After asking my first question and reading some links provided I decided to just and port the communication layer from the open source vb.net project I used for a few months to C#. I started off good. Now I do have a problem.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
namespace Eclipse_5._0
{
class PacketHandler
{
#region Packet Constructors
private delegate void PacketDelegate(int Index, byte[] Data);
private PacketDelegate[] Packet;
public PacketHandler()
{
Packet(Enumerations.ClientPackets.CAddChar) = HandleAddChar;
}
#endregion
#region Packet Methods
public void Handledata(int Index, byte[] Data, int MsgType)
{
ByteBuffer Buff = new ByteBuffer();
Buff.WriteBytes(Data);
if (MsgType < 0)
{
return;
}
if (MsgType >= (int)Enumerations.ClientPackets.CQuit)
{
return;
}
Packet(MsgType).Invoke(Index, Buff.ReadBytes(Buff.Length()));
Buff.Dispose();
}
public void HandleNewAccount(int Index, byte[] Data)
{
//TODO: Add New Player Account File.
}
public void HandleAddChar(int Index, byte[] Data)
{
//TODO: Add New Character to Player Account File.
}
#endregion
}
}
The following line has the error
Packet(Enumerations.ClientPackets.CAddChar) = HandleAddChar;
Any help would be great.
Overall, looks like quite a few problems with this code, but if you can post the error details then it might help us help you along a little sooner. Lets looks at maybe getting you passed this hurdle:
Packet is an array, so it looks like you want access by index like this:
Packet[Enumerations.ClientPackets.CAddChar] = HandleAddChar;
But an array is a reference type, and so needs to be instantiated - meaning even with the above in place you'll get a NullReferenceException. Furthermore, HandleAddChar is a method and requires arguments as per the parameters as part of its definition; and what you're intending to do is not what you would be expressing even with passing the appropriate values. So:
public PacketHandler()
{
Packet = new PacketDelegate[1];
Packet[0] = new PacketDelegate(HandleAddChar);
}
Note that I've removed use of Enumerations.ClientPackets.CAddChar as it is meaningless in this context, the idea is that the array must be instantiated and to an appropriate capacity. Lastly, you don't want to call HandleAddChar here directly, we need a delegate reference, so that's what we create and insert into the array.
Related
I need to do serialization and deserialization using below code. But always i am getting "Dynamic type is not a contract-type" error while serializing. I am stuck with this. I need to achieve this someway Can somebody help me on this?
using ProtoBuf;
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
namespace ProtoSerialization
{
class Program
{
static void Main(string[] args)
{
try
{
byte[] arr;
ClassA obj = new ClassA();
obj.ColumnList = new List<int> {1 };
using (var stream = new MemoryStream())
{
ProtoBuf.Serializer.Serialize(stream, obj);
arr = stream.ToArray();
}
using(var stream=new MemoryStream(arr))
{
var result = Serializer.Deserialize(typeof(ClassA), stream);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadKey();
}
}
}
[ProtoContract]
public class ClassA
{
[ProtoMember(1,DynamicType =true)]
public IList ColumnList;
}
}
I strongly advise against using the dynamic feature, here or elsewhere. It is deprecated in V3, probably permanently. It looks like what you really want here is something like a Value from struct.proto. This doesn't have inbuilt support in protobuf-net currently, but I'll probably add it soon. As for now: I'd probably advise using an array of a type that has those things as fields. If you make the layout look like Value does, in terms of the field numbers, it should be directly swappable later.
Mostly copied from question about protobuf dynamic array.
The documentation for dynamic arrays state:
DynamicType - stores additional Type information with the type (by default it includes the AssemblyQualifiedName, although this can be controlled by the user). This makes it possible to serialize weak models, i.e. where object is used for property members, however currently this is limited to contract types (not primitives), and does not work for types with inheritance (these limitations may be removed at a later time). Like with AsReference, this uses a very different layout format
You have a primitive, therefore you can not use DynamicType. As explained in the error message you got.
A workaround could be to wrap the primitives you want to store in another type with a defined contract.
