[C++知识库]0xffffffffffffffe8 - 对struct结构体使用memset引起的core问题

memset to struct 引起的core

it = {first = <error reading variable: Cannot access memory at address 0xffffffffffffffe8>, second = {
    m_Deviceid = <error reading variable: Cannot access memory at address 0xffffffffffffffe8>, 
    m_Loopbackip = <error reading variable: Cannot access memory at address 0xffffffffffffffe8>, m_Creator = "10.27.88.149", 
    m_Createtime = "", m_editor = <error reading variable: Cannot access memory at address 0xffffffffffffffe8>, 
    m_edittime = 0, m_flag = 0}}

?string对象在创建的时候会使用构造函数初始化类成员，memset把初始化的结果全部都清除了，string就废了，所以出错。

因为，memset(&structname,0,sizeof(structname)) 会把 struct 结构体内的所有复位为0,内含的 string对象被毁坏了。所以对于struct内含需要在堆上申请内存的对象，最好不要用 memset这类函数对结构体进去初始化，如果真的需要使用，一定要注意测试周全，防止访问错误内存。

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