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From: Accutrol on 22 Oct 2009 21:04
I am interested to know how to communicate with another program using
Windows messaging from LabVIEW. I did not develop the program with which I
want to communicate. The developer allows other programs to interact with
it using Windows messaging.

I need to post messages to that application and receive messages from that
application. The application does not use Windows message ID's. Instead it
uses a message name. The message ID can be determined using a Win32 call,
RegisterWindowMessage().

National Instruments has an example LabVIEW 5.1 program with a C++ DLL that
receives messages, although it does not post messages. It works with
message ID's. Unfortunately, I cannot even get the C++ to compile using
Microsoft C++ 6.0. Something about "redefinition of Occur".

The developer of the application knows that they have customers who are
interfacing with their software using LabVIEW. The developer does not know
the particulars. But they did say that some big name companies are doing
it. Darn, I wish I had their budget.

I attempted to write a VB.NET 2.0 Windows control and use WndProc() to
handle messages. It just sat there. Even when I called it from a VB.NET
2.0 containing form. It responds to messages from the application, but not
from an external application.

I have a VB.NET 1.1 program that overrides WndProc() in the Windows form.
It behaves. I can receive messages and post messages. Now if I can only
teach LabVIEW how to do that!

I am an application programmer. I did not expect to have to get this
intimate with Windows. Is there someone who has done this from LabVIEW or
can steer me through some of the issues. I would be delighted.

Thanks,
Hamilton Woods


From: Anony on 23 Oct 2009 10:41
Accutrol wrote:
> I am interested to know how to communicate with another program using
> Windows messaging from LabVIEW. I did not develop the program with which I
> want to communicate. The developer allows other programs to interact with
> it using Windows messaging.
>
> I need to post messages to that application and receive messages from that
> application. The application does not use Windows message ID's. Instead it
> uses a message name. The message ID can be determined using a Win32 call,
> RegisterWindowMessage().
>
> National Instruments has an example LabVIEW 5.1 program with a C++ DLL that
> receives messages, although it does not post messages. It works with
> message ID's. Unfortunately, I cannot even get the C++ to compile using
> Microsoft C++ 6.0. Something about "redefinition of Occur".
>
> The developer of the application knows that they have customers who are
> interfacing with their software using LabVIEW. The developer does not know
> the particulars. But they did say that some big name companies are doing
> it. Darn, I wish I had their budget.
>
> I attempted to write a VB.NET 2.0 Windows control and use WndProc() to
> handle messages. It just sat there. Even when I called it from a VB.NET
> 2.0 containing form. It responds to messages from the application, but not
> from an external application.
>
> I have a VB.NET 1.1 program that overrides WndProc() in the Windows form.
> It behaves. I can receive messages and post messages. Now if I can only
> teach LabVIEW how to do that!
>
> I am an application programmer. I did not expect to have to get this
> intimate with Windows. Is there someone who has done this from LabVIEW or
> can steer me through some of the issues. I would be delighted.
>
> Thanks, Hamilton Woods

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