Communication between c++ and c# applications

[George Chen]

Hi

I have lots applications are already written by emberded c++. It 's easy
to use
PostMessage in one application and catch this message in another
application's WndProc Function.
Here is my c++ code:
App a:
#define WM_SCANBARCODE WM_APP + 100
:ostMessage(HWND_BROADCAST, WM_SCANBARCODE , 0, 0);
App b:
case WM_SCANBARCODE: // WM_SCANBARCODE = WM_APP + 100
break;

Since .net have some powerful library like web service. I use C# to
develop new
application. But I do not know how to using simlar function in C# to
communication to my exist C++ application.



Any help would be appreciate.

George chen

 

[Paul G. Tobey [eMVP]]

Look at the ApplicationEx class in OpenNETCF Smart Device Framework and use
an IMessageFilter instance that you create to detect the message's arrival.
The only situation where that won't work is if you have a modal dialog in
front. There's been a recent discussion of that, too, and you can find that
thread in the archives of the newsgroup:

http://groups-beta.google.com/group...tframework?hl=en&lr=lang_en&ie=UTF-8&oe=UTF-8

Paul T.

 

[Peter Foot [MVP]]

There are a whole range of inter-process commnication options available.
Daniel sums them up well in this article (and part two linked at the end)
http://www.danielmoth.com/Blog/2004/09/ipc-with-cf-on-ce-part-1.html

In your specific example you can use windows messages back and forth between
your managed app and a native app - see the
Microsoft.WindowsCE.Forms.MessageWindow class which you can derive from and
override the WndProc to capture incoming messages, there are also
SendMessage and PostMessage methods.

Peter

 

[Daniel Moth]

For sending WM messages use the Microsoft.WindowsCE.Forms.MessageWindow. For
examples of that and other IPC mechanisms start here:
http://www.danielmoth.com/Blog/2004/09/ipc-with-cf-on-ce-part-1.html

Cheers
Daniel

 

[George Chen]

That is what i want.
Thank all of your's help

George Chen