Cannot access all event attributes via sfRenderWindow_pollEvent

[efrizoid]

sfRenderWindow_pollEvent function works only with sfEvent type. How can I access event attributes other than event type (like mouse position or pressed key code) when using this function? These attributes are declared in other types like e.g. sfMouseButtonEvent and it looks to me that these are not accessible via sfRenderWindow_pollEvent function.

If I understand correctly, in CSFML sfEvent type should be union of more concrete event types like sfKeyEvent.

[Gnimuc]

Since there is no one-to-one correspondence between Julia struct and C union, you need to use pointer arithmetic or some packages like Blobs.jl.

[Gnimuc]

reinterpret might also work.

[efrizoid]

Ok, thanks for the tips. I'm still wondering though... When julia creates sfEvent object it only allocates memory for the type attribute and C function gets only a pointer to that object. It then seems that C function could write to memory which does not belong to that sfEvent object when trying to manipulate other attributes which sfEvent union is assumed to have. Couldn't this lead to memory corruption or segfaults?

[Gnimuc]

Good question. I guess this might due to an old bug in Clang.jl, now it generates:

struct sfEvent
    key::sfKeyEvent
end

which is the largest field in the union. However, it is quite annoying for end-users when querying data from such a union. I'm going to overload getproperty to mimic the C union behavior, so users don't need to do pointer arithmetics.

[Gnimuc]

Hi @EimantasLedinauskas, it should work now, you could give the example in the master branch a try. BTW, would you like me to tag a new release for this change?

My current plan is to wait CEnum.jl's overhaul which will break everything that depends on it and then I'll regenerate the whole C bindings using Clang.jl. But if you're urgent, I'll tag the new release tomorrow.

[efrizoid]

Nice, thanks! It's not urgent, I can wait for the planned release :)