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How to link struct from framework? #115
Description
I'm currently attempting to call the controllers functions as seen here in order to get a list of connected controllers on mac. I'm attempting to achieve this with the following code:
use objc::{class, msg_send, sel, sel_impl};
use objc::runtime::{BOOL, Object};
fn main() {
unsafe {
let class = class!(GCController);
let selector = sel!(controllers);
let obj: *mut Object = msg_send![class, new];
let _: *mut Object = msg_send![class, selector];
// Even void methods must have their return type annotated
let _: () = msg_send![obj, release];
}
}However, it fails as follows:
thread 'main' panicked at 'Class with name GCController could not be found', src/main.rs:6:21
stack backtrace:
0: rust_begin_unwind
at /rustc/2f3ddd9f594adf9773547aa7cedb43c4ac8ffd2f/library/std/src/panicking.rs:584:5
1: core::panicking::panic_fmt
at /rustc/2f3ddd9f594adf9773547aa7cedb43c4ac8ffd2f/library/core/src/panicking.rs:142:14
2: objc_test::main
at ./src/main.rs:6:21
3: core::ops::function::FnOnce::call_once
at /rustc/2f3ddd9f594adf9773547aa7cedb43c4ac8ffd2f/library/core/src/ops/function.rs:248:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.How do I link against the Controllers framework to get this to work? Also, any advice for calling functions would be incredibly appreciated.
Activity
madsmtm commentedon Jul 16, 2022
You can link to the framework using the
linkattribute:Note that it doesn't matter what's inside the
externblock.In my fork I've documented the
msg_send!macro a bit more, especially with regards to safety requirements, that might help you a bit of the way there. Also beware that you need to follow Cocoa's memory management rules when working with objects.