从本机代码返回托管状态会损坏返回的对象

我正在尝试使用C ++ / CLI和yubico的libu2f-host（https://github.com/Yubico/libu2f-host）在WPF程序中为U2F身份验证构建实现我在C ++ / CLI中具有完全本机的功能dll会调用相应的libu2f函数，然后返回指向u2f_reply（我自己的类）的指针，该指针包含响应和错误代码。但是，当dll的托管部分接收到此对象时，响应代码仍然正确，但响应字符串似乎已完全损坏。

我尝试立即返回char指针，然后使用marshal将其转换为托管字符串，并且尝试使用标准C＃字符串。我尝试使用memcpy将响应复制到reply-> response中，但是没有运气。

Managed_U2F_Reply^ Utilities::AuthenticateU2F(System::String^ challenge)
{
    IntPtr ptrToChallenge = System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(challenge);
    u2f_reply* reply = NativeUtilities::AuthenticateU2F(static_cast<char*>(ptrToChallenge.ToPointer()));
    //clean up before return
    System::Runtime::InteropServices::Marshal::FreeHGlobal(ptrToChallenge);
    Managed_U2F_Reply^ managedReply = gcnew Managed_U2F_Reply();
    managedReply->ResultCode = reply->responseCode;
    if (managedReply->ResultCode == 0)
    {
        managedReply->Response = gcnew String(reply->response, 0, reply->length);
    }
    return managedReply;
}

struct u2f_reply
{
    int responseCode;
    int length;
    char* response;
};

u2f_reply* NativeUtilities::AuthenticateU2F(char* challenge)
{
    u2f_reply* reply = new u2f_reply();
    char response[2048] = { 0 };
    size_t response_len = sizeof(response);
    u2fh_devs* devs = NULL;
    u2fh_rc rc;
    u2fh_initflags flags = (u2fh_initflags)0;
    rc = u2fh_global_init(flags);
    if (rc != U2FH_OK)
    {
        reply->responseCode = rc;
        return reply;
    }
    rc = u2fh_devs_init(&devs);
    if (rc != U2FH_OK)
    {
        reply->responseCode = rc;
        return reply;
    }
    rc = u2fh_devs_discover(devs, NULL);
    if (rc != U2FH_OK)
    {
        reply->responseCode = rc;
        return reply;
    }
    rc = u2fh_authenticate2(devs, challenge, "https://demo.yubico.com", response, &response_len, U2FH_REQUEST_USER_PRESENCE);
    if (rc != U2FH_OK)
    {
        reply->responseCode = rc;
        return reply;
    }
    u2fh_devs_done(devs);
    u2fh_global_done();
    reply->length = response_len;
    reply->response = response;//adding printf here prints it out correctly, yet it doesn't when I call it in Utilities::AuthenticateU2F
    reply->responseCode = rc;
    return reply;
}

我希望它返回一个带有响应数据的json对象，如下所示：https : //developers.yubico.com/libu2f-host/，但是我得到了一个随机的ASCII字符串（不能在此处粘贴）并且没有错误