Pass Managed Function Pointer As Unmanaged Callback

Question

I am attempting to pass a managed function pointer void (*)(void *) to my unmanaged library. My unmanaged library calls this callback with a pointer to a frame

Answer 1

EDIT: not a problem with cross-thread calls. If the unmanaged caller expects to call a __cdecl function, then you have to decorate the delegate type with an UnmanagedFunctionPointerAttribute attribute.

using namespace System::Runtime::InteropServices;

[UnmanagedFunctionPointerAttribute(CallingConvention::Cdecl)] 
delegate void myCallbackDelegate(void * usr_data);