关于在C++DLL中使用C#对象的问题

class ClientListener : public IClientListener
{
public:
    ClientListener(IClientListenerEx ^ pListener) 
    {
            //pListener为C#对象，我怎么用变量保存它
    }
private:
    IClientListenerEx ^ m_pListener;//在C++中直接定义此变量有错
}

class ClientListener : public IClientListener
{
public:
ClientListener(IClientListenerEx ^ pListener)
{
gcrootpTmp = new gcroot(pListener);
m_pListener = static_cast<void>(pTmp);
}
~ClientListener()
{
if (m_pListener)
{
gcrootpTmp = static_cast>(m_pListener);
delete pTmp;
m_pListener = NULL;
}
}
void Call(int code)
{
gcrootpTmp = static_cast>(m_pListener);
((IClientListenerEx ^)*pTmp)->OnStatusChanged(code);
}
private:
void* m_pListener;
}

有人可以指导一下吗？