We Keep Coding

Exception thrown when I pass the appropriate argument to method

I am reviewing source code of a voice chat application.
Here I want to run server program, so that any client can contact to server for voice chat. To run my server program I have to pass server name , port number and network interface that I am going to use for voice chat, after passing required arguments I have to call ServerStart method which is done by clicking on Start Checkbox in design view.If user has not passed appropriate type of arguments then it shows error by calling method ShowError().
Now, When I pass serverName, port number and Network Interface then serverName variable reference to null instead of the passed serverName argument.
Why An exception is thrown when I run server program that exception is "The source was not found, but some or all events logs could not be searched. Inaccessible logs: Security."
public partial class ServerWindow
{
private ChatServer server;
public delegate void SetListBoxItem(string str, string type);
public ServerWindow()
{
InitializeComponent();
ObtainNetworkInterfaces();
}
private void cbStartStop_Checked(object sender, RoutedEventArgs e)
{
if (cbStartStop.IsChecked == true)
{
// validate the port number
try
{
var port = Int32.Parse(tbPortNumber.Text);
server = new ChatServer(port, cbInterfaces.SelectedItem, tbServerName.Text);
server.ClientConnected += ServerOnClientConnected;
server.ClientDisconnected += ServerOnClientDisconnected;
var serverName = tbServerName.Text;
if (string.IsNullOrWhiteSpace(serverName))
{
ShowError();
}
else
{
server.StartServer();
SetControls(false);
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
else
{
if (server == null)
return;
server.StopServer();
SetControls(true);
}
}
private void ShowError()
{
MessageBox.Show(#"Please enter valid port number and/or server name");
cbStartStop.IsChecked = false;
}

The problem seems not to be in the code that you posted. After our chat I would suggest to look at this post try the accepted answer. I have the feeling it will solve your problem.
It is usually helpful to use the exception message in the catch clause. :)

blocking listen prevents disconnect

Overview of Problem:
I need to connect to an IRC Server. Once connected, the program will send a message to the channel, and a response will occur over multiple lines back. I need to read these lines and store in a variable for later use. A special character at the end of the message (]) will define the end of the message over multiple lines. Once we have received this character, the IRC session should disconnect and processing should continue.
Situation:
I am using the Smartirc4net library. Calling irc.Disconnect() takes about 40 seconds to disconnect the session. Once we've received the ] character, the session should be disconnected, Listen() should not be blocking, and the rest of the program should continue to run.
Research:
I have found this: smartirc4net listens forever, can't exit thread, and I think it might be the same issue, however, I am unsure of what I need to do to resolve the problem.
Code:
public class IrcCommunicator
{
public IrcClient irc = new IrcClient();
string data;
public string Data { get { return data; } }
// this method we will use to analyse queries (also known as private messages)
public void OnQueryMessage(object sender, IrcEventArgs e)
{
data += e.Data.Message;
if (e.Data.Message.Contains("]"))
{
irc.Disconnect(); //THIS TAKES 40 SECONDS!!!
}
}
public void RunCommand()
{
irc.OnQueryMessage += new IrcEventHandler(OnQueryMessage);
string[] serverlist;
serverlist = new string[] { "127.0.0.1" };
int port = 6667;
string channel = "#test";
try
{
irc.Connect(serverlist, port);
}
catch (ConnectionException e)
{
// something went wrong, the reason will be shown
System.Console.WriteLine("couldn't connect! Reason: " + e.Message);
}
try
{
// here we logon and register our nickname and so on
irc.Login("test", "test");
// join the channel
irc.RfcJoin(channel);
irc.SendMessage(SendType.Message, "test", "!query");
// here we tell the IRC API to go into a receive mode, all events
// will be triggered by _this_ thread (main thread in this case)
// Listen() blocks by default, you can also use ListenOnce() if you
// need that does one IRC operation and then returns, so you need then
// an own loop
irc.Listen();
// when Listen() returns our IRC session is over, to be sure we call
// disconnect manually
irc.Disconnect();
}
catch (Exception e)
{
// this should not happen by just in case we handle it nicely
System.Console.WriteLine("Error occurred! Message: " + e.Message);
System.Console.WriteLine("Exception: " + e.StackTrace);
}
}
}
IrcBot bot = new IrcBot();
bot.RunCommand();
ViewBag.IRC = bot.Data;
As you can see, once this
Thank you for your time to look at this code and read my problem description. If you have any thoughts, or other suggestions, please let me know.
Mike

