Delphi 判断某个系统服务是否存在及相关状态

记得use WinSvc; 

//-------------------------------------
// 获取某个系统服务的当前状态
//
// return status code if successful
// -1 if not
//
// return codes:
// SERVICE_STOPPED
// SERVICE_RUNNING
// SERVICE_PAUSED
//
// following return codes are used to indicate that the service is in the
// middle of getting to one of the above states:
// SERVICE_START_PENDING
// SERVICE_STOP_PENDING
// SERVICE_CONTINUE_PENDING
// SERVICE_PAUSE_PENDING
//
// sMachine:
// machine name, ie: \SERVER
// empty = local machine
//
//sService
// service name, ie: Alerter
//
function TFormConfig.ServiceGetStatus(sMachine, sService: string ): DWord;
var
//service control
//manager handle
schm,
//service handle
schs: SC_Handle;
//service status
ss: TServiceStatus;
//current service status
dwStat : DWord;
begin
dwStat := ;
//connect to the service
//control manager
schm := OpenSCManager(PChar(sMachine), Nil, SC_MANAGER_CONNECT);
//if successful...
if(schm > )then
begin
//open a handle to
//the specified service
schs := OpenService(schm, PChar(sService), SERVICE_QUERY_STATUS);
//if successful...
if(schs > )then
begin
//retrieve the current status
//of the specified service
if(QueryServiceStatus(schs, ss))then
begin
dwStat := ss.dwCurrentState;
end;
//close service handle
CloseServiceHandle(schs);
end; 

// close service control
// manager handle
CloseServiceHandle(schm);
end; 

Result := dwStat;
end; 

{判断某服务是否安装，未安装返回true，已安装返回false}
function TFormConfig.ServiceUninstalled(sMachine, sService : string ) : boolean;
begin
Result :=  = ServiceGetStatus(sMachine, sService);
end; 

{判断某服务是否启动，启动返回true，未启动返回false}
function TFormConfig.ServiceRunning(sMachine, sService : string ) : boolean;
begin
Result := SERVICE_RUNNING = ServiceGetStatus(sMachine, sService );
end; 

{判断某服务是否停止，停止返回true，未停止返回false}
function TFormConfig.ServiceStopped(sMachine, sService : string ) : boolean;
begin
Result := SERVICE_STOPPED = ServiceGetStatus(sMachine, sService );
end;