.Mac上的Net Core StringBuilder编码

我有以下C函数:

LIBRARY_API HRESULT LA_CC GetRSAKeyPair(STRTYPE privateKeyPtr, STRTYPE publicKeyPtr)
{
    int length = 2048;
    string privateKey, publicKey;
    if (GenerateRSAKeyPair(privateKey, publicKey) == false)
    {
        return FAIL;
    }
#ifndef _WIN32
        *privateKeyPtr = '\0'; // assumes `dest_size > 0`
        strncat(privateKeyPtr, privateKey.c_str(), length);
        *publicKeyPtr = '\0'; // assumes `dest_size > 0`
        strncat(publicKeyPtr, publicKey.c_str(), length);
#else
        *privateKeyPtr = L'\0'; // assumes `dest_size > 0`
        wcsncat(privateKeyPtr, toUTF16(privateKey).c_str(), length);
        *publicKeyPtr = L'\0'; // assumes `dest_size > 0`
        wcsncat(publicKeyPtr, toUTF16(publicKey).c_str(), length);
#endif
    return OK;
}

使用pinvoke调用:

[DllImport(DLL_FILE_NAME, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
 public static extern int GetRSAKeyPair(StringBuilder privateKey, StringBuilder publicKey);

使用时:

StringBuilder privateKey = new StringBuilder(2048);
StringBuilder publicKey = new StringBuilder(2048);
LibraryNative.GetRSAKeyPair(privateKey, publicKey);
Console.WriteLine(privateKey);
Console.WriteLine(publicKey);

输出以中文返回数据,尽管相同的代码在Windows上运行良好。本机库假设编码在非windows平台上不是utf-16,但stringbuilder似乎也期望在nix上使用utf-16。