I was able to successfully disconnect straight away by calling RfcQuit() within OnQueryMessage(), before irc.Disconnect();

IPC Cannot Find the File Specified

using IPC over local TCP to communicate from Client to a Server thread. The connection itself doesn't seem to be throwing any errors, but every time I try to make one of the associated calls, I get this message:
System.Runtime.Remoting.RemotingException: Could not connect to an IPC Port: The System cannot Find the file specified
What I am attempting to figure out is WHY. Because this WAS working correctly, until I transitioned the projects in question (yes, both) from .NET 3.5 to .NET 4.0.
Listen Code
private void ThreadListen()
{
_listenerThread = new Thread(Listen) {Name = "Listener Thread", Priority = ThreadPriority.AboveNormal};
_listenerThread.Start();
}
private void Listen()
{
_listener = new Listener(this);
LifetimeServices.LeaseTime = TimeSpan.FromDays(365);
IDictionary props = new Hashtable();
props["port"] = 63726;
props["name"] = "AGENT";
TcpChannel channel = new TcpChannel(props, null, null);
ChannelServices.RegisterChannel(channel, false);
RemotingServices.Marshal(_listener, "Agent");
Logger.WriteLog(new LogMessage(MethodBase.GetCurrentMethod().Name, "Now Listening for commands..."));
LogEvent("Now Listening for commands...");
}
Selected Client Code
private void InitializeAgent()
{
try
{
_agentController =
(IAgent)RemotingServices.Connect(typeof(IAgent), IPC_URL);
//Note: IPC_URL was originally "ipc://AGENT/AGENT"
// It has been changed to read "tcp://localhost:63726/Agent"
SetAgentPid();
}
catch (Exception ex)
{
HandleError("Unable to initialize the connected agent.", 3850244, ex);
}
}
//This is the method that throws the error
public override void LoadTimer()
{
// first check to see if we have already set the agent process id and set it if not
if (_agentPid < 0)
{
SetAgentPid();
}
try
{
TryStart();
var tries = 0;
while (tries < RUNCHECK_TRYCOUNT)
{
try
{
_agentController.ReloadSettings();//<---Error occurs here
return;
} catch (RemotingException)
{
Thread.Sleep(2000);
tries++;
if (tries == RUNCHECK_TRYCOUNT)
throw;
}
}
}
catch (Exception ex)
{
HandleError("Unable to reload the timer for the connected agent.", 3850243, ex);
}
}
If you need to see something I haven't shown, please ask, I'm pretty much flying blind here.
Edit: I think the issue is the IPC_URL String. It is currently set to "ipc://AGENT/AGENT". The thing is, I have no idea where that came from, why it worked before, or what might be stopping it from working now.
Update
I was able to get the IPC Calls working correctly by changing the IPC_URL String, but I still lack understanding of why what I did worked. Or rather, why the original code stopped working and I needed to change it in the first place.
The string I am using now is "tcp://localhost:63726/Agent"
Can anyone tell me, not why the new string works, I know that...but Why did the original string work before and why did updating the project target to .NET 4.0 break it?

