Guys. I Wana cast a lparam to some structure in

Question

Guys. I Wana cast a lparam to some structure in

my code.(on windows)

And after that, access members of that struct and do some calculations.

Simetines this cast results to null. And if I access those members of struct, I'll get a segfault.

How ensure about validity of these kinds of casts?

0

28.11.2020

6 ответов

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Пользователь 61653 Автор вопроса

Parra
check against null before accessing it

I checked it. It's always not null but dereftencing it willy cause segfault.

0

28.11.2020

Parra

Пользователь 61653
I checked it. It's always not null but dereftencin...

maybe it's a read after free

0

28.11.2020

Пользователь 61653 Автор вопроса

Parra
maybe it's a read after free

Sorry?

0

28.11.2020

Parra

Пользователь 61653
Sorry?

https://stackoverflow.com/questions/42588482/c-accessing-data-after-memory-has-been-freeed

0

28.11.2020

Parra

Пользователь 61653
Sorry?

https://en.m.wikipedia.org/wiki/Dangling_pointer

0

28.11.2020

Parra · Accepted Answer

Parra

check against null before accessing it

0

28.11.2020

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