sMachine, sService: string ): DWord;
var
h_manager,h_service: SC_Handle;
service_status : TServiceStatus;
hStat : DWord;
begin
hStat := 1;
h_manager := OpenSCManager(PChar(sMachine) ,Nil,
SC_MANAGER_CONNECT);
if h_manager 0 then
begin
h_svc := OpenService(h_manager,PChar(sService),
SERVICE_QUERY_STATUS);
if h_svc 0 then
begin
if(QueryServiceStatus(h_svc, service_status)) then
hStat := service_status.dwCurrentState;
CloseServiceHandle(h_svc);
end;
CloseServiceHandle(h_manager);
end;
Result := hStat;
end;
It's returning one of the following constant's:
SERVICE_STOPPED
SERVICE_RUNNING
SERVICE_PAUSED
SERVICE_START_PENDING
SERVICE_STOP_PENDING
SERVICE_CONTINUE_PENDING
or
SERVICE_PAUSE_PENDING
What you need is the unit WinSvc !
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