如何将stringstream内容转换为char类型而不是字符串类型 [英] How to put stringstream contents into char type instead string type

问题描述

每个人都知道 stringstream.str（）需要一个字符串变量类型来存储 stringstream.str（）

Every one know stringstream.str() need a string variable type to store the content of stringstream.str() into it .

我想将 stringstream.str（）的内容存储到char变量或char数组或指针。

I want to store the content of stringstream.str() into char variable or char array or pointer.

是否可以这样做？

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推荐答案

为什么不是

std::string s = stringstream.str();
const char* p = s.c_str();

？

不能在你的函数之外自由地给出 p ：它的生命周期是绑定到 s 的生命周期，因此你可能想

Note that you cannot freely give the p outside your function: its lifetime is bound to the lifetime of s, so you may want to copy it.

编辑2：如@David建议，上面的复制意味着复制内容，而不是指针本身。有几种方法。您可以手动执行（旧方式从C继承） - 这是通过等函数完成的 std :: strcpy 。这种方式相当复杂，因为它涉及手动资源管理，通常不鼓励，因为它导致一个更复杂和容易出错的代码。或者你可以使用智能指针或容器：它可以是 std :: vector< char> 或 std :: unique_ptr / std :: shared_ptr 。

Edit 2: as @David suggests, copy above means copying of the content, not the pointer itself. There are several ways for that. You can either do it manually (legacy way "inherited" from C) -- this is done with the functions like std::strcpy. This way is quite complicated, since it involves manual resources management, which is usually discouraged, since it leads to a more complicated and error-prone code. Or you can use the smart pointers or containers: it can be either std::vector<char> or std::unique_ptr/std::shared_ptr.

我个人会选择第二种方式。看到这个和@ Oli的回答的讨论，它可以是有用的。

I personally would go for the second way. See the discussion to this and @Oli's answer, it can be useful.

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