GetSentMessageList
public BackendReturnObject GetSentMessageList();
Description
Looks up the list of messages sent to users.
The list shares a common value with the list of received messages(GetReceivedMessageList).(distinguished by message recipient/sender information)
You can keep as many messages as the maximum number set in BACKND Console > Social Management > Settings > Messages, and if you sent a message while the list is full, the oldest message is deleted and the newest message is added to the list.  
Example
Synchronous
Backend.Message.GetSentMessageList();
Asynchronous
Backend.Message.GetSentMessageList((callback) => 
{
    // Post-process
});
SendQueue
SendQueue.Enqueue(Backend.Message.GetSentMessageList, (callback) => 
{
    // Post-process
});
Return cases
Success cases
When the lookup is successful
statusCode : 200  
returnValue : refer to GetReturnValuetoJSON
GetReturnValuetoJSON
It shares a common value with the method that looks up the list of received messages(GetReceivedMessageList) and must be distinguished through the recipient and the sender.
{ 
        rows:
        [
            {
                receiver: // Message recipient's inDate
                    { S : "2018-12-18T01:58:18.722Z" },
                sender: // Message sender's inDate
                    { S : "2018-12-27T00:21:31.322Z" },
                content: // Message content
                    { S : "hello this is user7. How are you doing?" },
                inDate: // Message's inDate
                    { S : "2018-12-27T00:26:22.083Z" },
                senderNickname: // Message sender's nickname
                    { S : "user7" },
                isRead: // Determines whether the recipient has read the message
                    { BOOL : false },
                receiverNickname: // Message recipient's nickname
                    { S : "ryan" },
                isReceiverDelete: // Whether the message recipient has deleted the message
                    { BOOL : false },
                isSenderDelete:  // Whether the message sender has deleted the message
                    { BOOL : false }
            },
            { 
                receiver: [Object],
                sender: [Object],
                content: [Object],
                inDate: [Object],
                senderNickname: [Object],
                isRead: [Object],
                receiverNickname: [Object], 
                isReceiverDelete: [Object],
                isSenderDelete: [Object]
            }
        ]
    }
Sample code
public class MessageItem
{
    public string receiver;
    public string sender;
    public string content;
    public string inDate;
    public string senderNickname;
    public bool isRead;
    public string receiverNickname;
    public bool isReceiverDelete;
    public bool isSenderDelete;
    public override string ToString()
    {
        return $"receiver : {receiver}\n" +
        $"sender : {sender}\n" +
        $"content : {content}\n" +
        $"inDate : {inDate}\n" +
        $"senderNickname : {senderNickname}\n" +
        $"isRead : {isRead}\n" +
        $"receiverNickname : {receiverNickname}\n" +
        $"isReceiverDelete : {isReceiverDelete}\n" +
        $"isSenderDelete : {isSenderDelete}\n";
    }
};
public void GetSentMessageListTest()
{
    var bro = Backend.Message.GetSentMessageList();
    if(!bro.IsSuccess())
        return;
    LitJson.JsonData json = bro.FlattenRows();
    List<MessageItem> messageList = new List<MessageItem>();
    for(int i = 0; i < json.Count; i++)
    {
<!-- MessageItem messageItem = new MessageItem(); -->
<!-- messageItem.receiver = json[i]["receiver"].ToString(); -->
<!-- messageItem.sender = json[i]["sender"].ToString(); -->
<!-- messageItem.content = json[i]["content"].ToString(); -->
<!-- messageItem.inDate = json[i]["inDate"].ToString(); -->
<!-- messageItem.senderNickname = json[i]["senderNickname"].ToString(); -->
<!-- messageItem.isRead = json[i]["isRead"].ToString() == "true" ? true : false; -->
<!-- messageItem.receiverNickname = json[i]["receiverNickname"].ToString(); -->
<!-- messageItem.isReceiverDelete = json[i]["isReceiverDelete"].ToString() == "true" ? true : false; -->
<!-- messageItem.isSenderDelete = json[i]["isSenderDelete"].ToString() == "true" ? true : false; -->
<!-- messageList.Add(messageItem); -->
        Debug.Log(messageItem.ToString());
    }
}
GetSentMessage
public BackendReturnObject GetSentMessage(string messageIndate);
Parameter
| Value | Type | Description | 
|---|---|---|
| messageIndate | string | indate of the sent message to read | 
Description
Retrieves information of one sent message.
