CallBack function from c# to c++

Question

I have a C# exe and some vc++ dll's . I am creating a callBackFunction in C# whichh takes structure as its Parameters. My c++ dll will fill this structure and return it back.But 95% of the time My Exe crashes. My dll is multi threaded and my C# has backgroundWorker in it. I have put try catch block to check if any exceptions are coming or not but no exception is being caught. Can any one suggest a better way to send data from my vc++ dll to c# exe

You need to put in example code. There are a number of different ways of passing parameters and handling C++ callbacks, any of which can go horribly wrong if done incorrectly. Be aware also that in spite of what the documentation says, .NET has a habit of garbage collecting managed thunks out from under C++. — plinth
– plinth, Commented Feb 18, 2010 at 14:20

Vlad · Accepted Answer · 2010-02-19 18:56:13Z

1

this must work:
(c#)

namespace Test
{
    public class CallbackClass
    {
        public void Callback(string s)
        {
            MessageBox.Show(s);
        }
    }
}

(c++/cli)

...
Test::CallbackClass::Callback(gcnew System::String("woof!");
...

answered Feb 19, 2010 at 18:56

Vlad

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Adrian Fâciu · Accepted Answer · 2010-02-18 14:22:47Z

0

If you want you could implement a COM Interface, and then you could call the methods from that interface from any .Net client.

Basic example of implementation.

answered Feb 18, 2010 at 14:22

Adrian Fâciu

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