Re: POI/HSSF Question

Thank you, Scott. I love this stuff. but it's not like the old days, when
I could find everything I needed in my trusty IBM manuals.

Arthur J. Marino
Southern Container Corporation
(631) 297 - 2276



Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>
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02/22/2008 01:51 PM
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Re: POI/HSSF Question






Hi Arthur,

Excel date expressed as a "jdouble" (days since 01-01-1900) and
returns an RPG Date field. But since I don't know how to define a
"jdouble" field, I'm stuck.

jdouble is just an alias for RPG's 8F (8-byte floating point) data type.
Assuming that you have the HSSF_H copy book in your code, you can
declare your jdouble variable as follows

D myVar s like(jdouble)

That definition is equivalent to coding:

D myVar s 8F

The only reason I chose to use 'jdouble' instead of '8F' is because it
makes it easier to match up the data with Java. In Java the data type
is called 'double', so 'jdouble' is shorthand for "Java double". But...
Java's double data type is identical to RPG's 8F data type, so it
doesn't matter which version you use.

If you look at the JNI copy book provided by IBM in the QSYSINC library
(i.e. QSYSINC/QRPGLESRC member JNI) that's where 'jdouble' is defined.
You'll see this:

D DS BASED(JNItypes_P)
D jbyte 1 1I 0
D jshort 1 2I 0
D jint 1 4I 0
D jlong 1 8I 0
D jlongJNI 8A OVERLAY(jlong)
D jboolean 1 1U 0
D jchar 1 2C
D jfloat 1 4F
D jdouble 1 8F
D jsize 1 4I 0

As you can (hopefully) see... jdouble is defined as an 8F field. So
when you use like(jdouble), it's making your field defined the same as
the one above, from teh copy book. (if you include the HSSF_H copy
book, HSSF_H will, in turn, bring in the JNI one, since HSSF_H needs the
definitions from it...)

Hope that helps.