Constant what has this got to do with readingHow to create some thing like

Question

Q]     IN  the statement
SABC_ACT_READ(4)               VALUE 'READ',
Taken from
http://help.sap.com/saphelp_46c/helpdata/en/fc/eb3d5c358411d1829f0000e829fbfe/content.htm
SABC_ACT_READ(4) is a of type C , & has a value “4” –what has this got to do with reading   pls explain.
Q]     How to create some thing like this (event) of our own like say read all alphabets that have “s”  in their string?

Answer 1

In order to Use the Function Module 'AUTHORITY_CHECK_DATASET' , you need to Pass the Exporting  Parameter ACTIVITY  with a value like given below.
ACTIVITY
Access type, with the following possible values:
- READ: Read file
- WRITE: Change file
- READ_WITH_FILTER: Read file using filter functions
- WRITE_WITH_FILTER: Change file using filter functions
- DELETE: Delete file
These values are defined as constants and one such constant is SABC_ACT_READ with a type char and length 4 with a Value of 'READ' .
The constant is being used in that Function module to check the READ Authorization of the user for the file specified.
Hope this helps.
Vinodh Balakrishnan