[Mono-list] calling a delegate from unmanaged code to managed code

[GaoXianchao]

hi all,

I want to call a delegate from unmanaged code to managed code.
For some reson, I can't pass the delegate to unmanaged code every
time.So, I remember the delegate in the unmanaged code.

But, the garbage collector will move the delegate object in memory,
how can i avoid this?

thanks a lot!

my code like this:

-------------------------------------------------------
test.h:

typedef void(*callback)(int a, int b);

void set_callback(callback ck);

void update(int a, int b);

-------------------------------------------------------

test.c:

callback g_callback = 0;

void set_callback(callback ck)
{
    g_callback = ck;
}

void update(int a, int b)
{
    if(g_callback != 0)
    {
        g_callback(a, b);
    }

    do_other(a, b);
}

------------------------------------------------------

test.cs

    class Program
    {
        public delegate void callback(int a, int b);

        [DllImport("test")]
        public static extern void set_callback(callback ck);
        [DllImport("test")]
        public static extern void update(int a, int b);

        static void Main(string[] args)
        {
            callback ck = new callback(OnCallback);

            set_callback(ck);

           //long time run...
            while(!_toExit)
            {
                 update(1,2);
            }
        }

        static void OnCallback(int a, int b)
        {
            Console.WriteLine("a:" + a.ToString() + " b:" + b.ToString());
        }
    }