How can I call another application from my Delphi service?

I made a service with Delphi. Every time I call another application in this service, the application does not work. What's wrong?

By the way, I used shellexecute, shellopen or called it with cmd. None of these methods work.

This is my code:

    program roro_serv;

uses
  SvcMgr,
  Unit1 in 'Unit1.pas' {Service1: TService},
  ping in 'ping.pas';

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TService1, Service1);
  Application.Run;
end.

    unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, SvcMgr, Dialogs,
  ExtCtrls, DB, MemDS, DBAccess, MyAccess, Menus, forms, IniFiles,
  ComCtrls, wininet, Variants, shellapi,
  FileCtrl, ExtActns, StdCtrls, ShellCtrls;

type
  TService1 = class(TService)
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
    procedure ServiceExecute(Sender: TService);
    procedure ServiceStop(Sender: TService; var Stopped: Boolean);
    procedure ServiceStart(Sender: TService; var Started: Boolean);
  private
    { Private declarations }
  public
    function GetServiceController: TServiceController; override;
    { Public declarations }
    procedure run_procedure;
    procedure log(text_file, atext : string );
    procedure loginfo(text : string);
    function  CheckUrl(url: string): boolean;
    procedure execCMD(CommandLine, Work:  string);
    function  DoDownload(FromUrl, ToFile: String): boolean;
  end;

var
  Service1: TService1;
  iTime : integer;
  limit_time : integer = 2;
  myini : TiniFile;
  default_exe_path : string = '';
  default_log_path : string = '';
  appdir : String = '';

implementation

{$R *.DFM}

uses ping;

function TService1.CheckUrl(url: string): boolean;
var 
hSession, hfile, hRequest: hInternet;
dwindex,dwcodelen :dword; 
dwcode:array[1..20] of char; 
res : pchar; 
begin 
if pos('http://',lowercase(url))=0 then 
url := 'http://'+url; 
Result := false; 
hSession := InternetOpen('InetURL:/1.0', 
INTERNET_OPEN_TYPE_PRECONFIG,nil, nil, 0);
if assigned(hsession) then
begin 
hfile := InternetOpenUrl(
hsession, 
pchar(url), 
nil, 
0, 
INTERNET_FLAG_RELOAD, 
0); 
dwIndex := 0; 
dwCodeLen := 10; 
HttpQueryInfo(hfile, HTTP_QUERY_STATUS_CODE, 
@dwcode, dwcodeLen, dwIndex); 
res := pchar(@dwcode); 
result:= (res ='200') or (res ='302'); 
if assigned(hfile) then 
InternetCloseHandle(hfile); 
InternetCloseHandle(hsession); 
end;
end;

procedure ServiceController(CtrlCode: DWord); stdcall;
begin
  Service1.Controller(CtrlCode);
end;

function TService1.GetServiceController: TServiceController;
begin
  Result := ServiceController;
end;

procedure TService1.Timer1Timer(Sender: TObject);
begin
iTime:=iTime+1;
if iTime=15 then // (limit_time*60) then
  begin
      itime:=1;
      run_procedure;
  end;
// loginfo('Defaultlog : '+default_log_path+'; exe : '+default_exe_path);
end;

procedure TService1.ServiceExecute(Sender: TService);
begin
Timer1.Enabled := True;
while not Terminated do
ServiceThread.ProcessRequests(True);
Timer1.Enabled := False;
end;

procedure TService1.run_procedure;
var
i : integer;
sUrl, sLogFile, sAction, sAct_param : String;
begin
for i:=0 to 20 do
   begin
   sLogFile:=default_log_path+myini.ReadString('logs', 'log_file'+intTostr(i), '');
   if fileexists(slogfile) then
      begin
      loginfo(slogfile+' tersedia');
      sAction:=myini.ReadString('logs', 'action'+intTostr(i), '');
           if ((trim(sAction)<>'') and (fileexists(default_exe_path+sAction))) then
              begin
                   // this line is don't work in servcie
                   ShellExecute(Application.Handle, 'open', 'c:\Windows\notepad.exe', nil, nil, SW_SHOWNORMAL);
                   sAct_param:=myini.ReadString('logs', 'action_prm'+intTostr(i), '');
                   // this line is don't work in servcie
                   execCMD(sAction+' '+sAct_param, default_exe_path);
                   loginfo(sAction+' '+sAct_param+' defpath : '+default_exe_path);
                   // this loginfo works
              end;
      end else
      begin

      end;

   end;
end;

procedure TService1.log(text_file, atext: string);
var
logFile : TextFile;
begin
AssignFile(LogFile, text_file);
if FileExists(text_file) then
Append(LogFile) else rewrite(LogFile);
WriteLn(logFile, aText);
CloseFile(LogFile);
end;

procedure TService1.loginfo(text: string);
begin
log(ChangeFileExt(application.exename, '.log'), formatdateTime('dd-mm-yyyy hh:nn:ss ', now)+
text);
end;

procedure TService1.ServiceStop(Sender: TService; var Stopped: Boolean);
begin
myini.Free;
end;

procedure TService1.execCMD(CommandLine, Work: string);
var
SA: TSecurityAttributes;
SI: TStartupInfo;
PI: TProcessInformation;
StdOutPipeRead, StdOutPipeWrite: THandle;
WorkDir: string;
begin
with SA do begin
nLength := SizeOf(SA);
bInheritHandle := True;
lpSecurityDescriptor := nil;
end;
CreatePipe(StdOutPipeRead, StdOutPipeWrite, @SA, 0);
try
with SI do
begin
FillChar(SI, SizeOf(SI), 0);
cb := SizeOf(SI);
dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
wShowWindow := SW_HIDE;
hStdInput := GetStdHandle(STD_INPUT_HANDLE); // don't redirect stdin
hStdOutput := StdOutPipeWrite;
hStdError := StdOutPipeWrite;
end;
WorkDir := Work;
CreateProcess(nil, PChar('cmd.exe /C ' + CommandLine),
nil, nil, True, 0, nil,
PChar(WorkDir), SI, PI);
CloseHandle(StdOutPipeWrite);
finally
CloseHandle(StdOutPipeRead);
end;
end;

procedure TService1.ServiceStart(Sender: TService; var Started: Boolean);
begin
appdir:=ExtractFileDir(Application.ExeName);
myini:=TiniFile.Create(ExtractFileDir(application.ExeName)+'\setting.ini');
limit_time:=myini.ReadInteger('setting', 'limit_time', 0);
default_exe_path:=myini.ReadString('setting', 'default_exe_path','');
if trim(default_exe_path)='' then default_exe_path:=appdir+'\';

default_log_path:=myini.ReadString('setting', 'default_log_path','');
if trim(default_log_path)='' then default_log_path:=appdir+'\logs\';

end;

function TService1.DoDownload(FromUrl, ToFile: String): boolean;
begin
 {  with TDownloadURL.Create(self) do
   try
     URL:=FromUrl;
     FileName := ToFile;
     ExecuteTarget(nil) ;
   finally
     Free;
   end;    }
end;

end.

See the run_procedure line of code;

Simply put: how can I call another application from my service?