如何读取包含vc ++中的\uxxxx的文件 [英] How to read file which contains \uxxxx in vc++
问题描述
我有txt档案,其内容是:
I have txt file whose contents are:
\\\П\\\е\\\р\\\в\\\ы\ u0439_\\\и\\\н\\\т\\\е\\\р\\\а\\\к\\\т\\\и\\\в\\\н\\\ы\\\й_\\\и\\\н\\\т\\ \\ u0435\\\р\\\н\\\е\\\т_\\\к\\\а\\\н\\\а\\\л
\u041f\u0435\u0440\u0432\u044b\u0439_\u0438\u043d\u0442\u0435\u0440\u0430\u043a\u0442\u0438\u0432\u043d\u044b\u0439_\u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442_\u043a\u0430\u043d\u0430\u043b
如何读取此类文件以获得如下结果:
How can I read such file to get result like this:
Первый_интерактивный_интернет_канал
"Первый_интерактивный_интернет_канал"
如果我输入:
string str = _T("\u041f\u0435\u0440\u0432\u044b\u0439_\u0438\u043d\u0442\u0435\u0440\u0430\u043a\u0442\u0438\u0432\u043d\u044b\u0439_\u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442_\u043a\u0430\u043d\u0430\u043b");
然后导致 str
我从文件中读取它,它是相同的,在文件中。我想这是因为'\u'变成'\u'。
是否有简单的方法将\uxxxx表示法转换为C ++中的相应符号?
then result in str
is good but if I read it from file then it is the same like in file. I guess it is because '\u' becomes '\u'.
Is there simple way to convert \uxxxx notation to corresponding symbols in C++?
推荐答案
MSalters的建议:
Here is an example for MSalters's suggestion:
#include <iostream>
#include <string>
#include <fstream>
#include <algorithm>
#include <sstream>
#include <iomanip>
#include <locale>
#include <boost/scoped_array.hpp>
#include <boost/regex.hpp>
#include <boost/numeric/conversion/cast.hpp>
std::wstring convert_unicode_escape_sequences(const std::string& source) {
const boost::regex regex("\\\\u([0-9A-Fa-f]{4})"); // NB: no support for non-BMP characters
boost::scoped_array<wchar_t> buffer(new wchar_t[source.size()]);
wchar_t* const output_begin = buffer.get();
wchar_t* output_iter = output_begin;
std::string::const_iterator last_match = source.begin();
for (boost::sregex_iterator input_iter(source.begin(), source.end(), regex), input_end; input_iter != input_end; ++input_iter) {
const boost::smatch& match = *input_iter;
output_iter = std::copy(match.prefix().first, match.prefix().second, output_iter);
std::stringstream stream;
stream << std::hex << match[1].str() << std::ends;
unsigned int value;
stream >> value;
*output_iter++ = boost::numeric_cast<wchar_t>(value);
last_match = match[0].second;
}
output_iter = std::copy(last_match, source.end(), output_iter);
return std::wstring(output_begin, output_iter);
}
int wmain() {
std::locale::global(std::locale(""));
const std::wstring filename = L"test.txt";
std::ifstream stream(filename.c_str(), std::ios::in | std::ios::binary);
stream.seekg(0, std::ios::end);
const std::ifstream::streampos size = stream.tellg();
stream.seekg(0);
boost::scoped_array<char> buffer(new char[size]);
stream.read(buffer.get(), size);
const std::string source(buffer.get(), size);
const std::wstring result = convert_unicode_escape_sequences(source);
std::wcout << result << std::endl;
}
我总是感到惊讶的是,看起来像这样简单的东西在C ++中有多么复杂。
I'm always surprised how complicated seemingly simple things like this are in C++.
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