存在 runtime.SetFinalizer 函数，但不能在C代码分配的任何对象上使用.

There exists the runtime.SetFinalizer function, but it cannot be used on any object allocated by C code.

但是，您可以为每个需要自动释放的C对象创建一个Go对象:

However, you can create a Go object for each C object that needs to be freed automatically:

type Stuff struct {
    cStuff *C.Stuff
}

func NewStuff() *Stuff {
    s := &Stuff{C.NewStuff()}
    runtime.SetFinalizer(s, (*Stuff).Free)
    return s
}

func (s *Stuff) Free() {
    C.Free(s.cStuff)
}