Visual Basic .net MSComm control

[Tico Tech]

Hi:
I have a question about the Microsoft Communications Control Version 6.0
from visual studio .net.
I have this code:

Dim Buffer As String
Do
Buffer = AxMSComm1.Input() //Error, it does not recognize this
statement.
Loop Until Len(Buffer) > 0
AxMSComm1.PortOpen = False

Could someone tell me why I get this error or where I can find information
on using this ActiveX control. I went to the MSDN website but could not find
any information about this control. The MSDN site only referred me to MSComm
from visual basic 6.0.

Thanks.

 

[Guest]

Do you really need to use the ActiveX control? Personally I wouldn't for .NET, I've used it with VB6 and yes it works fine but for VB.NET I would look at other methods. May be one of the following links will help.

http://support.microsoft.com/default.aspx?scid=kb;en-us;823179
http://www.microsoft.com/downloads/...FamilyID=075318CA-E4F1-4846-912C-B4ED37A1578B
http://www.codeproject.com/dotnet/DotNetComPorts.asp
http://msdn.microsoft.com/msdnmag/issues/02/10/netserialcomm/
http://www.htservices.com/Tools/VBandC/SerialCommunications.htm


Chris.

 

[Charles Law]

Further to this response ...

HTS recommends Corrado Cavallis's web pages, as I too have been pointing
people to for some time. However, there is a major flaw in the code there,
which Corrado is aware of, and is correcting, I believe.

In the meantime, if you use his code - which is otherwise a very good place
to start - I suggest you refer to the article below

http://msdn.microsoft.com/msdnmag/issues/02/10/netserialcomm/

and pay particular attention to the section that describes marshalling of
the overlapped structures. This is very important, and could save you a lot
of heartache when your application mysteriously crashes without so much as a
'by your leave'.

Although I read it at the same time as I came across Corrado's page, I did
not give it my fullest attention, and spent several weeks debugging random
crashes.

HTH

Charles

Do you really need to use the ActiveX control? Personally I wouldn't for

..NET, I've used it with VB6 and yes it works fine but for VB.NET I would
look at other methods. May be one of the following links will help.

 

[Dick Grier]

Hi,

I have a number of examples in my book (see below). Without seeing more of
your code, I cannot be sure what you are doing wrong. You can download
NETComm.ocx from my homepage, which comes with a working example that may
clear things up.

As others have mentioned, there are .NET classes and components available,
that do not rely on an AX control. I provide one in my book, and there are
others available. There is a nice component from Sax Software that is in
the Visual Basic . NET Resource Kit (a free download from Microsoft, or
available for about $5 shipping on a CD-ROM).

Dick

--
Richard Grier (Microsoft Visual Basic MVP)

See www.hardandsoftware.net for contact information.

Author of Visual Basic Programmer's Guide to Serial Communications, 3rd
Edition ISBN 1-890422-27-4 (391 pages) published February 2002.

 

[Guest]

Mark,

I've replied to your message in the DBComm work space. The code works fine.

Chris.

 

[Tico Tech]

Found the solution! No need beat around the bushes...with HTS

Dim Buffer As String
' Wait for data to come back to the serial port.
Do
Buffer = CStr(Me.AxMSComm1.Input())
Loop Until Len(Buffer) > 0
'Display data or do something with it
Me.Text1.Text = Buffer
'Close Port
Me.AxMSComm1.PortOpen = False

Thanks anyway guys.