MqttSyncClientReadTopicPayload 方法

public OperateResult<MqttClientApplicationMessage> ReadTopicPayload(
	string topic,
	Action<long, long> receiveProgress = null
)

Public Function ReadTopicPayload ( 
	topic As String,
	Optional receiveProgress As Action(Of Long, Long) = Nothing
) As OperateResult(Of MqttClientApplicationMessage)

public:
OperateResult<MqttClientApplicationMessage^>^ ReadTopicPayload(
	String^ topic, 
	Action<long long, long long>^ receiveProgress = nullptr
)

member ReadTopicPayload : 
        topic : string * 
        ?receiveProgress : Action<int64, int64> 
(* Defaults:
        let _receiveProgress = defaultArg receiveProgress null
*)
-> OperateResult<MqttClientApplicationMessage>