在这个帖子找到的代码 还蛮好用的 https://bbs.csdn.net/topics/391040755
#include <codecvt> #include <locale> #include <vector> using namespace std; std::string gb2312_to_utf8(std::string const &strGb2312) { std::vector<wchar_t> buff(strGb2312.size()); #ifdef _MSC_VER std::locale loc("zh-CN"); #else std::locale loc("zh_CN.GB18030"); #endif wchar_t* pwszNext = nullptr; const char* pszNext = nullptr; mbstate_t state = {}; int res = std::use_facet<std::codecvt<wchar_t, char, mbstate_t> > (loc).in(state, strGb2312.data(), strGb2312.data() + strGb2312.size(), pszNext, buff.data(), buff.data() + buff.size(), pwszNext); if (std::codecvt_base::ok == res) { std::wstring_convert<std::codecvt_utf8<wchar_t>> cutf8; return cutf8.to_bytes(std::wstring(buff.data(), pwszNext)); } return ""; } std::string utf8_to_gb2312(std::string const &strUtf8) { std::wstring_convert<std::codecvt_utf8<wchar_t>> cutf8; std::wstring wTemp = cutf8.from_bytes(strUtf8); #ifdef _MSC_VER std::locale loc("zh-CN"); #else std::locale loc("zh_CN.GB18030"); #endif const wchar_t* pwszNext = nullptr; char* pszNext = nullptr; mbstate_t state = {}; std::vector<char> buff(wTemp.size() * 2); int res = std::use_facet<std::codecvt<wchar_t, char, mbstate_t> > (loc).out(state, wTemp.data(), wTemp.data() + wTemp.size(), pwszNext, buff.data(), buff.data() + buff.size(), pszNext); if (std::codecvt_base::ok == res) { return std::string(buff.data(), pszNext); } return ""; }