Unicode 转 UTF-8

char* UnicodeToUtf8(const wchar_t* unicode)
{
    int len;
    len = WideCharToMultiByte(CP_UTF8, 0, unicode, -1, NULL, 0, NULL, NULL);
    char *szUtf8 = (char*)malloc(len + 1);
    memset(szUtf8, 0, len + 1);
    WideCharToMultiByte(CP_UTF8, 0, unicode, -1, szUtf8, len, NULL, NULL);
    return szUtf8;
}

int main(int argc, char *argv[])
{
    wchar_t* wCharUnicode = L"中国";
    char* cCharUtf = UnicodeToUtf8(wCharUnicode);

    return 0;
}