RE: global pgm variable and file field with same name and attributes

Thanks all.

Mark, I knew that already - the programmer creating the file did not respect the naming standard and seemed to think there was a difference between upper and lower cases. I will sort him out later! By the way, my mail to your private address always gets sent back to me!

Thanks Rory for confirming my assumption and Barbara for the under the covers explanation that I will need to save somewhere.

-----Message d'origine-----
De : rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] De la part de Mark S. Waterbury
Envoyé : mardi 25 janvier 2011 18:19
À : RPG programming on the IBM i / System i
Objet : Re: global pgm variable and file field with same name
and attributes

David:

RPG IV is not case sensitive, so "gPgmId" is equivalent to "GPGMID".

The RPG compilers do not complain if you define the same
variable name on a D-spec that is also defined in an
externally described file, unless the type, length or decimal
places are defined differently.

Perhaps your naming standards could be amended to help avoid
this situation. For example, if a "g" prefix denotes a
"global" variable, then "GPGMID" should not be permitted as a
field name in an externally described database file. Or, you
perhaps could change the "global"
prefix to something like "g_" for internally declared variable names.

HTH,
Mark S. Waterbury

Hi,

I hope someone will be able to explain this to me.

In this program, it looks like the programmer thought that

coding gPgmId was different to GPGMID.

In the code, a file containing field GPGMID is read into

display file field EPGMID. Then the global variable gPgmId is
populated with EPGMID, read from a subfile.

D Main_procedure PI
D gPgmId S Like(....)

/free
CAllp subproc
gPgmId = EPGMID;
/end-free

In subproc :
EPGMID = GPGMID;


In the compiler listing, GPGMID appears once in the list of

global variables. The source numbers next to it show that it
does not seem to differentiate between the global variable
declared by the programmer and the global field from the file.

So can anyone tell me what is actually happening in the program ? I
think there is a danger that by coding gPgmId = EPGMID; It

is really initialising the file field GPGMID.

Références de zone globales :

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