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Hi guys ... Reg passing array frpom VB

surender_527 Posted: Tue Jan 04, 2005 11:00 am

Joined: 04 Jan 2005

Posts: 1

Hi guys ... Reg passing array frpom VB

Hi guys.

This is Surender . I have a question .

1. How to pass an Array from VB to VC++ DLL

Can any 1 help me . I`ll be gr8full .
Pls. Mention some code
Waiting for reply as soon as possible....

Thank q
-Surender.
--
Surender Ameelpur
surcom527@...

mayank_khare@... Posted: Tue Jan 04, 2005 3:34 pm

Joined: 04 Jan 2005

Posts: 2

Hi guys ... Reg passing array frpom VB

Hi Surender
I believe the problem is in the way that VB stores the arrays. It keeps a
header around to help it do its access. when you pass an array to a DLL, you
do it by not using the ByVal, and passing the first element. What gets sent
is the address, which you then use as a pointer to the rest of the array.

further u can get a code from the following URL...

http://www.codeproject.com/dll/ctovbarray_passing.asp

Bye
Thanks & Regards
Mayank Khare

>From: "Surender Ameelpur" <surcom527@...>
>Reply-To: Programmers-Town@yahoogroups.com
>To: Programmers-Town@yahoogroups.com
>Subject: (PT) Hi guys ... Reg passing array frpom VB
>Date: Mon, 03 Jan 2005 21:00:22 -0800
>
>
>
>
>Hi guys.
>
> This is Surender . I have a question .
>
>1. How to pass an Array from VB to VC++ DLL
>
>Can any 1 help me . I`ll be gr8full .
>Pls. Mention some code
>Waiting for reply as soon as possible....
>
>
>Thank q
>-Surender.
>--
> Surender Ameelpur
> surcom527@...
>
>
>
>

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kith_kahnan Posted: Thu Jan 06, 2005 12:04 am

Joined: 04 Jan 2005

Posts: 13

Hi guys ... Reg passing array frpom VB

>
>
> Hi Surender
> I believe the problem is in the way that VB stores the arrays. It keeps
a
> header around to help it do its access. when you pass an array to a DLL,
you
> do it by not using the ByVal, and passing the first element. What gets
sent
> is the address, which you then use as a pointer to the rest of the array.
>
> further u can get a code from the following URL...
>
> http://www.codeproject.com/dll/ctovbarray_passing.asp
>
>
> Bye
> Thanks & Regards
> Mayank Khare
>
>
>
> >From: "Surender Ameelpur" <surcom527@...>
> >Reply-To: Programmers-Town@yahoogroups.com
> >To: Programmers-Town@yahoogroups.com
> >Subject: (PT) Hi guys ... Reg passing array frpom VB
> >Date: Mon, 03 Jan 2005 21:00:22 -0800
> >
> >
> >
> >
> >Hi guys.
> >
> > This is Surender . I have a question .
> >
> >1. How to pass an Array from VB to VC++ DLL
> >
> >Can any 1 help me . I`ll be gr8full .
> >Pls. Mention some code
> >Waiting for reply as soon as possible....
> >
> >
> >Thank q
> >-Surender.
> >--
> > Surender Ameelpur
> > surcom527@...
> >

I think you`ll need to use COM in C++ with horrible IDispatch
implementation. In particular, with the SAFEARRAY structure (look at
msdn.microsoft.com for more on this).

Regards,
Fernando.

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