public void loadDiscussion()
    {
        GameObject gameObject = GameObject.Find("mChannelNameInputField");
        InputField input      = gameObject.GetComponent <InputField> ();

        channelName = input.text;
        if (string.IsNullOrEmpty(channelName))
        {
            logD("channelName is empty");
            input.placeholder.GetComponent <Text> ().text = "Please input your chatRoomID";
        }
        else
        {
            logD("channelName is not null");

//			zhang
            mRtcEngine.AgoraIMInit(appKey);
            mRtcEngine.AgoraIMConnect("qyKknH03CtaTmAVpp5FhCMz7psBGhT4XrcX5ZITBY4pOJ/9FDpbJ6a9gymzDN1i3deDs7BFxUHYhKacTGi+Qhw==");
            mRtcEngine.LeaveChannel();


            //12345
            //mRtcEngine.AgoraIMInit("82hegw5u8y3dx");
            //mRtcEngine.AgoraIMConnect("YXf2Dp3I3+iM7KFYIcp6i8z7psBGhT4XrcX5ZITBY4pOJ/9FDpbJ6WTAec4LrsATB1mr7uno1Kk1ssc7DJOQGQ==");
            //mRtcEngine.AgoraIMConnect("XKSg2GY5Jth5eJuHBEGbZNRl9bQ/jDob3/tLwFxUFoeSyZwLtsrMPoDSGo531Exqh8vB3WPzu1pHTCKB3wnLMW80nPpqk+OW");
            //mRtcEngine.LeaveChannel();
//			// enable log
            mRtcEngine.AgoraIMInitMessageReceiveListener();
            userInfo             = new UserInfo();
            userInfo.userId      = "zhang";
            userInfo.name        = "zhang0000000";
            userInfo.portraitUri = "https://www.alibaba.com/";

            SceneManager.LoadScene("IMScene", LoadSceneMode.Single);
        }
    }