如何在 C++ 中从字符串流转换为字符串？
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How do I convert from stringstream to string in C++?
提问by Nick Bolton
How do I convert from std::stringstreamto std::stringin C++?
我如何在 C++ 中转换std::stringstream为std::string？
Do I need to call a method on the string stream?
我需要在字符串流上调用一个方法吗？
回答by Tyler McHenry
???????
???????
yourStringStream.str()
回答by Emil H
Use the .str()-method:
使用.str() 方法：
Manages the contents of the underlying string object.
1) Returns a copy of the underlying string as if by calling
rdbuf()->str().2) Replaces the contents of the underlying string as if by calling
rdbuf()->str(new_str)...Notes
The copy of the underlying string returned by str is a temporary object that will be destructed at the end of the expression, so directly calling
c_str()on the result ofstr()(for example inauto *ptr = out.str().c_str();) results in a dangling pointer...
管理基础字符串对象的内容。
1) 返回底层字符串的副本，就像调用
rdbuf()->str().2) 替换底层字符串的内容，就像通过调用
rdbuf()->str(new_str)...笔记
由STR返回的基础字符串的副本，将在表达式的结尾被破坏，所以直接调用临时对象
c_str()上的结果str()（例如，在auto *ptr = out.str().c_str();以悬空指针）结果...
回答by hkBattousai
std::stringstream::str()is the method you are looking for.
std::stringstream::str()是您正在寻找的方法。
With std::stringstream:
与std::stringstream：
template <class T>
std::string YourClass::NumericToString(const T & NumericValue)
{
std::stringstream ss;
ss << NumericValue;
return ss.str();
}
std::stringstreamis a more generic tool. You can use the more specialized class std::ostringstreamfor this specific job.
std::stringstream是一个更通用的工具。您可以std::ostringstream针对此特定作业使用更专业的类。
template <class T>
std::string YourClass::NumericToString(const T & NumericValue)
{
std::ostringstream oss;
oss << NumericValue;
return oss.str();
}
If you are working with std::wstringtype of strings, you must prefer std::wstringstreamor std::wostringstreaminstead.
如果您正在使用std::wstring字符串类型，则必须更喜欢std::wstringstream或std::wostringstream代替。
template <class T>
std::wstring YourClass::NumericToString(const T & NumericValue)
{
std::wostringstream woss;
woss << NumericValue;
return woss.str();
}
if you want the character type of your string could be run-time selectable, you should also make it a template variable.
如果您希望字符串的字符类型可以在运行时选择，您还应该将其设为模板变量。
template <class CharType, class NumType>
std::basic_string<CharType> YourClass::NumericToString(const NumType & NumericValue)
{
std::basic_ostringstream<CharType> oss;
oss << NumericValue;
return oss.str();
}
For all the methods above, you must include the following two header files.
对于上述所有方法，您必须包含以下两个头文件。
#include <string>
#include <sstream>
Note that, the argument NumericValuein the examples above can also be passed as std::stringor std::wstringto be used with the std::ostringstreamand std::wostringstreaminstances respectively. It is not necessary for the NumericValueto be a numeric value.
请注意，NumericValue上述示例中的参数也可以分别作为和实例传递std::string或std::wstring与std::ostringstream和std::wostringstream实例一起使用。不必NumericValue是数值。
回答by Timo Geusch
From memory, you call stringstream::str()to get the std::stringvalue out.
从内存中，您调用stringstream::str()以获取std::string值。
