C++ 将 std::string 转换为 std::vector<char>
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Converting std::string to std::vector<char>
提问by Homunculus Reticulli
I am using a library which accepts data as a vectorof chars. I need to pass a stringto the library.
我使用的接收数据作为图书馆vector的char秒。我需要将 a 传递string给图书馆。
I think about using std::vectorconstructor which accepts iterators to carry out the conversion - but wondered if there is a better way of doing it?
我考虑使用std::vector接受迭代器的构造函数来执行转换 - 但想知道是否有更好的方法来做到这一点？
/*Note: json_str is of type std::string*/
const std::vector<char> charvect(json_str.begin(), json_str.end());
采纳答案by Xeo
Nope, that's the way to do it, directly initializing the vector with the data from the string.
不，这就是这样做的方法，直接用字符串中的数据初始化向量。
As @ildjarn points out in his comment, if for whatever reason your data buffer needs to be null-terminated, you need to explicitly add it with charvect.push_back('\0').
正如@ildjarn 在他的评论中指出的那样，如果由于某种原因您的数据缓冲区需要以空值结尾，您需要显式地添加charvect.push_back('\0').
Also note, if you want to reuse the buffer, use the assignmember function which takes iterators.
另请注意，如果您想重用缓冲区，请使用assign带有迭代器的成员函数。
回答by John Dibling
Your method of populating the vectoris fine -- in fact, it's probably best in most cases.
您填充 的vector方法很好 - 事实上，在大多数情况下它可能是最好的。
Just so that you know however, it's not the only way. You could also simply copy the contents of the stringin to the vector<char>. This is going to be most useful when you either have a vectoralready instantiated, or if you want to append more data to the end -- or at any point, really.
只是为了让您知道，这不是唯一的方法。您也可以简单地将stringin的内容复制到vector<char>. 当您vector已经实例化了一个，或者您想在末尾附加更多数据时，这将是最有用的 - 或者在任何时候，真的。
Example, where sis a std::stringand vis a std::vector<char>:
示例，其中s是 astd::string和v是 a std::vector<char>：
std::copy( s.begin(), s.end(), std::back_inserter(v));
As with the constructor case, if you need a null-terminator then you'll need to push that back yourself:
与构造函数的情况一样，如果您需要一个空终止符，那么您需要自己将其推回：
v.push_back('##代码##');
