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Service Status Checking....

Posted on 2001-06-08
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Medium Priority
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Last Modified: 2006-11-17

Hi,

I'm trying to check the current status of a service.

I've used this sample code from a previous question  logged on this site but when I change the service name from 'Alerter' to for example 'ClipBook' the returning value is given as an error (The Handle Is Invalid)
Any ideas as to why..

procedure TForm1.Button2Click(Sender: TObject);
var SC : integer;
  SHwnd : integer;
  ST : _Service_Status;
begin
 SC:=OpenSCManager(nil,'ServicesActive',GENERIC_READ);
 SHwnd:=OpenService(SC,'ClipBook',SERVICE_QUERY_STATUS);
  if not QueryServiceStatus(SHwnd,ST)
    then Listbox1.Items.Add('Error: ' + SysErrorMessage(GetLastError))
    else begin
   with listbox1.items do
case st.dwCurrentState of
SERVICE_START_PENDING    : Add('service start pending');
SERVICE_STOPPED          : Add('service stopped');
SERVICE_STOP_PENDING     : Add('service stop pending');
SERVICE_RUNNING          : Add('service started');
SERVICE_CONTINUE_PENDING : Add('service continue pending');
SERVICE_PAUSE_PENDING    : Add('service pause pending');
SERVICE_PAUSED           : Add('service paused');
end;
end;

end;



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Question by:Madmarlin
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2 Comments
 
LVL 8

Accepted Solution

by:
TOndrej earned 200 total points
ID: 6167431
Most probably you are using an incorrect name of the service. Note that Name of a service can be different from DisplayName (shown in Control Panel).

sc query shows:

SERVICE_NAME: ClipSrv
DISPLAY_NAME: ClipBook Server
        TYPE               : 10  WIN32_OWN_PROCESS
        STATE              : 4  RUNNING
                                (STOPPABLE,NOT_PAUSABLE,IGNORES_SHUTDOWN)
        WIN32_EXIT_CODE    : 0  (0x0)
        SERVICE_EXIT_CODE  : 0  (0x0)
        CHECKPOINT         : 0x0
        WAIT_HINT          : 0x0
0
 
LVL 1

Author Comment

by:Madmarlin
ID: 6167504
i cant beleive that I was using the incorrect Name..

Thanks..
Madmarlin
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