Re: Question about reading IFS text files with C read

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Hi Marvin,

To be clear, what you're referring to here are not C APIs.  These are 
the system open, read, close, etc APIs.  The C ones are named fopen, 
fread, etc.

You say that you're missing the first two bytes of the file.  The only 
time I'm aware of that happening would be when the file is Unicode file 
with a byte order mark.  In that case, the byte order mark is 
automatically stripped, as it's not data used by the application, it's 
metadata used to identify the character encoding.

Aside from that, I'm not sure what would cause it to skip bytes.  Can 
you provide more information?  In order to help in that case, I'd need 
full information on how to reproduce the problem.

-SK


On 2/13/2018 10:37 AM, Marvin Radding wrote:
> I am trying to read a text file on the IFS with the C routines. I used Scott Klement's "Working with the IFS in RPG IV" document as my starting point.
>
> The problem I am having is that it seems to be skipping the first two byes of the file.  Here is my code
>
> dcl-s temp char(32700) inz;
>
> xmlfd = open(path:O_RDONLY+O_TEXTDATA);
> if xmlfd < *zero;
>    die('open(xmlread) read: '+%str(strerror(errno)));
> endif;
>
> //------------------------------------------------------------
> // Read eApp XML file
> //------------------------------------------------------------
> %subst(temp:1:32700) = *blank;
> count = read(xmlfd:%addr(temp):32700);
>
> After the read is executed,  in debug mode, I look at temp and it is missing the first two bytes of the file.
>
> What am I doing wrong?
>
> Marvin