topic Re: Get reference of dynamic data type in Application Development and Automation Discussions

Get reference of dynamic data type

YayatiEkbote — Wed, 23 Dec 2015 06:14:25 GMT

Hello all,

In our custom interface, if there is some error in process, we need to trigger the methods of classes manually. For this , I have a requirement to create a program to trigger the methods . For this, requirement, I am getting the class name and method name and I want to trigger this dynamically.

To trigger the methods dynamically, the parameter table has to be created. The problem I am facing is that the method name comes runtime, hence parameters and their data types are also know runtime. Hence to create the parameter tab, I ha written code as below -

DATA:

t_params TYPE abap_parmbind_tab,

w_params TYPE abap_parmbind.

FIELD-SYMBOLS:

<lf_dtype> TYPE any.

LOOP AT t_params INTO w_params.

w_params-name = 'GUID'.

w_params-kind = 'I'. "Importing parameter type

CALL METHOD go_util->get_datatype

EXPORTING

iv_class_name = gv_class "ZCL_MANUAL_PROC

iv_meth_name = gv_meth "GET_INSTANCE

IMPRTING

ev_datatype = lv_datatype. "BBP_GUID

CREATE DATA dyndata TYPE (lv_datatype).

ASSIGN dyndata->* TO <lf_dtype>.

IF <lf_dtype> IS ASSIGNED.

<lf_dtype> = p_data.

ENDIF.

GET REFERENCE OF <lf_dtype> INTO w_params-value.

MODIFY t_params FROM w_params.

CLEAR w_params.

ENDLOOP.

CALL METHOD (gv_class)=>(gv_meth) "static public methods are called

PARAMETER-TABLE

t_params.

get_datatype is a custom method from custom utilities class which has a query to table ' seosubcodf ' which returns parameters of methods and their datatypes.

I am getting an exception of type 'CX_SY_DYN_CALL_ILLEGAL_TYPE' when method is called. The exception description says -

The reason for the exception is:

When dynamically calling the method "GET_INSTANCE" of the class

"ZCL_MANUAL_PROC", the parameter

"IV_GUID" was transferred with the incorrect parameter type.

Could anyone please tell me what is the wrong thing which I am doing in above coding because of which I am getting dump?

Regards,

Yayati

Re: Get reference of dynamic data type

former_member210008 — Wed, 23 Dec 2015 06:36:28 GMT

Hi.Check parameter's names of your method. You added GUID to parmbind table, but exception said that you have wrong IV_GUID param.

Also if method have IMPORTING section, you must set it parameter KIND to CL_ABAP_OBJECTDESCR=>EXPORTING, for EXPORTING section in must be CL_ABAP_OBJECTDESCR=>IMPORTING.


REPORT ztest.
 
 CLASS class DEFINITION.
   PUBLIC SECTION.
   CLASS-METHODS m1 IMPORTING iv_1 TYPE string.
 ENDCLASS.
 
 CLASS class IMPLEMENTATION.
   METHOD M1.
     WRITE:/ iv_1.
   ENDMETHOD.
 ENDCLASS.
 
 START-OF-SELECTION.
 DATA(class) = 'CLASS'.
 DATA(method) = 'M1'.
 
 DATA parmtable TYPE abap_parmbind_tab.
 
 insert VALUE #( name = 'IV_1' kind = CL_ABAP_OBJECTDESCR=>EXPORTING value = ref #( `text` ) ) INTO TABLE parmtable.
 
 try.
 CAll METHOD (class)=>(method)
   PARAMETER-TABLE parmtable.
 CATCH cx_root.
   WRITE:/ 'fail'.
 ENDTRY.

Re: Get reference of dynamic data type

YayatiEkbote — Wed, 23 Dec 2015 08:47:41 GMT

Hello Evgeniy,

Thanks for your quick reply. I understood the problem in my code using your code snippet. The method has importing parameter but when you display it in a program, it is exporting. So when type of parameter is 'I', I should pass 'E'. But I have a doubt about 'Returning' type of parameter. Should it be changed to 'I' as well?

Regards,

Yayati

Re: Get reference of dynamic data type

former_member210008 — Wed, 23 Dec 2015 08:57:13 GMT

It should be CL_ABAP_OBJECTDESCR=>RETURNING.

You can find all possible values in CL_ABAP_OBJECTDESCR class. Look at attributes with ABAP_PARMKIND type.

Also check abap help for dynamic call method. You will find there few examples.