public static extern int RegisterOnOverseaFutureOpenInterestCallBack(FOnOverseaFutureOpenInterest OnOverseaFutureOpenInterest);
private void btnOpenInterest_Click(object sender, EventArgs e) { fOnOverseaFutureOpenInterest = new FOnOverseaFutureOpenInterest(OnOverseaFutureOpenInterest); m_nCode = Functions.RegisterOnOverseaFutureOpenInterestCallBack(fOnOverseaFutureOpenInterest); m_nCode = Functions.GetOverseaFutureOpenInterest(m_UserAccount); }