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

[Scott Klement <midrange-l@xxxxxxxxxxxxxxxx>]

Javier,

The link you posted is to the ILE C/C++ Programmer's Guide.  And indeed, 
for ILE C/C++ it does add the x'00' automatically to the end of the 
parameter.

It does not for RPG, however.  You'd have to add it yourself.

One way is to write your own command.  In the CPP do something like

DCL VAR(&NULL) TYPE(*CHAR) LEN(1) VALUE(X'00')

CHGVAR (&OUTPARM) VALUE(&INPARM *TCAT &NULL)

CALL THEPGM PARM(&OUTPARM)

Or better yet create the command so that it prefixes the character 
parameter with its length, which is more RPG-like.

-SK


On 4/29/2022 12:50 PM, Javier Sanchez 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.