UTF8与std:string互转

　　Ajax请求发送的UTF8编码字符串传到后台使用std:string进一步处理，如果包含中文会出现中文乱码的问题：

　　特找了一下转码的解决方法，直接代码如下：

 C++ Code 

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// UTF8转std:string
// 转换过程：先将utf8转双字节Unicode编码，再通过WideCharToMultiByte将宽字符转换为多字节。
std::string UTF8_To_string(const std::string& str)
{
    int nwLen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0);
    wchar_t* pwBuf = new wchar_t[nwLen + 1];    //一定要加1，不然会出现尾巴
    memset(pwBuf, 0, nwLen * 2 + 2);
    MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), pwBuf, nwLen);
    int nLen = WideCharToMultiByte(CP_ACP, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
    char* pBuf = new char[nLen + 1];
    memset(pBuf, 0, nLen + 1);
    WideCharToMultiByte(CP_ACP, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);

    std::string strRet = pBuf;

    delete []pBuf;
    delete []pwBuf;
    pBuf = NULL;
    pwBuf = NULL;

    return strRet;
}

// std:string转UTF8
std::string string_To_UTF8(const std::string& str)
{
    int nwLen = ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0);
    wchar_t* pwBuf = new wchar_t[nwLen + 1];    //一定要加1，不然会出现尾巴
    ZeroMemory(pwBuf, nwLen * 2 + 2);
    ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen);
    int nLen = ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
    char* pBuf = new char[nLen + 1];
    ZeroMemory(pBuf, nLen + 1);
    ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);

    std::string strRet(pBuf);

    delete []pwBuf;
    delete []pBuf;
    pwBuf = NULL;
    pBuf  = NULL;

    return strRet;
}

问题解决bingo！