error C2440: '=': cannot convert from 'char *' to 'PCZZWSTR'

方法一：

字符集转换： utf8 to uni.

std::wstring utf8_to_uni(const char *in)
{
    return _to_uni(CP_UTF8, in);   // ansi to uni: CP_ACP
}

std::wstring _to_uni(unsigned int acp, const char *lpa)
{
    int nChars = strlen(lpa)+1;
    wchar_t *lpw = new wchar_t[nChars];
    lpw[0] = 0;

    int ret = MultiByteToWideChar(acp, 0, lpa, -1, lpw, nChars);
    if(ret == 0)
    {
        delete []lpw;
        return L"";
    }

    std::wstring wstrlpw = lpw;
    delete []lpw;
    return wstrlpw;
}

方法二：

打开工程属性面板："General" -> "Character Set"  设置为："Use Multi-Byte Character Set" 。