ser_conn () outside how to write Thread function in c++ COM Dll

 STDMETHODIMP CThreadingClas::ser_conn(BSTR serport, BSTR log, BSTR pass, BSTR* ret)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());

	// TODO: Add your implementation code here
	CStringA s(serport);
	csServer_Server=s;
	CStringA p1(pass);
	csServer_Password=p1;
	csServer_Login=_wtoi(log);
	int res;
	if((res=server_q->Connect(csServer_Server))==RET_OK && (res=server_f->Connect(csServer_Server))==RET_OK)
	{
		if((res=server_q->Login(csServer_Login,csServer_Password))==RET_OK && (res=server_f->Login(csServer_Login,csServer_Password))==RET_OK)
		{
		*ret=bstr_t(server_q->ErrorDescription(res));
	}
	else
	{
		*ret=bstr_t(server_q->ErrorDescription(res));
	}
	}
	else
	{
		*ret=bstr_t(server_q->ErrorDescription(res));
	}
	return S_OK;