On Friday, 16 June 2017 at 22:17:07 UTC, Andre Pany wrote:
int dgRef = cast(int) &(dg);
What is the type of dg there? This looks horribly, horribly wrong
to me.
If it is type delegate, you took the address of a local variable,
which is likely overwritten by the time the callback triggers.
Moreover, even if you didn't get a pointer to local, a delegate
is twice the size of a pointer and thus wouldn't fit in an int
anyway...
If it is a direct function reference it might work, though then
you might as well just use it directly as the callback.
if (auto dg = *cast(NotifyEvent*)cast(void*) reference1)
This suggests you got a pointer to the pointer; an escaped
reference to a local variable.
If the function is called immediately, the local is still in
scope and valid, but if called later, the local goes away and
gets overwritten, causing the dll thread to jump into nonsense
and most likely crash and die.
What you want to use is a regular function with a global thing,
an object reference kept alive, or a thunk.
Here's one fairly simple technique you can use:
https://stackoverflow.com/questions/22845175/pass-delegates-to-external-c-functions-in-d
