Function sc_shareable_content_get_sync 

pub unsafe extern "C" fn sc_shareable_content_get_sync(
    exclude_desktop_windows: bool,
    on_screen_windows_only: bool,
    error_buffer: *mut i8,
    error_buffer_size: isize,
) -> *const c_void

Synchronous blocking call to get shareable content.

Returns the content pointer on success, or writes an error message (NUL-terminated UTF-8) into error_buffer.

Safety

error_buffer must point to at least error_buffer_size writable bytes. The Swift bridge writes at most error_buffer_size - 1 payload bytes plus a NUL terminator (i.e. it respects the size argument and never writes past the buffer). error_buffer_size is isize for ABI compatibility with Apple’s pattern, but values must be > 0; pass crate::utils::ffi_string::DEFAULT_BUFFER_SIZE (1024) or SMALL_BUFFER_SIZE (256) cast to isize for typical error messages.