Question

I want to covert a void* to char* reinterpret_cast and static_cast, which one is fit for ?static_cast<char*> or reinterpret_cast<char*>

Answer 1

It’s largely a question of style. static_cast can do any conversion
which is the opposite of an implicit conversion (and which doesn’t
remove const or volatile). Since char* to void* is implicit,
static_cast would seem indicated; the usual rule is to use
static_cast in preference to reinterpret_cast whenever possible.

Given that this use is particularly dangerous, some coding guidelines
might prefer reinterpret_cast, to signal this fact.