How to convert wstring into string?
c++, stl, unicode, wstring
Solution
Here is a worked-out solution based on the other suggestions:
#include <string>
#include <iostream>
#include <clocale>
#include <locale>
#include <vector>
int main() {
std::setlocale(LC_ALL, "");
const std::wstring ws = L"ħëłlö";
const std::locale locale("");
typedef std::codecvt<wchar_t, char, std::mbstate_t> converter_type;
const converter_type& converter = std::use_facet<converter_type>(locale);
std::vector<char> to(ws.length() * converter.max_length());
std::mbstate_t state;
const wchar_t* from_next;
char* to_next;
const converter_type::result result = converter.out(state, ws.data(), ws.data() + ws.length(), from_next, &to[0], &to[0] + to.size(), to_next);
if (result == converter_type::ok or result == converter_type::noconv) {
const std::string s(&to[0], to_next);
std::cout <<"std::string = "<<s<<std::endl;
}
}
This will usually work for Linux, but will create problems on Windows.
Problem
The question is how to convert wstring to string? I have next example : ``` #include <string> #include <iostream> int main() { std::wstring ws = L"Hello"; std::string s( ws.begin(), ws.end() ); //std::cout <<"std::string = "<<s<<std::endl; std::wcout<<"std::wstring = "<<ws<<std::endl; std::cout <<"std::string = "<<s<<std::endl; } ``` the output with commented out line is : ``` std::string = Hello std::wstring = Hello std::string = Hello ``` but without is only : ``` std::wstring = Hello ``` Is anything wrong in the example? Can I do the conversion like above? EDIT New example (taking into account some answers) is ``` #include <string> #include <iostream> #include <sstream> #include <locale> int main() { setlocale(LC_CTYPE, ""); const std::wstring ws = L"Hello"; const std::string s( ws.begin(), ws.end() ); std::cout<<"std::string = "<<s<<std::endl; std::wcout<<"std::wstring = "<<ws<<std::endl; std::stringstream ss; ss << ws.c_str(); std::cout<<"std::stringstream = "<<ss.str()<<std::endl; } ``` The output is : ``` std::string = Hello std::wstring = Hello std::stringstream = 0x860283c ``` therefore the stringstream can not be used to convert wstring into string.