I have the following code which works fine when I use it within a Windows Forms application, however the application I'm writing needs to run as a Windows service, and when I moved my code into the Windows Service template in Visual Studio 2015 Community Edition, I get the following error.
Cannot implicitly convert type "MyWindowsService.Main" to "System.ComponentModel.ISynchronizeVoke". An explicit conversion exists (are you missing a cast?)
Could anyone shed some light on why I am getting this error, and what I need to do to resolve it?
The code which throws the error is the line below, and it is located within the OnStart method of my main class (named Main.cs). The code is used to create an instance of the DataSubscriber class (AdvancedHMI library).
dataSubscribers[dataSubscriberIndex].SynchronizingObject = this;
It has to have something to do with the fact that the code is in a Windows service template, because using this works perfectly in my forms application running the same code.
UPDATE
Correction, I've attempted to cast this to the required type, and now get the following error on run.
Additional information: Unable to cast object of type 'MyWindowsService.Main' to type 'System.ComponentModel.ISynchronizeInvoke'.
Code:
dataSubscribers[dataSubscriberIndex].SynchronizingObject = (System.ComponentModel.ISynchronizeInvoke)this;
UPDATE
I've included the entire contents of the Main.cs file from my Windows Service application.
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using AdvancedHMIDrivers;
using AdvancedHMIControls;
using MfgControl.AdvancedHMI.Drivers;
using MfgControl.AdvancedHMI.Controls;
using System.Collections.ObjectModel;
namespace PLCHistoricDataHarvester {
public partial class Main : ServiceBase {
private EthernetIPforCLXCom commObject = new EthernetIPforCLXCom();
private globals globals = new globals();
private Dictionary<String, String> operationLines = new Dictionary<String, String>();
private Dictionary<String, String> tags = new Dictionary<String, String>();
private Collection<DataSubscriber> dataSubscribers = new Collection<DataSubscriber>();
private int harvesterQueueCount = 0;
private string harvesterInsertValues = String.Empty;
public Main() {
InitializeComponent();
}
protected override void OnStart(string[] args) {
// Initialize our harvester program
initializeHarvester();
Console.WriteLine("The program has started");
}
protected override void OnStop() {
// Call code when the service is stopped
Console.WriteLine("Program has stopped");
Console.ReadLine();
}
public void initializeHarvester() {
// First, we connect to the database using our global connection object
globals.dbConn.DatabaseName = "operations";
if (!globals.dbConn.IsConnect()) {
// TODO: Unable to connect to database. What do we do?
}
// Second, we connect to the database and pull data from the settings table
globals.initializeSettingsMain();
// Set IP address of PLC
commObject.IPAddress = globals.getSettingsMain("Processor_IP");
// Pull distinct count of our parent tags (Machines ex: Line 1, etc)
operationLines = globals.getOperationLines();
// If we have at least 1 operation line defined...we continue
if (operationLines.Keys.Count > 0) {
//Now we loop over the operation lines, and pull back the data points
int dataSubscriberIndex = 0;
foreach (KeyValuePair<String, String> lines in operationLines) {
int line_id = int.Parse(lines.Key);
string name = lines.Value;
tags = globals.getTags(line_id);
// If we have at least 1 tag for this operation line, we continue...
if (tags.Keys.Count > 0 && tags["tags"].ToString().IndexOf(",") != -1) {
// Create our dataSubscriber object
dataSubscribers.Add(new DataSubscriber());
dataSubscribers[dataSubscriberIndex].SynchronizingObject = (ISynchronizeInvoke)this;
dataSubscribers[dataSubscriberIndex].CommComponent = commObject;
dataSubscribers[dataSubscriberIndex].PollRate = 1000;
dataSubscribers[dataSubscriberIndex].PLCAddressValue = tags["tags"];
dataSubscribers[dataSubscriberIndex].DataChanged += new EventHandler<MfgControl.AdvancedHMI.Drivers.Common.PlcComEventArgs>(subscribeCallback);
// Increment our dataSubscriberIndex
dataSubscriberIndex++;
}
}
}
}
private void subscribeCallback(object sender, MfgControl.AdvancedHMI.Drivers.Common.PlcComEventArgs e) {
// code removed as it is irrelevant
}
}
}
The error message says this:
An explicit conversion exists (are you missing a cast?)
