error[E0433]: failed to resolve: use of undeclared crate or module `cstr` --> src/nethostexcel.rs:69:13

[openbytedev]

error[E0433]: failed to resolve: use of undeclared crate or module `cstr` --> src/nethostexcel.rs:69:13

[OpenByteDev]

Which version are you using?

[ArunGust]

rustc 1.57.0-nightly (e30b68353 2021-09-05)
cargo 1.56.0-nightly (18751dd3f 2021-09-01)

[OpenByteDev]

And what version of netcorehost?

[ArunGust]

netcorehost = "^0.3.1"

[ArunGust]

netcorehost = "^0.3.1"
path-absolutize = "3.0.10"
wchar = "0.10.1"

[OpenByteDev]

The bug should be fixed since 8978402 alongside #12. Try a version >= 0.5.0, 0.6.4 should be the best choice as its the newest.

[ArunGust]

tried 0.6.4 and 0.5.0 , below error

^^^^^^^^ expected enum c_void, found ()
|
49 | hello(_pointer, 1)
| ^^^^^^^^ expected enum c_void, found ()
|
= note: expected raw pointer *const c_void
found raw pointer *const ()

[OpenByteDev]

You probably only need to change some occurance of *const () to *const std::ffi::c_void. You can also take a look at the updated examples.

[ArunGust]

i wanted to pass data to DLL

[ArunGust]

sample code

let c_string = CString::new("pass string".to_string()).expect("CString::new failed");
let ptr = c_string.into_raw();
let _pointer = ptr as *const ();

let result = unsafe {
    hello(_pointer, 1)
};

[ArunGust]

worked after adding cstr = "0.2.8" to toml and keeping verison 0.3.0

[OpenByteDev]

You just need to replace the *const () with *const std::ffi::c_void on the third line.