BDC issue background and foreground

Question

Hiii
i have already write bdc code using batch input. The data is taken from an excel file . 
How the program work now is it create a session in SM35 and i can decide to execute the session either in background or foreground. 
The reson why i did batch input and not call transaction is because i am told that with call transaction you can't execute batch input program in background since the excel file will be loaded from the user desktop.  With call transaction and background execution the file need to be loaded on server first and then take the file from the server to BDC tcode.
My problem is I need my program to execute automatically without passing though the SM35.  I also need to give the option to user to either execute is in foreground or background.
BDC code look this:
Call function "OPEN_BDC"
group = "ztest"  “I use constant
keep = "X'
perform dynpro
perform fillfield
call fuction "CLOSE_BDC"
1)     I am told to use the FM file_open / file_submit / file_close but I don’t really know hat parameter to pass in those FM the file_submit is giving me exception error.
2)     I tried to use submit program RSBDCSUB .  it create a session in sm35 and have status background job but the session haven’t executed
3)     All the No1 and No2 is to execute the BDC in background then what about the solution if user what to execute in foreground.
Please i need precise answer??

Answer 1

Job_submit is not functioning plzzz ess sample code below because of      invalid_jobdata                   = 3
  CALL FUNCTION 'JOB_OPEN'
    EXPORTING
      jobgroup               = ‘Ztest’ //Session name in SM35
      jobname                = v_jobname
   IMPORTING
     jobcount               = v_jobcount
   EXCEPTIONS
     cant_create_job        = 1
     invalid_job_data       = 2
     jobname_missing        = 3
     OTHERS                 = 4
  IF sy-subrc <> 0.
  ENDIF.
  CALL FUNCTION 'JOB_SUBMIT'
    EXPORTING
      authcknam                         = sy-uname
      jobcount                          = v_jobcount
      jobname                           = v_jobname
     language                           = sy-langu
     report                            = sy-repid
  VARIANT                           = ' '
IMPORTING
  STEP_NUMBER                       =
   EXCEPTIONS
     bad_priparams                     = 1
     bad_xpgflags                      = 2
     invalid_jobdata                   = 3
     jobname_missing                   = 4
     job_notex                         = 5
     job_submit_failed                 = 6
     lock_failed                       = 7
     program_missing                   = 8
     prog_abap_and_extpg_set           = 9
     OTHERS                            = 10
  IF sy-subrc <> 0.
  ENDIF.
  CALL FUNCTION 'JOB_CLOSE'
    EXPORTING
      jobcount                          = v_jobcount
      jobname                           = v_jobname
   sdlstrtdt                         = sy-uzeit
   sdlstrttm                         = sy-datum
   EXCEPTIONS
     cant_start_immediate              = 1
     invalid_startdate                 = 2
     jobname_missing                   = 3
     job_close_failed                  = 4
     job_nosteps                       = 5
     job_notex                         = 6
     lock_failed                       = 7
     invalid_target                    = 8
     OTHERS                            = 9
  IF sy-subrc <> 0. 
ENDIF.