So add a cast like this:
dataSubscribers[dataSubscriberIndex].SynchronizingObject = (ISynchronizeInvoke)this;
^^^^^^^^^^^^^^^^^^^^
//Add this
If you've got a console app, the easiest way to convert it to a windows service is by using Topshelf, a nuget package which lets you run in either console mode or nt service mode.
Here's the quickstart guide.
We use it to write services all the time and it helps you avoid this kind of fragile shenanigans.
I'm trying to read the static securities definition file from the CME, located at:
ftp://ftp.cmegroup.com/fix/Production/secdef.dat.gz
Since they seem to be standard fix messages, I thought I could use QuickFix to help me read them into C# rather than parsing the file myself. I created a test app that basically does what I want, but I'm having 2 issues:
1) I'm getting a QuickFix exception "Invalid message: Header fields out of order" when forming the message from the string. If I set the "validate" boolean to false, this message disappears and the constructor succeeds, but may be an indicator for the next issue.
2) Upon calling p.Crack, I'm getting the QuickFix exception "QuickFix.UnsupportedMessageType", but there doesn't seem to be any indication of what the message type is that is supposedly unsupported.
Anyway, maybe QuickFix wasn't intended to be used in this way, but any ideas on how to get this to work?
using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using QuickFix;
namespace TestQuickFix
{
class Program : QuickFix.MessageCracker
{
static void Main(string[] args)
{
int count = 0;
string line;
Program p = new Program();
StreamReader file = new StreamReader(#"C:\secdef.dat");
while (((line = file.ReadLine()) != null && count < 10))
{
// ISSUE #1 REQUIRES false 2ND ARG WHEN CREATING THE MESSAGE
Message m = new Message(line, false);
// ISSUE #2 Exception of type 'QuickFix.UnsupportedMessageType' was thrown.
p.Crack(m, new SessionID("beginString", "senderCompID", "targetCompID"));
}
file.Close();
}
public void OnMessage(QuickFix.FIX50.SecurityDefinition secDef, SessionID sessionID)
{
Console.WriteLine(secDef.ToString());
}
}
}
The messages seems to be in FIX50sp2 format, supported by QuickFIX. (Please take a look at the tag 1128=9).
http://www.onixs.biz/fix-dictionary/5.0.SP2/tagNum_1128.html
BUT every single message seems to be not-well formatted. In the header are missed tag 8 (should be the BeginString), and also the tag 56 (TargetCompID), that are mandatory.
Therefore in order to load a single line in a message you must put the "false" parameter to avoid validation.
I suppose the second error is related to the not-well formatted messages.
After emailing the QuickFix listserv with this question, I was able to get enough information to get this to work. Although each line still seems to be malformed for some reason, if I keep validation off, I can get the parser to do exactly what I need it to with the following simplified code:
using System;
using System.IO;
using QuickFix;
using QuickFix.DataDictionary;
namespace TestQuickFix
{
class Program
{
private const int MAX_LINES = 10;
static void Main(string[] args)
{
DataDictionary dd = new QuickFix.DataDictionary.DataDictionary("fix\\FIX50SP2.xml");
StreamReader file = new StreamReader(#"C:\secdef.dat");
int count = 0; string line;
while (((line = file.ReadLine()) != null && count++ < MAX_LINES))
{
QuickFix.FIX50.SecurityDefinition secDef = new QuickFix.FIX50.SecurityDefinition();
secDef.FromString(line, false, dd, dd);
Console.WriteLine(secDef.SecurityDesc);
}
file.Close();
}
}
}
I have a db4o database that was generate by a Java app and I'm trying to read it using a C# app.
