problem implementing a com component callback procedure

Hi

I am working with a com component, which I have added a reference to in my C#. I am using windows vista (32 bit) and VS2005.

I have to implement a callback object which handles data being returned from the com object, which derives from an interface called IDeviceEvents which is part of the com component, which I have attempted to do in my c# code:

Code:

---


unsafe class cFM2Notify : IDeviceEvents
{
    public string m_CallbackEvent = "";

    public void NotifyData(IFM2DeviceEvents CallbackData)
    {
    }

    public string CallbackEvent
    {
        get
        {
            return m_CallbackEvent = CallbackEvent;
        }

        set
        {
            CallbackEvent = m_CallbackEvent;
        }
    }
}

---

This is a shortened version - there are actually a few more properties and methods that I am required to implement, other than the ones shown.

The code builds ok, however, it falls over when run, a StackOverflowException being generated.

My VB.net colleague has suggested that I make the class com visible by prefixing the cFM2Notify declaration with[ComVisible(true)]. However I still a StackOverflowException being generated.

Any ideas on what I am doing wrong?

Cheers

Simon

You're not writing VB here you know : we have the 'return' keyword in C# for returning values from functions.

The problem lies in your CallbackEvent property - it should be :

Code:

---

    public string CallbackEvent
    {
        get
        {
            return m_CallbackEvent;
        }

        set
        {
            m_CallbackEvent = value;
        }
    }

---

If you've coded your other properties the same way then they will need changing too.

Darwen.

Hi Darwen

Thanks for the reply, it now works. Rather silly mistake on my part

thanks again

simon