Try Catch Block doesn´t work with Secugen Fingerprint

I'm working on a fingerprint recognition software on c#, WPF Visual Studio 2012, I'm using secugen hamster to take the fingerprints, the software is all done, I can register the fingerprints correctly to the database and succesfull retrieve and compare them for the user access, but sometimes when the software is matching the stored fingerprint with the one just taken of the user, the method MatchIsoTemplate generates an error 'attempt to read or write protected memory. this is often an indication that other memory damaged' and the program stops, I tried to catch this with a try catch but It doesn't work, no matter what the program stops there, this is the code I'm using according to the example of secugen sdk
SGFPMISOTemplateInfo sample_info = new SGFPMISOTemplateInfo();
Int32 err = m_FPM.GetIsoTemplateInfo(customer.Huella, sample_info);
bool matched = false;
for (int i = 0; i < sample_info.TotalSamples; i++)
{
try
{
m_FPM.MatchIsoTemplate(customer.Huella, i, m_VrfMin, 0, m_SecurityLevel, ref matched);
}
catch (Exception)
{
MessageBox.Show("Try Again", "Aviso", MessageBoxButton.OK, MessageBoxImage.Hand);
}
if (matched)
{
//fill data

I answer my own question, finally I discover how to do it, i just need to wrap the method around the [HandleProcessCorruptedStateExceptions] from System.Runtime.ExceptionServices and use a Try Catch in the correct part of the method, like this
[HandleProcessCorruptedStateExceptions]
void myFunction()
{
try
{
switch (sequence)
{
case 0:
sequence++;
m_FPMAux.MatchIsoTemplate(customer.Huella, i, m_VrfMin, 0, m_SecurityLevel, ref matched);
break;
case 1:
sequence++;
m_FPMAux.MatchIsoTemplate(m_VrfMin, 0, customer.Huella, i, m_SecurityLevel, ref matched); .......

ircDotNet bot fails to get messages from IRC channel, long login/logout

I'm trying to write bot for irc channel, which will read messages from channel, recognize if they are commands to him and do some actions depends on command which was send.
I've choose ircDotNet because it was the only library that contains some examples how to use it, but they are actually very outdated, only half of them works. My lack of experience in C# and in programming at all don't allows me to understand stuff without good examples :(
So what my program does now:
logs in to server using password
joins channel
log-outs (very buggy)
I cant capture and send any messages from and to a channel and i cant log-out instantly.
Global classes that used for login and IrcClient class exemplar used everywhere in events
public IrcRegistrationInfo irc_iri
{
get
{
return new IrcUserRegistrationInfo()
{
NickName = "jsBot",
UserName = "jsBot",
RealName = "jsBot",
Password = "oauth:p4$$w0rdH3Re48324729214812489"
};
}
}
public IrcClient gIrcClient = new IrcClient();
Also all current events:
private void Form1_Load(object sender, EventArgs e)
{
try
{
gIrcClient.Connected += ircClient_Connected;
gIrcClient.Disconnected += gIrcClient_Disconnected;
gIrcClient.FloodPreventer = new IrcStandardFloodPreventer(1, 10000);
}
catch (Exception ex) { MessageBox.Show(ex.ToString());}
}
Login button code:
private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
if (!gIrcClient.IsConnected)
{
button1.Text = "Connecting...";
gIrcClient.Connect("irc.twitch.tv", 6667, false, irc_iri);
}
else
{
button1.Text = "Disconnecting...";
gIrcClient.Quit(5000, "bye");
}
}
Logic is: program checks if ircClient connected or not, and do some action. Then after that action appropriate event will raise, enable that button again. But that Quit function works very slow or don't works at all, bot will stay at channel until i don't close my program (maybe i need to dispose ircclient?)
Connect and disconnect events. In connect event, bot will join channel. Bot appears at channel after ~30 seconds after i press connect button, but connected event raised after 2-3 seconds. And same for disconnect - disconnect event raises quickly, but bot stays on channel for much longer time (about 120 seconds).
void ircClient_Connected(object sender, EventArgs e)
{
try
{
if (button1.InvokeRequired)
{
MethodInvoker del = delegate {
button1.Text = "Disconnect";
button1.Enabled = true; };
button1.Invoke(del);
}
else
{
button1.Text = "Disconnect";
button1.Enabled = true;
}
gIrcClient.Channels.Join("#my_channel");
gIrcClient.LocalUser.JoinedChannel += LocalUser_JoinedChannel;
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
void gIrcClient_Disconnected(object sender, EventArgs e)
{
if (!gIrcClient.IsConnected)
{
try
{
if (button1.InvokeRequired)
{
MethodInvoker del = delegate
{
button1.Text = "Connect";
button1.Enabled = true;
};
button1.Invoke(del);
}
else
{
button1.Text = "Connect";
button1.Enabled = true;
}
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
else gIrcClient.Disconnect();
}
Join channel and message received events. They are never raising, have no idea why.
void LocalUser_JoinedChannel(object sender, IrcChannelEventArgs e)
{
try
{
gIrcClient.Channels[0].MessageReceived += Form1_MessageReceived;
gIrcClient.LocalUser.SendMessage(e.Channel, "test");
MessageBox.Show(gIrcClient.Channels[0].Users[0].User.NickName);
MessageBox.Show("bot_join_channel_event_raised");
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
void Form1_MessageReceived(object sender, IrcMessageEventArgs e)
{
try
{
if (e.Text.Equals("asd"))
gIrcClient.LocalUser.SendMessage(e.Targets, "received");
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
So main question is: how do i catch messages from channel and how do i send message to channel? I would appreciate any examples. You can find all code in one piece here: http://pastebin.com/TBkfL3Vq
Thanks

