C# 如何使用.NET LLRP库：Org.LLRP.LTK.LLRPV1.LLRPXmlParser.parsexmltolrpmessage

我正在使用LLRP库开发一个应用程序。 网关（计算机）从读卡器（使用本地主机的模拟读卡器）接收到我的消息后，我想使用

Org.LLRP.LTK.LLRPV1.LLRPXmlParser.ParseXMLToLLRPMessage(_xmlReceived, out msg, out enumType);

但是，我在手表中检查它（VS2013 Ultimate）：msg为null，enumType为0

你能给我一些建议吗

我的代码是：

public static void ConvertXmlToLLRPMessage()
{
    Org.LLRP.LTK.LLRPV1.DataType.Message msg;  //Only Message type is accepted.
    Org.LLRP.LTK.LLRPV1.ENUM_LLRP_MSG_TYPE enumType; //Only ENUM_LLRP_MSG_TYPE type is accepted.

    Org.LLRP.LTK.LLRPV1.LLRPXmlParser.ParseXMLToLLRPMessage(_xmlReceived, out msg, out enumType);

    Console.WriteLine();
    Console.WriteLine("Print out _xmlReceived, inside ConvertXmlToLLRPMessage.");
    Console.WriteLine(_xmlReceived);
    Console.WriteLine();
    Console.WriteLine("Out msg from ParseXMLToLLRPMessage:\n"); Console.WriteLine(msg); Console.WriteLine();
    Console.WriteLine("Out enumType from ParseXMLToLLRPMessage:\n"); Console.WriteLine(enumType); Console.WriteLine();
}

public static void testData_PARAM_ROSpecID()
{
    //create and object
    PARAM_ROSpecID _rec_PARAM_ROSpecID = new PARAM_ROSpecID();

    //assign value to an object
    _rec_PARAM_ROSpecID.ROSpecID = 789;

    //Convert obj to xml
    string _xmlData = ConvertObjectToXml(_rec_PARAM_ROSpecID);

    //Convert xml to byte array
    byte [] _byteArray = CommServerSend.getSendBuffInByteAry(_xmlData);

    //Send out.
    CommServerReceive._incomingDataObj.Send(_byteArray);

    return;
}

\u xmlReceived

是从127.0.0.1:5084接收的XML转换数据。我必须检查它，它是正确的，这是读者发出的

在阅读器端，我模拟阅读器向网关发送消息。 在读卡器端，代码是：

public static void ConvertXmlToLLRPMessage()
{
    Org.LLRP.LTK.LLRPV1.DataType.Message msg;  //Only Message type is accepted.
    Org.LLRP.LTK.LLRPV1.ENUM_LLRP_MSG_TYPE enumType; //Only ENUM_LLRP_MSG_TYPE type is accepted.

    Org.LLRP.LTK.LLRPV1.LLRPXmlParser.ParseXMLToLLRPMessage(_xmlReceived, out msg, out enumType);

    Console.WriteLine();
    Console.WriteLine("Print out _xmlReceived, inside ConvertXmlToLLRPMessage.");
    Console.WriteLine(_xmlReceived);
    Console.WriteLine();
    Console.WriteLine("Out msg from ParseXMLToLLRPMessage:\n"); Console.WriteLine(msg); Console.WriteLine();
    Console.WriteLine("Out enumType from ParseXMLToLLRPMessage:\n"); Console.WriteLine(enumType); Console.WriteLine();
}

public static void testData_PARAM_ROSpecID()
{
    //create and object
    PARAM_ROSpecID _rec_PARAM_ROSpecID = new PARAM_ROSpecID();

    //assign value to an object
    _rec_PARAM_ROSpecID.ROSpecID = 789;

    //Convert obj to xml
    string _xmlData = ConvertObjectToXml(_rec_PARAM_ROSpecID);

    //Convert xml to byte array
    byte [] _byteArray = CommServerSend.getSendBuffInByteAry(_xmlData);

    //Send out.
    CommServerReceive._incomingDataObj.Send(_byteArray);

    return;
}

将数据读取器打印输出发送到网关：

<?xml version="1.0" encoding="utf-16"?>
<PARAM_ROSpecID xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ROSpecID>789</ROSpecID>
</PARAM_ROSpecID> 

请帮助我并尽快回复。

---

非常感谢您的努力。

null obj变量意味着该方法无法从传入的xml中提取消息。我将更仔细地查看xml，看看是否有什么地方出错

下面是代码应该如何使用ParseXMLToLLRPMessage（）查找的示例：

---

注意，ParseXMLToLLRPMessage用于将xml转换为LLRP消息。读者会发回LLRP信息。非常感谢丹尼尔·科恩。我要试试这个，干杯！

            Org.LLRP.LTK.LLRPV1.DataType.Message obj;
            ENUM_LLRP_MSG_TYPE msg_type;

            // read the XML from a file and validate its an SET_READER_CONFIG
            try
            {
                FileStream fs = new FileStream(@"setReaderConfig.xml", FileMode.Open);
                StreamReader sr = new StreamReader(fs);
                string s = sr.ReadToEnd();
                fs.Close();

                LLRPXmlParser.ParseXMLToLLRPMessage(s, out obj, out msg_type);

                if (obj == null || msg_type != ENUM_LLRP_MSG_TYPE.SET_READER_CONFIG)
                {
                    Console.WriteLine("Could not extract message from XML");
                    return;
                }
            }
            catch
            {
                Console.WriteLine("Unable to convert to valid XML");
                return;
            }

            // Communicate that message to the reader
            MSG_SET_READER_CONFIG msg = (MSG_SET_READER_CONFIG)obj;