c ++将time_t转换为字符串并再次返回 [英] c++ convert time_t to string and back again

问题描述

我想将 time_t 转换为字符串并再次返回.
我想使用 ctime() 将时间转换为字符串.
我似乎在 google 或 time.h 头文件上找不到任何东西，有什么想法吗?
基本上我想做的是将日期存储在文件中，然后将其读回，以便我可以再次将其用作 time_t.
此外，没有 std、mfc 之外的库引用.
还要注意的是，这必须在 Windows xp 及更高版本上运行，仅此而已.

I want to convert a time_t to a string and back again.
I'd like to convert the time to a string using ctime().
I can't seem to find anything on google or the time.h header file, any ideas?
Basically what I'm trying to do is store a date in a file, and then read it back so I can use it as a time_t again.
Also, no library references outside of std,mfc.
One more note, this will have to function on Windows xp and above and that's it.

我想要做的就是将 time_t 转换为字符串(我不在乎它是否是人类可读的)，然后将其转换回 time_t.我基本上只是试图将 time_t 存储到一个文件中并再次读取它(但我不想要任何代码，因为除了 time_t 之外，文件中还会有更多信息).

All I want to do is convert a time_t into a string(I don't care if it's human readable) and then convert it back to a time_t. I'm basically just trying to store the time_t into a file and read it again(but I don't want any code for that, as there will be more info in the file besides a time_t).

推荐答案

您必须编写自己的函数才能做到这一点.这些函数将任何原始类型(或任何重载 operator<<和/或 operator>> 的类型)转换为字符串，反之亦然:

You'll have to write your own function to do that. These functions convert any primitive type (or any type which overloads operator<< and/or operator>>) to a string, and viceversa:

template<typename T>
std::string StringUtils::toString(const T &t) {
    std::ostringstream oss;
    oss << t;
    return oss.str();
}

template<typename T>
T StringUtils::fromString( const std::string& s ) {
    std::istringstream stream( s );
    T t;
    stream >> t;
    return t;
}

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