Problem pasing by reference to DLL

[ABC]

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?

Thanks very much.

[Graham]

"ABC" <A...@enoemail.com> wrote in message news:5eednf4YVtygpcrN...@giganews.com...

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.

[ABC]

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-mi...@yahoo.co.uk> wrote in message
news:ou6dnXMbju2AzcrN...@bt.com...