如何使用标准C ++从UTF-8转换为ANSI [英] How to convert from UTF-8 to ANSI using standard c++

问题描述

我从数据库中读取了一些字符串，它们以char *和UTF-8格式存储（您知道，á的编码为0xC3 0xA1）。但是，为了将它们写到文件中，我首先需要将它们转换为ANSI（无法将文件制成UTF-8格式...它只能读为ANSI），因此我的á不会成为一个。是的，我知道某些数据会丢失（中文字符，并且一般而言，ANSI代码页中没有的任何内容），但这正是我所需要的。

I have some strings read from the database, stored in a char* and in UTF-8 format (you know, "á" is encoded as 0xC3 0xA1). But, in order to write them to a file, I first need to convert them to ANSI (can't make the file in UTF-8 format... it's only read as ANSI), so that my "á" doesn't become "á". Yes, I know some data will be lost (chinese characters, and in general anything not in the ANSI code page) but that's exactly what I need.

但是问题是，我需要在各种平台上进行编译的代码，因此它必须是标准的C ++（即没有Winapi，只有stdlib，stl，crt或任何具有可用源代码的自定义库）。

But the thing is, I need the code to compile in various platforms, so it has to be standard C++ (i.e. no Winapi, only stdlib, stl, crt or any custom library with available source).

有人有什么建议吗？

推荐答案

几天前，有人回答说，如果我有C ++ 11编译器，我可以尝试这样做：

A few days ago, somebody answered that if I had a C++11 compiler, I could try this:

#include <string>
#include <codecvt>
#include <locale>

string utf8_to_string(const char *utf8str, const locale& loc)
{
    // UTF-8 to wstring
    wstring_convert<codecvt_utf8<wchar_t>> wconv;
    wstring wstr = wconv.from_bytes(utf8str);
    // wstring to string
    vector<char> buf(wstr.size());
    use_facet<ctype<wchar_t>>(loc).narrow(wstr.data(), wstr.data() + wstr.size(), '?', buf.data());
    return string(buf.data(), buf.size());
}

int main(int argc, char* argv[])
{
    string ansi;
    char utf8txt[] = {0xc3, 0xa1, 0};

    // I guess you want to use Windows-1252 encoding...
    ansi = utf8_to_string(utf8txt, locale(".1252"));
    // Now do something with the string
    return 0;
}

不知道响应发生了什么，显然有人删除了它。但是，事实证明，这是完美的解决方案。对于张贴的任何人，非常感谢，您值得AC和支持！！！

Don't know what happened to the response, apparently someone deleted it. But, turns out that it is the perfect solution. To whoever posted, thanks a lot, and you deserve the AC and upvote!!

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