C＃互操作与非托管DLL

Question

What I am trying to make is a CUDA accelerated fractal generator. I want to use c# to create the ui, but the fractal images are being generated by unmanaged cuda c compiled in a dll. Following some tutorials, I have managed to make interop work with simple data, but I am having difficulty creating the bitmap image and passing it back to the c# application.

I can put together a buffer in the dll with the pixel data succesfully using CUDA, but how can I use the pointer to that buffer to make a bitmap in the c sharp application?

Answer 1

One out of some ways to do that:

If your native function looks like:

void foo(void *bitmap);

You can use P/Invoke to declare:

[DllImport(...)]
public static unsafe void foo(void *bitmap);

and then use it as follows:

unsafe
{
    byte[] buffer = new byte[...];
    fixed (void *pBuffer = buffer)
    {
        foo(pBuffer);
    }
}

Notice that you should allow unsafe code (in the project settings, Build tab).