关于调用C kernel functions

1、检查用户是否有权限从abap里调用C kernel functions
权限对象 S_C_FUNCT.
相关参数说明:

• PROGRAM: Name of the ABAP/4 program that contains the call. If no program name is specified, the system assumes the current program.

• ACTIVITY: Access type. The possible values are: CALL: Call C kernel function

• FUNCTION: Name of the C kernel function

示例：
TYPE-POOLS SABC.
CALL FUNCTION 'AUTHORITY_CHECK_C_FUNCTION'
     EXPORTING  PROGRAM          = 'ZCALLTST'
                ACTIVITY         = SABC_ACT_CALL
                FUNCTION         = 'SYSTEM'.
     EXCEPTIONS NO_AUTHORITY     = 1
                ACTIVITY_UNKNOWN = 2.

2、ABAP变量类型和C变量类型对应表

basetype	ABAP-Datentyp	Typ in C
C	c with length specification	SAP_CHAR (*) [Length]
C_GENERIC	c without length specification	SAP_CHAR*
X	x with length specification	SAP_RAW (*) [Length]
X_GENERIC	x without length specification	SAP_RAW*
N	n with length specification	SAP_CHAR (*) [Length]
N_GENERIC	n without length specification	SAP_CHAR*
P	p with lengthening and decimal indication	SAP_BCD (*) [Length]
P_GENERIC	p without lengthening and decimal indication	SAP_BCD*
D	d	SAP_DATE*
T	t	SAP_TIME*
I	i	SAP_INT*
F	f	SAP_DOUBLE*
STRING	string	StrRef*
XSTRING	xstring	StrRef*
INT2	s	SAP_SHORT*
INT1	b	SAP_INT1*
TABLE	all Tabel references	TABH_REF*
OBJ_REF	all object references	ObjRef*
DATA_REF	all data references	FldRef*
STRUCT	all structure types	registrierter Typ ctype*
ANY	ANY	void*
DATA	DATA	void*
SIMPLE	SIMPLE	void*
CSEQUENCE	CSEQUENCE	void*
XSEQUENCE	XSEQUENCE	void*
NUMERIC	NUMERIC	void*
CLIKE	CLIKE	SAP_CHAR*
C_POINTER	%_C_POINTER	void**