C++ 处理字符串编码问题
#include <iostream>
#include <locale>
#include <codecvt>
std::string UnicodeToUTF8(const std::wstring &wstr) {
std::string ret;
try {
std::wstring_convert<std::codecvt_utf8<wchar_t> > wcv;
ret = wcv.to_bytes(wstr);
} catch (const std::exception &e) {
std::cerr << e.what() << std::endl;
}
return ret;
}
std::wstring UTF8ToUnicode(const std::string &str) {
std::wstring ret;
try {
std::wstring_convert<std::codecvt_utf8<wchar_t> > wcv;
ret = wcv.from_bytes(str);
} catch (const std::exception &e) {
std::cerr << e.what() << std::endl;
}
return ret;
}
std::string UnicodeToANSI(const std::wstring &wstr) {
std::string ret;
std::mbstate_t state = {};
const wchar_t *src = wstr.data();
size_t len = std::wcsrtombs(nullptr, &src, 0, &state);
if (static_cast<size_t>(-1) != len) {
std::unique_ptr<char[]> buff(new char[len + 1]);
len = std::wcsrtombs(buff.get(), &src, len, &state);
if (static_cast<size_t>(-1) != len) {
ret.assign(buff.get(), len);
}
}
return ret;
}
std::wstring ANSIToUnicode(const std::string &str) {
std::wstring ret;
std::mbstate_t state = {};
const char *src = str.data();
size_t len = std::mbsrtowcs(nullptr, &src, 0, &state);
if (static_cast<size_t>(-1) != len) {
std::unique_ptr<wchar_t[]> buff(new wchar_t[len + 1]);
len = std::mbsrtowcs(buff.get(), &src, len, &state);
if (static_cast<size_t>(-1) != len) {
ret.assign(buff.get(), len);
}
}
return ret;
}
std::string UTF8ToANSI(const std::string &str) {
return UnicodeToANSI(UTF8ToUnicode(str));
}
std::string ANSIToUTF8(const std::string &str) {
return UnicodeToUTF8(ANSIToUnicode(str));
}
int main(int argc, char *argv[]) {
// Unicode => UTF8
std::wstring aa = L"你好！";
std::string bb = UnicodeToUTF8(aa);
std::cout << bb << std::endl;
// UTF-8 => ANSI
return 0;
}
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