Callback function from c++ DLL

I have found many examples that I thought may help but I cannot get my head around callback functions from the c++ DLL.

I have the following code

global.cs

Code:

---

        [DllImport("my.dll")]
        unsafe public static extern UInt16 RegisterDetectCallback(void* detectCallbackFunction);

---

In my own code I have tried a few things but basically want the following functionality

program.cs

Code:

---

public void DetectCallback()
{
    // some functionality...
}

private void button1_Click(object sender, EventArgs e)
        {
                //various code...
                UInt16 result = DLLFunctions.RegisterDetectCallback(DetectCallback());
        }

---

I have tried a few things without success, can anybody point me in the right direction please? i know the above is incorrect as the DLL requires a pointer and i'm trying to pass a function, but hopefully the intention is clear.

Also is it possible to do this without unsafe code? without changing the c++, or is this a requirement when passing functions as parameters in this way?

Thanks

Matt

I don't have a ton of experience in this realm, but you just cannot get a pointer without going into unsafe code (not the same as a reference). Your code is not passing in anything at all. I think that you will need to go into an unsafe context here, which isn't really bad if you know what you are doing.

I have fixed my code thanks to the link in another thread 'interop of native c...'

The working code is:

global.cs

Code:

---

        public delegate void DetectCallback();
        [DllImport("my.dll")]
        unsafe public static extern UInt16 RegisterDetectCallback(DetectCallback myDetectCallback);

---

program.cs

Code:

---

public void myDetectCallback()
{
    // some functionality...
}

private void button1_Click(object sender, EventArgs e)
        {
                //various code...
                UInt16 result = DLLFunctions.RegisterDetectCallback(myDetectCallback);
        }

---

Thanks,

Matt