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Message from discussion Problem pasing by reference to DLL
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 More options Sep 17 2012, 1:19 pm
Newsgroups: comp.lang.apl
From: "ABC" <A...@enoemail.com>
Date: Mon, 17 Sep 2012 13:19:25 -0400
Local: Mon, Sep 17 2012 1:19 pm
Subject: Re: Problem pasing by reference to DLL
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Hi, Graham,

Thank you very much.  That was not a long shot, it was the correct answer!

My DSL is written in assembler (MASM).  The APL-PLUS documentation includes
an example of a C++ program that takes two parameters, the pointer and the
length.  However, as I am passing a fixed-length vector, I don't need to
pass the length so I don't have the length parameter.  I didn't realize that
the DLL might need that information even though the program takes only one
input (the pointer).  However, when I specified it as  you (and the
documentation) showed, it worked.

Thanks again for your reply.

"Graham" <h2gt2g42-micenewgro...@yahoo.co.uk> wrote in message

news:ou6dnXMbju2AzcrNnZ2dnUVZ8h2dnZ2d@bt.com...

"ABC" <A...@enoemail.com> wrote in message

news:5eednf4YVtygpcrNnZ2dnUVZ_rSdnZ2d@giganews.com...

> I'm calling a simple DLL from APL-PLUS Win 4.0 using []NA.  The DLL
> accepts
> a DWORD pointer.  Here's the []NA syntax.

> 'DLL I4<-Patterns_03.AddUp(*I4)' []NA 'Patterns_03'

> Then I call it this way:

> A <- (iota) 10

> Patterns_03 (A)

> I get:  LENGTH ERROR

> If I call:  Patterns_03 (A[1]) the DLL returns the correct result for
> A[1].
> The same is true if I pass any index to the end of the vector A -- for
> example, Patterns_03 (A[6]) returns the correct result for A[6].  But my
> []NA shows that I'm passing it by reference, not by value.

> Any ideas?

Here's a long shot!!! Most none array type languages usually require a
pointer to an APL vector followed by the length of that vector. Is it
possible to specify your []NA as:

'DLL I4<-Patterns_03.AddUp(*I4,I4)' []NA 'Patterns_03'

and then call:

Patterns_03 (A) ({rho}A)

ie the pointer is to the first element in A followed by the length of A.
Just a guess.

Graham.


 
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