topic Re: ABAP Objects - Instance of a method in Application Development and Automation Discussions

ABAP Objects - Instance of a method

Former Member — Thu, 02 Jun 2005 06:12:16 GMT

Goodmorning to you all,

Can anyone explain the process in :

IF cl_gui_alv_grid=>offline( ) IS INITIAL.

The method OFFLINE has a returning parameter E_OFFLINE.

Questions :

- how does the system recognise this parameter.

- can i check this variable in the debugger.

- general explanation of the working of this.

TIA,

Rob Makelaar

The Netherlands

Re: ABAP Objects - Instance of a method

sergey_korolev — Thu, 02 Jun 2005 06:27:21 GMT

If the method has the only RETURNING parameter and only IMPORTING parameters (or none), than the method could be called in a functional manner, that is it can be used in expressions like in your code snippet. If a method has more than one RETURNING parameter (or has no RETURINING parameter), or has not only IMPORTING but also EXPORTING or CHANGING parameters than trying to use it in expressions would cause a syntax error.

Re: ABAP Objects - Instance of a method

Former Member — Thu, 02 Jun 2005 06:28:19 GMT

Hi Rob,

At runtime the function call cl_gui_alv_grid=>offline( )

is replaced by the valueOf E_OFFLINE(int4), surely you

can check it in debugger.

Regards,

Narinder Hartala

Message was edited by: Narinder Hartala

Re: ABAP Objects - Instance of a method

Former Member — Thu, 02 Jun 2005 06:29:55 GMT

Hi,

For creating a container we will use this method.

In PBO,

FORM f9000_objects_create.

IF cl_gui_alv_grid=>offline( ) IS INITIAL.

CREATE OBJECT o_dockingcontainer

EXPORTING

ratio = '95'

EXCEPTIONS

cntl_error = 1

cntl_system_error = 2

create_error = 3

lifetime_error = 4

lifetime_dynpro_dynpro_link = 5

others = 6.

IF sy-subrc NE 0.

MESSAGE i001 WITH text-e01."Error in creating Docking container

LEAVE LIST-PROCESSING.

ENDIF.

CREATE OBJECT o_alvgrid

EXPORTING

i_parent = o_dockingcontainer.

ENDFORM. " f9000_objects_create

Thanks & Regards,

Judith.

Re: ABAP Objects - Instance of a method

Former Member — Thu, 02 Jun 2005 07:19:58 GMT

Hi Narinder,

Sure, you can see the variable IN the method 'Offline'. But when he's returning in the calling section, the variable 'e_offline' is not known anymore.

So, how does the condition work in the calling section.

Kind regards,

Rob Makelaar

Re: ABAP Objects - Instance of a method

Former Member — Thu, 02 Jun 2005 07:29:28 GMT

Hi Rob,

Only integar value(INT4) is returned and we are checking

wether it is initial or not.

you can consider it like that a temporary variable of

type INT4 is created automatically to take value of

E_OFFLINE.

Regards,

Narinder Hartala

Re: ABAP Objects - Instance of a method

Former Member — Thu, 02 Jun 2005 07:38:52 GMT

Narinder, can you please explain the following to me :

You can call a method via a reference variable, just like :

data: grid type ref to cl_gui_alv_grid.

call method grid->offline( ).

But you also do it like this :

CALL METHOD cl_gui_alv_grid=>offline( ).

What’s the difference between the two, and when do I use the first or second one (when you creating an instance what can I do with it).

Once again thanks !

Rob.

Re: ABAP Objects - Instance of a method

andreas_mann3 — Thu, 02 Jun 2005 08:20:48 GMT

Hi Rob,

look here: (quotation from Sap-library)

...

Outside the class, the visibility of the method depends on whether you can call it at all. Visible instance methods can be called from outside the class using

CALL METHOD <ref>-><meth>...

where <ref> is a reference variable whose value points to an instance of the class. Visible instance methods can be called from outside the class using

CALL METHOD <class>=><meth>...

where <class> is the name of the relevant class.

...

regards Andreas

Re: ABAP Objects - Instance of a method

ssimsekler — Thu, 02 Jun 2005 08:37:18 GMT

Hi Rob

For the functionality of this method:

This method is used to determine if the ALV Grid Control runs without frontend handling.

The ALV Grid Control runs without frontend handling in batch mode ( sy-batch has the value ' X '), in print mode, in combination with CATT and during Web Reporting.

In these cases, you should not create frontend (GUI) objects (e.g. custom containers, etc...) .

Since this method has a 'RETURNING' type parameter, you can call and directly assign its output to a variable.

e.g.


DATA lv_offline TYPE i .
lv_offline = cl_gui_alv_grid=>offline( ) .

You can also call this method in usual way as:


DATA lv_offline TYPE i .

CALL METHOD CL_GUI_ALV_GRID=>offline
   RECEIVING
      E_OFFLINE  = lv_offline .

By the way, you can assign points to posts you find helpful using the scala on the left of each post. By assigning a 10-point or checkin "Solved my own" at left of your original post, you can close your thread.

Regards

*--Serdar <a href="https://www.sdn.sap.com:443http://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.sdn.businesscard.sdnbusinesscard?u=qbk%2bsag%2bjiw%3d">[ BC ]</a>