ABAP Objects - Instance of a method

Question

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

Answer 1

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 .
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Regards
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