IBMi (AS400) fans only - How to call a C runtime function from RPG program.

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This example comes from https://www.ibm.com/support/pages/coding-rpg-iv-beginners-tutorial
This example calls the C runtime printf() function to print a message to the standard output instead of to the external message queue.




       // This sample comes from
       // https://www.ibm.com/support/pages/coding-rpg-iv-beginners-tutorial
       //
       // This example calls the C runtime printf() function to print a message
       // to the standard output instead of to the external message queue.


       /if defined(*CRTBNDRPG)
         ctl-opt dftactgrp(*no)
                 actgrp(*new);
       /endif
       ctl-opt option(*srcstmt);

       dcl-s num int(10) inz(25);

       print ('This message is much longer than the 52 '
            + 'characters that DSPLY allows. '
            + 'The value of variable "num" is ' + %char(num));
       return;

       dcl-proc print;
          dcl-pi  *n;
             msg varchar(5000) const;
          end-pi;
          dcl-pr printf extproc(*dclcase);
             template pointer value options(*string);
             dummy int(10) value options(*nopass);
          end-pr;
          dcl-c NEWLINE x'15';

          printf(msg + NEWLINE);
       end-proc print;


Compile this program (CRTBNDRPG) and run it:

CALL MyProgram

I appreciate all the comments made on this blog.

Comments

  1. AnonymousMarch 10, 2023 at 2:20 AM

    Just FYI, X'25' is the newline character since about 2004 when it was "corrected" from the X'15'. The X'15' still kind of works, mostly.

    ReplyDelete

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