topic Re: Question about Object Reference in Application Development and Automation Discussions

Question about Object Reference

LucianoBentiveg — Fri, 21 Jul 2006 15:00:24 GMT

I have this situation:


CREATE OBJECT equipo EXPORTING sernr = p_sernr1
                               matnr = p_matnr1.

CALL METHOD equipo->ingreso_directo_homologado
                     EXPORTING centro  = aux_centro
                               almacen = ga_pos_entregas-almacen              IMPORTING error   = error
                               texto   = p_texto.

CREATE OBJECT equipo EXPORTING sernr = p_sernr2
                               matnr = p_matnr2.

CALL METHOD equipo->ingreso_directo_homologado
                     EXPORTING centro  = aux_centro
                               almacen = ga_pos_entregas-almacen              IMPORTING error   = error
                               texto   = p_texto.

Could be that second CREATE OBJECT sentence fails, and second CALL METHOD sentence refers to first object created?

Points guaranteed.

Re: Question about Object Reference

Former Member — Fri, 21 Jul 2006 15:06:04 GMT

Hi,

I dont think so.

equipo --> this is just a variable which holds the memmory location of the object created during first call.

when u will create another object using same variable ; i think new memmory location ( new object ) will be allocated to the variable.

I will try and confirm the same.

Re: Question about Object Reference

LucianoBentiveg — Fri, 21 Jul 2006 15:12:52 GMT

Ok, i agree with you, but what happens if second CREATE OBJECT fails? Holds equipo variable the memmory location of the first object created?

Re: Question about Object Reference

Former Member — Fri, 21 Jul 2006 15:21:31 GMT

Hi,

I have Test the same ; which i have written above . it working fine.

U can cross check. ( copy paste the code & run it )

Check the value o_alvgrid in debugging mode.

u will fine new refrence for each create object.


DATA  : o_alvgrid       TYPE REF TO cl_gui_alv_grid,
        o_custcontainer TYPE REF TO cl_gui_custom_container,
        o_custcntr_sum  TYPE REF TO cl_gui_custom_container.


CONSTANTS :
       lc_custcontrol  TYPE scrfname VALUE 'CC_ALV',
       lc_custcntr_sum TYPE scrfname VALUE 'CC_ALV_SUM'  .


    CREATE OBJECT o_custcontainer
      EXPORTING
        container_name              = lc_custcontrol
      EXCEPTIONS
        cntl_error                  = 1
        cntl_system_error           = 2
        create_error                = 3
        lifetime_error              = 4
        lifetime_dynpro_dynpro_link = 5
        OTHERS                      = 6.


      CREATE OBJECT o_alvgrid
        EXPORTING
          i_parent          = o_custcontainer
        EXCEPTIONS
          error_cntl_create = 1
          error_cntl_init   = 2
          error_cntl_link   = 3
          error_dp_create   = 4
          OTHERS            = 5.


    CREATE OBJECT o_custcntr_sum
      EXPORTING
        container_name              = lc_custcntr_sum
      EXCEPTIONS
        cntl_error                  = 1
        cntl_system_error           = 2
        create_error                = 3
        lifetime_error              = 4
        lifetime_dynpro_dynpro_link = 5
        OTHERS                      = 6.


      CREATE OBJECT o_alvgrid
        EXPORTING
          i_parent          = o_custcontainer
        EXCEPTIONS
          error_cntl_create = 1
          error_cntl_init   = 2
          error_cntl_link   = 3
          error_dp_create   = 4
          OTHERS            = 5.


write :/ 'ABC'.

As per 2nd post of urs .

i think result will be unpredictable.

initial value of refrence variable are always ...illegal refrence.

it may clear the variable to initial value

it may retain the current memmory location.

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Re: Question about Object Reference

Clemenss — Fri, 21 Jul 2006 15:30:37 GMT

Hi,

if your second CREATE OBJECT sentence fails, nothing will happen to the reference equipo. In consequence, as you assume, the second CALL METHOD still refers to first object created.

You should check the imported error to make sure the second CREATE was successful. Only then you may call method.

As you did not mention what is the class equipo is referenced to (looks like own object), it is hard to say what's happening.

I think in your case it will be OK to check the value of imported error parameter.

Regards,

Clemens

Re: Question about Object Reference

LucianoBentiveg — Fri, 21 Jul 2006 16:04:21 GMT

Can sombedy demonstrate with facts?

Re: Question about Object Reference

Laxmana_Appana_ — Fri, 21 Jul 2006 16:16:36 GMT

Hi,

If you are using same name to create many instances , system will automatically creates object references. object methods will work based on object references.

i don't think if second 'create object' fails , methods will not refer to the first object.

in debug mode check -> goto->display data object ->object

you can see the instance information

Regards

Appana