在 C++ 中转换代码页 [英] Converting Code pages in c++

问题描述

C# 字符串转换代码的等价物(代码页之间):

What is equivalent of the C# string conversion code (between code pages):

public static string Convert(string s)
{
    Encoding encoder = Encoding.GetEncoding(858);
    return Encoding.Default.GetString(encoder.GetBytes(s));
}

在 VC++(不是 CLR)中，例如使用 WideCharToMultiByte/MultiByteToWideChar WinAPI 函数?

in VC++ (not CLR), e.g. using WideCharToMultiByte/MultiByteToWideChar WinAPI functions?

推荐答案

是的，MultiByteToWideChar() 和 WideCharToMultiByte() 是等效的 Win32 函数，例如:

Yes, MultiByteToWideChar() and WideCharToMultiByte() are the equivalent Win32 functions, for example:

std::wstring Convert(const std::wstring &s)
{
    if (s.empty())
        return std::wstring();

    int len = WideCharToMultiByte(858, 0, s.c_str(), s.length(), NULL, 0, NULL, NULL);
    if (len == 0)
        throw std::runtime_error("WideCharToMultiByte() failed"); 

    std::vector<char> bytes(len);

    len = WideCharToMultiByte(858, 0, s.c_str(), s.length(), &bytes[0], len, NULL, NULL);
    if (len == 0)
        throw std::runtime_error("WideCharToMultiByte() failed"); 

    len = MultiByteToWideChar(CP_ACP, 0, &bytes[0], bytes.size(), NULL, 0);
    if (len == 0)
        throw std::runtime_error("MultiByteToWideChar() failed"); 

    std::wstring result;
    result.resize(len);

    len = MultiByteToWideChar(CP_ACP, 0, &bytes[0], bytes.size(), &result[0], len);
    if (len == 0)
        throw std::runtime_error("MultiByteToWideChar() failed"); 

    return result;
}

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