There is a very good ABAP Programming Guidelines, it’s pdf version. If you want to download it,pls refer below link.
Official ABAP™ Programming Guidelines

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How to get local print machine information? Pls check below program.

DATA: PRDEFAULT LIKE FRPRLIST-PRNAME ,
IS_FRONTEND LIKE RSPOTYPE-MODE .
DATA: LIST LIKE FRPRLIST OCCURS 0 WITH HEADER LINE.
 
CALL FUNCTION ‘RSPO_FRONTEND_PRINTERS_FOR_DEV’
EXPORTING
DEVICE [...]

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