Re: How to pass variant (array of bytes) to winsock.ocx

From:

=?Utf-8?B?bXhh?= <mxa@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 11 Jun 2006 09:38:02 -0700

Message-ID:

<E4B08E25-61AB-464C-9115-409B89F1BAC3@microsoft.com>

Well, like I said in my first post, the GetData seems to work fine when I
define the variant as a BSTR (see BSTR example below), however when I define
the variants (var and varType) to retrieve the data as a array of bytes, the
call to the GetData NEVER RETURNS- therefore i can't read the data to answer
your question. Here is the code again that I use for an array of bytes that
does not work:

void CWme_rwDlg::OnDataArrivalRxwfsock( long bytesTotal)
{
   COleVariant var, varType, varLth(bytesTotal)
   varType.iVal = VT_ARRAY | VT_I1);
   varType.vt = VT_I2;

// GetData(VARIANT *data,
// const VARIANT &type,
// const VARIANT &maxLen)
   GetData( &var, varType, varLth); // Winsock control getdata

   AfxMessageBox("Get Data Succeeded");
}

I never get to the AfxMessageBox statement after the call to GetData. If
you see below, I show a code snipet that uses BSTR's to retrieve the data and
that works, however I needed a byte array.

Thanks for your suggestion on using CAsynchSocket and that's probably the
way I've been leaning towards. I just started on the winsock.ocx path (I've
used winsock in VB in the past) and couldn't understand why it would not work
with byte arrays but work fine with BSTR's. I figured it was easier to fix
a simple mistake in my code, then re-do my code using CAsyncSocket - but it
looks like that's the way I'm going.

"Joseph M. Newcomer" wrote:

Do not use CSocket. Use CAsyncSocket. Then define what you mean by "can't receive the
data".
joe

On Sat, 10 Jun 2006 08:26:01 -0700, mxa <mxa@discussions.microsoft.com> wrote:

Kurt, thanks for the suggestion. It's exactly what I've been doing since I
didn't get a response from anyone, and after many failed attempts using the
OCX. It's just funny that I can send data fine, but I can't receive the
data.

Thanks for your response and suggestion.

"Kurt" wrote:

Why not use one of the MFC classes like CSocket instead of the winsock.ocx?

"mxa" <mxa@discussions.microsoft.com> wrote in message
news:AEDFF613-F746-4962-9533-46B3C2D42DEA@microsoft.com...

I'm attempting to use Winsock.ocx in a Visual Studio 6.0, C++ application
and
I have a question on how to pass variants to a winsock GetData function
defined as follows: GetData(VARIANT *data, const VARIANT &type, const
VARIANT
&maxLen).

I have no problems with other functions, but this particular function
never
returns if I make the call with the VARIANT *data defined as a byte array.

My question, is how would I go about getting the data as an Array of
Bytes?

What has worked is when I call the GetData as follows defining a BSTR
type:

void CWme_rwDlg::OnDataArrivalRxwfsock( long bytesTotal)
{
   COleVariant var, varType, varLth(bytesTotal)
   varType.iVal = VT_BSTR;
   varType.vt = VT_I2;
   GetData( &var, varType, varLth); // Winsock control getdata
function
   Cstring str = (BSTR) var.bstrVal;
   AfxMessageBox(str);
}

The above code works when sending a BSTR. However, I want to send an
array
of bytes and have attempted to the following:

void CWme_rwDlg::OnDataArrivalRxwfsock( long bytesTotal)
{
   COleVariant var, varType, varLth(bytesTotal)
   varType.iVal = VT_ARRAY | VT_I1);
   varType.vt = VT_I2;
   GetData( &var, varType, varLth); // Winsock control getdata
function
   AfxMessageBox("Get Data Succeeded");
}

The number of bytes transmitted matches the number of bytes received,
however when I call the GetData function, it never returns. I'm assuming
I'm defining something incorrectly and was wondering if someone can
provide
me with some advice?

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Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm