Macro defination

[Former Member]

Hi Guys,

Can you please expalin me how this MACRO works.what is " check not &2 is initial" in the macro below?

DEFINE mac_error_data.

check not &2 is initial.

g_msgseq = g_msgseq + 1.

move: iest0-company to itab_error-company,

iest0-customer to itab_error-customer,

iest0-bill_no to itab_error-bill_no,

g_msgseq to itab_error-msgseq.

concatenate &1 &2 into itab_error-error_code.

append itab_error. clear itab_error.

clear: error_text.

END-OF-DEFINITION.

[Former Member]

Hi,

It's quite similar with routine if you're familiar with it.

From your sample macro, i can type this as a caller (similar with perform in routine):

mac_error_data varA varB

when come to macro definition (similar with form in routine)

&1 will change to value from varA

&2 will change to value from varB

so this syntax:

check not &2 is initial.

means: check not varA is initial.

Hope it helps,

Victor.

[Sm1tje]

In addition to Victor, all 'variables' within marco definition are socalled placeholders.

[Former Member]

Macros are used whenever we want to execute a piece of code multiple time. Plese see the below example.

Defile calculate.

&3 = &2 + &1.

end of difination.

Loop at itab.

calculate itab-field1 itab-field3 itab-field3.

end loop.

The output will be

itab-field3 = itab-field2 + itab-field1.

suppose itab-field1 = 10

itab-field2 = 5.

then according to the above macro

itab-field3 = 15.

In ur case, macro is check for the second passed variable for example

DEFINE mac_error_data.

check not &2 is initial.

g_msgseq = g_msgseq + 1.

move: iest0-company to itab_error-company,

iest0-customer to itab_error-customer,

iest0-bill_no to itab_error-bill_no,

g_msgseq to itab_error-msgseq.

concatenate &1 &2 into itab_error-error_code.

append itab_error. clear itab_error.

clear: error_text.

END-OF-DEFINITION.

loop at itab.

mac_error_data itab-field1 itab-field12." Macro will be perform only if the itab-field12 is initial

endloop.

[Former Member]

Hi Akal,

In code you call the macro as follows:

mac_error_data VAR1 VAR2.

What macro does:

DEFINE mac_error_data.
check not &2 is initial.                                         "If VAR2 is not initital
g_msgseq = g_msgseq + 1.                                " add 1 to g_msgseq 
move: iest0-company to itab_error-company,         "itab_error-company = iest0-company
iest0-customer to itab_error-customer,                  "itab_error-customer = iest0-customer
iest0-bill_no to itab_error-bill_no,                          "itab_error-bill_no = iest0-bill_no
g_msgseq to itab_error-msgseq.                          " itab_error-msgseq = g_msgseq 
concatenate &1 &2 into itab_error-error_code.       " concatenate VAR1 and VAR2 into itab_error-error_code
append itab_error. clear itab_error.                       " fill itab_error internal table with the above header information
clear: error_text.
END-OF-DEFINITION.

George

[Former Member]

Hi Alka,

Chk this,

Examples of Macro

REPORT ZEX_MACRO .

* Parameter Declaration
Parameters: d_num1 type i,
            d_num2 type i.

* Data Declaration
DATA: d_res TYPE i.

* This Macro performs the operation
DEFINE operation.
  d_res = &1 &2 &3.
  doit   &1 &2 &3 d_res.
END-OF-DEFINITION.

* This Macro gives the result
DEFINE doit.
  write: / 'The result of &1 &2 &3  is', &4.
END-OF-DEFINITION.

Regards,

Nikhil.