In the NXT Communication Protocol document, IO-Maps are described as "the well-described layer between the different controllers/drivers stack and the VM running the user's code." That sounds potentially interesting if it allows access to drivers in ways which aren't normally allowed. Also, if this is an interface which isn't normally used, it is a potential location for unexpected and exploitable bugs.
except (ValueError, OverflowError):
，详情可参考搜狗输入法
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A surface can now be marked "readonly" and it will no longer send any。关于这个话题，博客提供了深入分析