Check, if a process is running

{ Check if a process from the task list is active. } 

uses TlHelp32; 


function processExists(exeFileName: string): Boolean; 
var 
  ContinueLoop: BOOL; 
  FSnapshotHandle: THandle; 
  FProcessEntry32: TProcessEntry32; 
begin 
  FSnapshotHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0); 
  FProcessEntry32.dwSize := SizeOf(FProcessEntry32); 
  ContinueLoop := Process32First(FSnapshotHandle, FProcessEntry32); 
  Result := False; 
   while Integer(ContinueLoop) <> 0 do 
   begin 
     if ((UpperCase(ExtractFileName(FProcessEntry32.szExeFile)) = 
      UpperCase(ExeFileName))  or (UpperCase(FProcessEntry32.szExeFile) = 
      UpperCase(ExeFileName)))  then 
     begin 
      Result := True; 
     end; 
    ContinueLoop := Process32Next(FSnapshotHandle, FProcessEntry32); 
   end; 
  CloseHandle(FSnapshotHandle); 
end; 

procedure TForm1.Button1Click(Sender: TObject); 
begin 
   if processExists('notepad.exe')  then 
    ShowMessage('process  is running') 
  else 
    ShowMessage('process not running'); 
end;