Example
Synchronous
// Get the inDate of the message to read.  
BackendReturnObject bro = Backend.Message.GetSentMessageList();
string messageIndate = bro.Rows()[0]["inDate"]["S"].ToString();
//Reads the content of the message to read.  
BackendReturnObject bro2 = Backend.Message.GetSentMessage(messageIndate);
string content = bro2.GetReturnValuetoJSON()["row"]["content"]["S"].ToString();
Asynchronous
// Get the inDate of the message to read.  
Backend.Message.GetSentMessageList(callback =>
{
      string messageIndate = callback.Rows()[0]["inDate"]["S"].ToString();
      //Reads the content of the message to read.  
      Backend.Message.GetSentMessage(messageIndate, callback2 =>
      {
        string content = callback2.GetReturnValuetoJSON()["row"]["content"]["S"].ToString();
      });
});
SendQueue
// Get the inDate of the message to read.  
SendQueue.Enqueue(Backend.Message.GetSentMessageList, callback =>
{
      string messageIndate = callback.Rows()[0]["inDate"]["S"].ToString();
      //Reads the content of the message to read.  
      SendQueue.Enqueue(Backend.Message.GetSentMessage, messageIndate, callback2 =>
      {
          string content = callback2.GetReturnValuetoJSON()["row"]["content"]["S"].ToString();
      });
});
Return cases
Success cases
When the lookup is successful
statusCode : 200  
returnValue : refer to GetReturnValuetoJSON
GetReturnValuetoJSON
{ 
        row:
        {
            receiver: // Message recipient's inDate
                { S : "2018-12-18T01:58:18.722Z" },
            sender: // Message sender's inDate
                { S : "2018-12-27T00:21:31.322Z" },
            content: // Message content
                { S : "hello this is user7. How are you doing?" },
            inDate: // Message's inDate
                { S : "2018-12-27T00:26:22.083Z" },
            senderNickname: // Message sender's nickname
                { S : "user7" },
            isRead: // Determines whether the recipient has read the message
                { BOOL : false },
            receiverNickname: // Message recipient's nickname
                { S : "ryan" },
            isReceiverDelete: // Whether the message recipient has deleted the message
                { BOOL : false },
            isSenderDelete:  // Whether the message sender has deleted the message
                { BOOL : false }
        }
}
Sample code
public class MessageItem
{
    public string receiver;
    public string sender;
    public string content;
    public string inDate;
    public string senderNickname;
    public bool isRead;
    public string receiverNickname;
    public bool isReceiverDelete;
    public bool isSenderDelete;
    public override string ToString()
    {
        return $"receiver : {receiver}\n" +
        $"sender : {sender}\n" +
        $"content : {content}\n" +
        $"inDate : {inDate}\n" +
        $"senderNickname : {senderNickname}\n" +
        $"isRead : {isRead}\n" +
        $"receiverNickname : {receiverNickname}\n" +
        $"isReceiverDelete : {isReceiverDelete}\n" +
        $"isSenderDelete : {isSenderDelete}\n";
    }
};
public void GetSentMessageTest()
{
    var bro = Backend.Message.GetSentMessage("2022-03-14T07:21:01.953Z");
    if(!bro.IsSuccess())
        return;
    LitJson.JsonData json = bro.GetFlattenJSON();
<!-- MessageItem messageItem = new MessageItem(); -->
<!-- messageItem.receiver = json["row"]["receiver"].ToString(); -->
<!-- messageItem.sender = json["row"]["sender"].ToString(); -->
<!-- messageItem.content = json["row"]["content"].ToString(); -->
<!-- messageItem.inDate = json["row"]["inDate"].ToString(); -->
<!-- messageItem.senderNickname = json["row"]["senderNickname"].ToString(); -->
<!-- messageItem.isRead = json["row"]["isRead"].ToString() == "true" ? true : false; -->
<!-- messageItem.receiverNickname = json["row"]["receiverNickname"].ToString(); -->
<!-- messageItem.isReceiverDelete = json["row"]["isReceiverDelete"].ToString() == "true" ? true : false; -->
<!-- messageItem.isSenderDelete = json["row"]["isSenderDelete"].ToString() == "true" ? true : false; -->
    Debug.Log(messageItem.ToString());
}