You try to join channel before adding an event.
gIrcClient.Channels.Join("#my_channel");
gIrcClient.LocalUser.JoinedChannel += LocalUser_JoinedChannel;
My suggestion is try adding event first like this:
gIrcClient.LocalUser.JoinedChannel += LocalUser_JoinedChannel;
gIrcClient.Channels.Join("#my_channel");

There is a bug in the IRC.NET library and twitch.tv is using a non-standard message reply that is tripping up IRC.NET.
I have created a bug here describing it. But basically twitch sends "Welcome, GLHF!" as the RPL_WELCOME message. The IRC RFC describes the format of the message to be "Welcome to the Internet Relay Network !#".
IRC.NET parses GLHF out of the welcome message as your nick name, which is used for things like firing the JoinedChannel and MessageRecieved events.
My solution is to download the source code and to comment out where it sets the nick name when receiving the RPL_WELCOME message. It sets the Nickname correctly from the IrcRegistrationInfo passed into the IrcClient constructor and doesn't need to be parsed from the welcome message from twitch. Not sure if this is the case for other IRC servers.
The function is called ProcessMessageReplyWelcome in IrcClientMessageProcessing.cs:
/// <summary>
/// Process RPL_WELCOME responses from the server.
/// </summary>
/// <param name="message">The message received from the server.</param>
[MessageProcessor("001")]
protected void ProcessMessageReplyWelcome(IrcMessage message)
{
Debug.Assert(message.Parameters[0] != null);
Debug.Assert(message.Parameters[1] != null);
this.WelcomeMessage = message.Parameters[1];
// Extract nick name, user name, and host name from welcome message. Use fallback info if not present.
var nickNameIdMatch = Regex.Match(this.WelcomeMessage.Split(' ').Last(), regexNickNameId);
//this.localUser.NickName = nickNameIdMatch.Groups["nick"].GetValue() ?? this.localUser.NickName;
this.localUser.UserName = nickNameIdMatch.Groups["user"].GetValue() ?? this.localUser.UserName;
this.localUser.HostName = nickNameIdMatch.Groups["host"].GetValue() ?? this.localUser.HostName;
this.isRegistered = true;
OnRegistered(new EventArgs());
}
A more involved solution might be to refine the nick name Regex so it does not match on GLHF!, which I think is not a valid nickname.
IRC.NET uses case sensitive string comparisons for finding users by nickname. So the value you pass into the IrcRegistrationInfo for the nickname must match the casing that twitch uses in messages pertaining to you. Which is all lowercase.