[c++]u16Stringからstd::ifstream を作る
エンディアンで変わるのでお気をつけて
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#include <istream> #include <uchar.h> #include <codecvt> #include <string> std::wstring& convertU16StringToWstring(std::wstring& ws, std::u16string& u16Str) { bool bigEndian; using namespace std; union { uint32_t b4; /* 4byte */ uint8_t b1[4]; /* 1byte×4 */ } bytes; bytes.b4 = 0x12345678; bigEndian = bytes.b1[0] == 12 ? true : false; std::u16string utf16Str = u16Str; std::wstring_convert<codecvt_utf8<uint16_t>, uint16_t> utf8Conv; if (bigEndian) { wstring_convert<codecvt_utf16<wchar_t, 0x10ffff>, wchar_t> conv; ws = conv.from_bytes( reinterpret_cast<const char*> (&utf16Str[0]), reinterpret_cast<const char*> (&utf16Str[0] + utf16Str.size())); } else { wstring_convert<codecvt_utf16<wchar_t, 0x10ffff, little_endian>, wchar_t> conv; ws = conv.from_bytes( reinterpret_cast<const char*> (&utf16Str[0]), reinterpret_cast<const char*> (&utf16Str[0] + utf16Str.size())); } return ws; } std::ifstream fin; fin.open(ws, ios::binary); |
