I'm trying to convert UTF-16 encoded strings to UCS-4
If I understand correctly, C++11 provides this conversion through codecvt_utf16.
My code is something like:
#include <iostream>
#include <locale>
#include <memory>
#include <codecvt>
#include <string>
using namespace std;
int main()
{
u16string s;
s.push_back('h');
s.push_back('e');
s.push_back('l');
s.push_back('l');
s.push_back('o');
wstring_convert<codecvt_utf16<wchar_t>, wchar_t> conv;
wstring ws = conv.from_bytes(reinterpret_cast<const char*> (s.c_str()));
wcout << ws << endl;
return 0;
}
Note: the explicit push_backs to get around the fact that my version of clang (Xcode 4.2) doesn't have unicode string literals.
When the code is run, I get terminate exception. Am I doing something illegal here? I was thinking it should work because the const char* that I passed to wstring_convert is UTF-16 encoded, right? I have also considered endianness being the issue, but I have checked that it's not the case.
Two errors:
1) from_bytes()
overload that takes the single const char*
expects a null-terminated byte string, but your very second byte is '\\0'.
2) your system is likely little-endian, so you need to convert from UTF-16LE to UCS-4:
#include <iostream>
#include <locale>
#include <memory>
#include <codecvt>
#include <string>
using namespace std;
int main()
{
u16string s;
s.push_back('h');
s.push_back('e');
s.push_back('l');
s.push_back('l');
s.push_back('o');
wstring_convert<codecvt_utf16<wchar_t, 0x10ffff, little_endian>,
wchar_t> conv;
wstring ws = conv.from_bytes(
reinterpret_cast<const char*> (&s[0]),
reinterpret_cast<const char*> (&s[0] + s.size()));
wcout << ws << endl;
return 0;
}
Tested with Visual Studio 2010 SP1 on Windows and CLang++/libc++-svn on Linux.
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