Calling C# from unmanaged C++

[Fernando Cacciola]

Calling C# from unmanaged C++:

Is there any way to do this without COM?

I have an unmanaged processing class and "all I want" is a way to give
progress feedback into the C# client code.

I basically just need to call an "Inc()" method into some managed progress
bar
(And to consult a "IsUserAborted" too)

Any idea on how to do this? May be using something not language related,
like a windows message or so... I don't know

TIA

Fernando Cacciola
SciSoft

 

[Jeff Louie]

Fernando... My understanding is that you can implement a C++ callback
using a delegate in C#. Watch for word wrap

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide
/html/cpconusingcallbackfunctions.asp

Regards,
Jeff

I have an unmanaged processing class and "all I want" is a way to give

progress feedback into the C# client code.<

 

[Fernando Cacciola]

Fernando... My understanding is that you can implement a C++ callback
using a delegate in C#. Watch for word wrap

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide
/html/cpconusingcallbackfunctions.asp

Great, thanks.. that's a start....
I actualy need to pass down a class member...
But maybe I just need to add the hidden "this" in the 'C' version...
OK, I'll play with it...
In any event, I have the basic mechanism.

Thank you!

Fernando Cacciola
SciSoft

 

[Fredrik Wahlgren]

Calling C# from unmanaged C++:

Is there any way to do this without COM?

Sure you can. You can use SendMessage to send something to a window.

/ Fredrik

 

[Sahil Malik]

Multiple ways to do this -- SendMessage is one, but uhhh .. not my favorite
!! because it could get confused if it can't find the right window (which
it finds by window title and window classname).

Anyway, look at Kernel32.dll->MoveMemory
Kernel32.dll->CreateFileMapping
Kernel32.dll->OpenFileMapping

These guys allow two processes to intercommunicate.

- Sahil Malik
http://dotnetjunkies.com/weblog/sahilmalik

 

[Fredrik Wahlgren]

Multiple ways to do this -- SendMessage is one, but uhhh .. not my favorite
!! because it could get confused if it can't find the right window (which
it finds by window title and window classname).

Anyway, look at Kernel32.dll->MoveMemory
Kernel32.dll->CreateFileMapping
Kernel32.dll->OpenFileMapping

These guys allow two processes to intercommunicate.

- Sahil Malik
http://dotnetjunkies.com/weblog/sahilmalik

You are absolutely right. Generally speaking, it may get confused. In this
case, I think it makes sense since Fernando said:
"I have an unmanaged processing class and "all I want" is a way to give
progress feedback into the C# client code."
I assume there is an open window. It's not one of my favorites either but I
think it comes in handy every once in a while.

/ Fredrik

 

[Fernando Cacciola]

You are absolutely right. Generally speaking, it may get confused. In this
case, I think it makes sense since Fernando said:
"I have an unmanaged processing class and "all I want" is a way to give
progress feedback into the C# client code."
I assume there is an open window. It's not one of my favorites either but
I
think it comes in handy every once in a while.

Indeed, in my case I do have a window, the one holding the progress bar
control, so this works fine.
Using a Memory Mapped File, as Sahil suggested can also work.
And of course, a plain callback as Jeff mentioned

Well, I'll see which on is better in my case, thanks to you all.

Fernando Cacciola