Re: First C program

If you want to open a file in a function and have its pointer available in main, you must pass pointer to pointer!
Something like this:

int main()
{ 
  _RFILE *fp ;

  openfile(&fp) ;
}

void openfile(_RFILE **fp)
{
  *fp = _Ropen(...) ;
}

(Bad) Alternative is to have it defined as global variable.


-----Original Message-----
From: c400-l-bounces-Zwy7GipZuJhWk0Htik3J/[email protected] [mailto:c400-l-bounces-Zwy7GipZuJhWk0Htik3J/[email protected]] On Behalf Of Frank Kolmann
Sent: Thursday, April 03, 2014 1:43 PM
To: c400-l
Subject: [C400-L] First C program

Hi

I have recoded the program based on suggestions from Barbara and Jevgeni.
I have posted the new source here.
http://wiki.midrange.com/index.php/C_version_of_DISPR
As Barbara suggested I moved the Open of the files into a function.
I had to make the file pointers GLOBAL, to get the program to work.

However if I defined the file pointers in 'main'.
I could not get the function to update the file pointers.
Any suggestions on how to define the pointers for the file OPEN.

I tried this (from compile listing)  ( amongst many other attempts)


  82       |int main(void)
  83       |{
  84       |
  85       |    _RFILE           rpf   ;
==========> .....................a................................
=INFORMATIONAL===> a - CZM0359  Automatic variable rpf contains a
  86     1 |    _RFILE           *pf  = &rpf ;
  87       |    _RFILE           rsubf ;
==========> .....................a................................
=INFORMATIONAL===> a - CZM0359  Automatic variable rsubf contains
  88     2 |    _RFILE           *subf = &rsubf;
  89       |    _RFILE           rsopf ;
==========> .....................a................................
*=INFORMATIONAL===> a - CZM0359  Automatic variable rsopf contains a const member and is not initialised
  90     3 |    _RFILE           *sopf = &rsopf;

Frank Kolmann
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-- 
This is the Bare Metal Programming IBM i (AS/400 and iSeries) (C400-L) mailing list
To post a message email: C400-L-Zwy7GipZuJhWk0Htik3J/[email protected]
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