exp/cpp/export/export.go
func FrameSet_Frame(id FrameSetId, index int) (C.int, Error) {
	fs, ok := sFrameSets.Get(id)
	if !ok {
		return 0, C.CString("FrameSet was deleted")
	}
	frame, err := fs.Frame(index)
	if err != nil {
		return 0, C.CString(err.Error())
	}

	// err string is freed by caller
	return C.int(frame), nil
}
func FrameSet_Frame(id FrameSetId, index int) (C.int, Error) {
	fs, ok := sFrameSets.Get(id)
	if !ok {
		return 0, C.CString("FrameSet was deleted")
	}
	frame, err := fs.Frame(index)
	if err != nil {
		return 0, C.CString(err.Error())
	}

	// err string is freed by caller
	return C.int(frame), nil
}
//export FrameSet_Frame