You better believe it!

It is not prototypes you don't understand but rather the calling mechanisms the system uses.

When calling procedures, passing by value means that the actual data (i.e. 10 bytes in your case) is pushed onto the stack. When calling by reference (including Const parms) a pointer (16 bytes) is pushed on the stack.

For program calls only pass by reference is supported.

Check out this article which goes into parameter passing differences. https://www.itjungle.com/2017/02/20/guru-parameter-passing-fundamentals-programs-versus-procedures/ <https://www.itjungle.com/2017/02/20/guru-parameter-passing-fundamentals-programs-versus-procedures/>


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

On Dec 19, 2018, at 1:58 PM, John Yeung <gallium.arsenide@xxxxxxxxx> wrote:

Hm. Some very simple tests using *ENTRY parameters and dates expressed
as 10-character ISO strings (without embedded quotes) worked. For
example, '2018-12-25' was recognized as a valid date, and was
successfully operated on by the called RPG program.

Which leaves me in the uncomfortable position of admitting that I
really don't understand ILE prototypes well enough. Does it make a
difference whether the date parameter in question is defined as
pass-by-value?

I should mention that another procedure in the same service program
was called successfully through the iSrvPgm interface, but it had no
parameters and only returned a numeric value.

John Y.
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