RE: RJNE0100 format

[michaelr_41@xxxxxxxxxxxxxx]

Hmmm...guess I'm not sure about this after all. I'm using the RCVJRNE
command and the ENTFMT(*TYPEPTR) parameter. The manual says:
"For ENTFMT(*TYPEPTR), the format of this data is the same as RJNE0100
in the Retrieve Journal Entries (QjoRetrieveJournalEntries) API. "

That's why I was using the RJNE0100 format description. The exit program
(that I wrote) is specified in the RCVJRNE command and is passed two
parameters - data in the RJNE0100 format and a 3 byte control field. How
do I specify the first parameter? As a long string (varying length?) and
then use the displacement and offset to determine the positions of the
contents?

- Michael



-----Original Message-----
From: michaelr_41@xxxxxxxxxxxxxx [mailto:michaelr_41@xxxxxxxxxxxxxx] 
Sent: Wednesday, June 30, 2004 4:34 PM
To: Midrange Systems Technical Discussion
Subject: Re: RJNE0100 format


Wow...thanks Scott. I did change the binary to Integer, but thought it
was the Align. I'll make the change you recommend.

- Michael

On Wed, 30 Jun 2004 15:08:12 -0500 (CDT), "Scott Klement"
<midrange-l@xxxxxxxxxxxxxxxx> said:
> 
> On Wed, 30 Jun 2004 michaelr_41@xxxxxxxxxxxxxx wrote:
> >
> > Found it...I didn't specify Align on the data structure and the data 
> > could contain pointers. This seemed to fix it:
> >
> > D JrnEntry        DS                  Align
> >
> 
> That's not why the ALIGN keyword solved the problem, read on...
> 
> [SNIP]
> > BYTESRETURNED OF JRNENTRY = 000000240.
> > HEADEROFFSET OF JRNENTRY = 000000016.
> > JOURNALOFFSET OF JRNENTRY = 000000001.
> > CONTINUATION OF JRNENTRY = '1'
> [SNIP]
> > D JrnEntry        DS
> >  *  Header Entry
> > D  BytesReturned                 9B 0
> > D  HeaderOffset                  9B 0
> > D  JournalOffset                 9B 0
> > D  Continuation                  1
> >  *  Journal Entry Header
> > D  DspNxtJrnHdr                  9B 0
> [SNIP]
> 
> The API is *sending* you a number that tells you how far the "journal 
> entry header" data structure is from the "header" data structure.
> It's called HeaderOffset in your code...
> 
> You are ignoring the value that it sends you in HeaderOffset, and 
> instead hard-coding the position of the header. Since you have 3 
> fields that are 4 bytes long, followed by a field that's 1 byte long, 
> you're hardcoding DspNxtJrnHdr as 13 bytes after the start of the data 
> structure.  When you coded the ALIGN keyword, it forced DspNxrJrnHdr 
> to be aligned on a 4-byte boundary -- so it rounded the 13 up to the 
> next multiple of 4 which is 16.
> By sheer luck, the API happened to pass 16 in the HeaderOffset field, so
> it worked.
> 
> What will you do if the API sends you a different value besides 16 in 
> the HeaderOffset field?  Sure, you can say "it's never done that"  or 
> you can say "if it ever does that, I can change my program" but is 
> that really the right way to write code?
> 
> The "Header", "Journal Entry Header", "Journal Entry Null-Value 
> indicators", and "Journal Entry Specific Data" parts ot JRNE0100 
> should be coded as separate data structures -- as they are in the 
> documentation -- and should be distanced from one another based on the 
> values in the "offset"
> and "displacement" fields.
> 
> Also, the API documentation is calling for BINARY(4) and BINARY(4) 
> UNSIGNED fields... you're using 9B 0 which isn't a true BINARY(4).  9B 
> 0 is a decimal field, not a binary field.  If the number exceeds 
> 999999999, the RPG runtime will chop off the most significant digits.  
> And, in any case, it's a signed field -- the B data type is never 
> unsigned.
> 
> I can't say this enough times -- Unless you're coding at V3R6/V3R1, 
> there's no reason to EVER use the "B" data type in RPG IV.  Use the I 
> and U data types instead.
> 
>   BINARY(4)          = 10I 0 in RPG IV,
>   BINARY(4) UNSIGNED = 10U 0 in RPG IV.
> 
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-- 
  
  michaelr_41@xxxxxxxxxxxxxx
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  michaelr_41@xxxxxxxxxxxxxx