I have a struct in C with a function ptr in a dll called Image.dll:
The functionptr is initialized and called in the C-code
The application completes the above operation and then terminates with
an exception of System.OutOfMemoryException

//------------C-Code---------------//
typedef struct _IMG
{
  char **ptr;
  void (*release)();
}IMG;

void releaseimg()
{
printf("Iam over here");
}

void dosomething(IMG* img)
{
img->release = releaseimg();
img->release();
}

//------------C#-Code---------------//
public delegate void releasefunc();

[StructLayout(LayoutKind.Sequential, Pack=1)]
unsafe public struct IMG
{
   public char ** ptr;
   public releasefunc release;
};

[DllImport("Image",EntryPoint = "DoSomething",ExactSpelling =
true,CharSet = CharSet.Ansi,CallingConvention =
CallingConvention.Cdecl)]
public static extern void dosomething(ref IMG);

img = new IMG();

dosomething(ref img);

//----Apps crash here after completing the function
//---- Error is System.OutOfMemoryException