在c ++中将std :: wstring转换为const*char

#include <iostream>
#include <string>
#include <Windows.h>

int main() {
    std::wstring wstr = L"Hello, 世界!";
    
    int size = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, nullptr, 0, nullptr, nullptr);
    char* buffer = new char[size];
    WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, buffer, size, nullptr, nullptr);
    
    const char* cstr = buffer;
    
    std::cout << cstr << std::endl;
    
    delete[] buffer;
    
    return 0;
}

#include <iostream>
#include <string>
#include <cstdlib>

int main() {
    std::wstring wstr = L"Hello, 世界!";
    
    size_t size = wcstombs(nullptr, wstr.c_str(), 0);
    char* buffer = new char[size + 1];
    wcstombs(buffer, wstr.c_str(), size + 1);
    
    const char* cstr = buffer;
    
    std::cout << cstr << std::endl;
    
    delete[] buffer;
    
    return 0;
}