what is the code throwing the error?
#Convert Type
rich coyote
toxic mica
Alright, so, your problem is that cpython gave you a "string" in the way they're typically represented in C: as a char*: a pointer to a null-terminated array of bytes.
Do you know how long the string is?
If so, you can convert it to a rust string (specifically, a &str), which you can print
We need an exact length for this
If you don't have it, you can compute it, but I'd be surprised if cpython doesn't have a way to get the length of a string
...Is there python code actively changing the length of the string?
If so, you cannot print it. You can't read something while someone else writes to it.
Can you guarantee that at least the length will stay constant until your GetName function returns?
Alright, that's good
rich coyote
Alright, that's good
can we use CStr::from_ptr() then do .to_str()? Haven't done much ffi
toxic mica
If you can get the length, do this:
let len = get_length_somehow
let str: &str = core::str::from_raw_parts(pointer.cast::<u8>(), len);
If you can't, you'll have to scan the string looking for a terminating 0 byte (I don't know if one exists, double check your API's docs) counting as you go. Using CStr's APIs will do this for you, so you can do that
Not that easily
But you can do your conversion in a couple more lines
...Just write the couple more lines
Put them in a helper functions if you need
No need for a macro
We're not C, you don't have to aggressively make all small functions into macros instead
Oh wait, you're right, sorry
use std::slice::from_raw_parts, then use str::from_utf8 to get a Rust string. Also, double check what encoding python strings use
That to_str method does not exist, to my knowledge
rich coyote
don't listen to me, I'm out of my depth here -- I was just suggesting something which presumably doesn't work
toxic mica
You've mixed up my suggestion and theirs
rich coyote
I've tried to replicate what you've got going on and follow the compiler errors -- can you see if this line works rust CStr::from_ptr(Result).to_str().expect("Result isn't a valid string!"); instead of rust Result.to_string();
the library you're using looks pretty awful, even for ffi. My condolances
rich coyote
this is assuming you want it as an actual rust &str, but if you want to keep it as a CStr you can leave off .to_str()