RtcEngine rtcEngine = RtcEngine.create(mContext, appId, mEngineEventHandler.mRtcEventHandler); rtcEngine.joinChannel(null, channel, "Extraoptional data", uid); mRtcEngine.leaveChannel();

let engine = AgoraRtcEngineKit.sharedEngineWithAppId("AppId", delegate: self)
engine.enableVideo()
engine.joinChannelByKey(nil, channelName: "channelName", info: nil, uid: 0, joinSuccess: nil)

var client = AgoraRTC.createRtcClient();
client.init(appId, function() {
client.join(appId, channel, undefined, successCallback, errorCallback);
}, errorCallback);

BOOL CAgoraObject::JoinChannel(LPCSTR lpChannelName, UINT nUID){
int nRet = 0;
nRet = m_lpAgoraEngineEx->joinChannel(NULL, lpChannelName, NULL, nUID);
return nRet == 0 ? TRUE : FALSE;
}

agoraClient.join(token, channel,uid, function(){console.log('join success')}, function(err){console.log('join failed')}