Crate apple_objc_sys 

Minimal ObjC runtime FFI for Apple framework crates.

Provides the raw ObjC runtime symbols (objc_msgSend, objc_getClass, sel_registerName) plus ergonomic helper macros so framework crates can call ObjC methods directly from Rust — no .m files, no cc build step.

Example

use apple_objc_sys::*;

unsafe {
    let cls = class!(b"NSProcessInfo");
    let info: Id = msg_send![cls, processInfo];
    let count: isize = msg_send![info, processorCount];
}

License

GPL-3.0 — Copyright © 2025 Eugene Hauptmann

Macros

class

Look up an ObjC class by name (null-terminated byte string).

msg_send

Send an ObjC message. Returns Id by default.

msg_send_t

Send an ObjC message that returns a typed non-Id value (bool, isize, f64, etc.).

msg_send_void

Void-returning ObjC message send.

sel

Register / look up an ObjC selector (null-terminated byte string).

Constants

K_CF_ALLOCATOR_DEFAULT

K_CF_STRING_ENCODING_UTF8

NIL

NULL object.

Statics

kCFBooleanFalse^⚠

kCFBooleanTrue^⚠

kCFTypeDictionaryKeyCallBacks^⚠

kCFTypeDictionaryValueCallBacks^⚠

Functions

CFDataCreate^⚠

CFDataGetBytePtr^⚠

CFDataGetLength^⚠

CFDictionaryCreate^⚠

CFRelease^⚠

CFRetain^⚠

CFStringCreateWithBytes^⚠

CFStringGetCString^⚠

CFStringGetCStringPtr^⚠

CFStringGetLength^⚠

cfdict^⚠

Build a CFDictionaryRef from parallel key/value slices.

dlsym_global^⚠

Look up a global symbol by name via dlsym(RTLD_DEFAULT, name).

global_string_const^⚠

Read a global NSString* / CFStringRef constant by symbol name. Many Apple framework constants (e.g. kSecClass) are pointers to CFStringRef — this dereferences the pointer.

nsstring^⚠

Create an autoreleased NSString from a Rust &str.

nsstring_to_buf^⚠

Write an NSString* into a (buf, len) pair, returning bytes written or -1.

nsstring_to_string^⚠

Read an NSString* (toll-free bridged CFStringRef) into a Rust String.

objc_getClass^⚠

objc_msgSend^⚠

objc_msgSend_stret^⚠

objc_msgSend variant for stret on x86_64 (structs > 16 bytes).

sel_registerName^⚠

Type Aliases

CFAllocatorRef

CFDataRef

CFDictionaryRef

CFIndex

CFStringRef

CFTypeRef

Class

Opaque ObjC class pointer.

Id

Opaque ObjC object pointer.

Sel

Opaque ObjC selector pointer.