golang位移操作的一个小坑
妙音
posted @ 2021年11月25日 16:08
in golang
, 810 阅读
问题描述
现有int16类型的整数，将它转为两个字节存放。在还原时，一不小心会就被坑了。
错误用法
length := int(keyBytes[cursor] + keyBytes[cursor+1] <<8)
正确用法
keyBytes := []byte{ 16, 1}
length := int(uint16(keyBytes[cursor]) + uint16(keyBytes[cursor+1]) <<8)
错误原因
字节byte位移时类型不会自动变化, 先要转换类型再位移。
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