Re: A command line char parameter with a hex 00 last byte

Great Jon!

Thanks a lot!

El vie, 29 abr 2022 a las 14:52, Jon Paris (<jon.paris@xxxxxxxxxxxxxx>)
escribió:

Javier, you need to educate yourself on how parameters are passed on IBM i.

Basically all program (PGM object) calls are by reference. ALL. The only
thing that is passed is a pointer to the data. So if you pass 10
characters but the called program expects 20 you will see 10 spurious
characters in the parameter received. They will be the 10 characters in
memory that follow the 10 of the actual parameter.

Try reading this https://www.itjungle.com/2016/11/29/fhg112916-story01/

and this:
https://www.itjungle.com/2017/02/20/guru-parameter-passing-fundamentals-programs-versus-procedures/

Also be aware that when passing a parameter from the command line there
are system-wide rules that determine how the parameters sent are
effectively defined. You can find a full description of the rules here:
https://authory.com/JonParisAndSusanGantner/The-Mystery-of-the-Command-Line-Parameters-af036a9909e7d4323a1e16a55440f6c70

Hope this helps.


Jon P.

On Apr 29, 2022, at 1:50 PM, Javier Sanchez <

javiersanchezbarquero@xxxxxxxxx> wrote:

Hi folks:

How do you append a hex 00 byte to a text/char command line parameter?

Example:

CALL MYLIB/MYPROG PARM('My Text/Char parameter' + X'00)

The latter does not work because the plus sign would obviously be taken

as

the second parameter and just then the X'00' would be taken as the third
parameter. Of course that is not what I want.

According to IBM, below, it says that I don't need to do that because the
system automatically appends a hex 00 to the text parameter. Please

check

out this link:

https://www.ibm.com/docs/en/i/7.3?topic=command-call-call-parameter-conversions

But I wrote a small RPG program to test for a hex 00 byte and it doesn't
really do it.

My test program expects a 64-byte single parameter. Then I call it like
this:

CALL MYLIB/MYPGM('my small text parm')

Then within my program, a test for a hex 00 like:

nullBytePos = %SCAN(X'00': text_param);

And it returns zero. What is wrong then?

TIA.

Javier.
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