void* pointers get corrupted: D bug or misunderstanding?

[Adam D. Ruppe]

On Sunday, 28 July 2019 at 18:37:26 UTC, Dennis wrote:
> Can you give your exact callback function definition?

Yes, indeed. D's `long` and C's `long` are incompatible too, so 
using the wrong there is a potential for this kind of problem as 
well (the argument before the pointer is the wrong size, so then 
the pointer value is pulled from the wrong location).