However, when running the following line of code:
IObjectContainer db = Db4oEmbedded.OpenFile(#"..\..\..\Databases\people.db4o");
I get the following error:
Unable to cast object of type
'Db4objects.Db4o.Reflect.Generic.GenericObject' to type
'Db4objects.Db4o.Ext.Db4oDatabase'.
Any ideas? I know there are person objects that contain personId fields (along with others) in the DB. I'm using db4o version 8. I'm not sure what version was used to generate the database.
The entire program is:
using System;
using System.Collections.Generic;
using System.Linq;
using Db4objects.Db4o;
using Db4objects.Db4o.Config;
using MyCompany.Domain;
namespace MyCompany.Anonymizer
{
internal class Program
{
// Private methods.
private static IEmbeddedConfiguration ConfigureAlias()
{
IEmbeddedConfiguration configuration = Db4oEmbedded.NewConfiguration();
configuration.Common.AddAlias(new TypeAlias("com.theircompany.Person", "MyCompany.Domain.Person, MyCompany.Domain"));
configuration.Common.Add(new JavaSupport());
return configuration;
}
private static void Main(string[] args)
{
IObjectContainer db = Db4oEmbedded.OpenFile(#"..\..\..\Databases\people.db4o");
try
{
IList<Person> result = db.Query<Person>();
for (int i = 0; i < result.Count; i++)
{
Person person = result[i];
Console.WriteLine(string.Format("Person ID: {0}", person.personId));
}
}
finally
{
db.Close();
}
}
}
}
The most common scenario in which this exception is thrown is when db4o fails to resolve the type of a stored object.
In your case, db4o is failing to read one of its internal objects which makes me believe you have not passed the configuration to the OpenFile() method (surely, the code you have posted is not calling ConfigureAlias() method);
Keep in mind that as of version 8.0 no further improvement will be done regarding cross platform support (you can read more details here).
So I'm trying to write a C# function print_r() that prints out information about a value passed much in the same way that the PHP print_r() function works.
What I'm doing is taking in an object as an input in to the function, and depending on what type it is, I'll output the value, or loop through an array and print out the values inside the array. I have no problem printing out basic values, but when I try to loop through the object if I detect it is an array, I get an error from C# saying "Error 1 foreach statement cannot operate on variables of type 'object' because 'object' does not contain a public definition for 'GetEnumerator'".
Now I'm assuming this is just because object doesn't implement IEnumerable<>, but is there any way that I can process this taking in the input as type object?
This is my current code for the function (the IEnumerable<> part is blank in terms of content, but this is the code that is giving me an error.
Thanks.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Reflection;
namespace ConsoleApplication1
{
class Program
{
static void print_r(object val)
{
if (val.GetType() == typeof(string))
{
Console.Write(val);
return;
}
else if (val.GetType().GetInterface(typeof(IEnumerable).FullName) != null)
{
foreach (object i in val)
{
// Process val as array
}
}
else
{
Console.Write(val);
return;
}
}
static void Main(string[] args)
{
int[] x = { 1, 4, 5, 6, 7, 8 };
print_r(x);
Console.Read();
}
}
}
val is declared as an Object. After checking if it's an IEnumerable (which you can do simply with is, as shown, but this works also with your original code) you have to cast it explicitly
else if (val is IEnumerable)
{
var e = val as IEnumerable;
foreach (var i in e)
{
Console.WriteLine(i.ToString());
}
}
There is LINQPad that has Dump() extension method, but you can use it only in LINQPad
We can write our own extension method to dump any object to html and view it in browser.
You need to reference LINQPad.exe
public static class Extension
{
public static void Dump<T>(this T o)
{
string localUrl = Path.GetTempFileName() + ".html";
using (var writer = LINQPad.Util.CreateXhtmlWriter(true))
{
writer.Write(o);
File.WriteAllText(localUrl, writer.ToString());
}
Process.Start(localUrl);
}
}
You would have to use reflection to do this I think, I want a similiar function and ouputted my objects into tables using reflection.
I dont have the code to hand but found the basis of my solution here!