C# Discussion Boards - CodeProject

Re: filling a column with property value of object

Aresto196415-Apr-20 3:33

Aresto1964

15-Apr-20 3:33

thank you it works fine for me .

Re: filling a column with property value of object

OriginalGriff14-Apr-20 21:34

OriginalGriff

14-Apr-20 21:34

First, fix the compilation errors in your code: use of ')" where it should be '}', missing class keyword on class definitions, missing uppercase on List, that sort of thing.
So us code that works to demonstrate your problem - not a lump of crap your threw together and didn't check at all ...

You can display what you want as the cell content, just override ToStrign in your class:

public class myclass2
    {
    public int Id { set; get; }
    public string Name { set; get; }
    public override string ToString()
        {
        return $"{Id}:{Name}";
        }
    }

You can also set the column header text to something more human readable than the property name - just set the HeaderText property of the column:

myDataGridView.DataSource = mylist;
myDataGridView.Columns[1].HeaderText = "My other class";

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Targa files displayed in openFileDialog

MikeBr13-Apr-20 22:26

MikeBr

13-Apr-20 22:26

I have two c# form apps which use openFileDialog. One displays the targa bitmap with the system thumbnail in the corner (app1) and the other displays the system thumbnail(app2). The one which fails to display the targa bitmap shows the option to create a new folder while the other does not offer that option.
App1 I created using Microsoft tutorial1 Create a picture Viewer
App2 is called TargaImage_demo downloaded from this site.
I have compared the two projects making sure they use the same .Net framework but I cannot see why one works as I want it to do while the other fails to display the bitmaps.

Does anyone know why there is a difference between the two openFileDialogs?

Re: Targa files displayed in openFileDialog

OriginalGriff13-Apr-20 23:19

OriginalGriff

13-Apr-20 23:19

Don't post this here - if you got the code from an article, then there is a "Add a Comment or Question" button at the bottom of that article, which causes an email to be sent to the author. They are then alerted that you wish to speak to them.
Posting this here relies on them "dropping by" and realising it is for them.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Re: Targa files displayed in openFileDialog

Richard Deeming14-Apr-20 0:15

Richard Deeming

14-Apr-20 0:15

At a guess, have you called EnableVisualStyles[^] in one application but not the other?

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Targa files displayed in openFileDialog

Dave Kreskowiak14-Apr-20 4:37

Dave Kreskowiak

14-Apr-20 4:37

OpenFileDialog has nothing to do with displaying the image at all.

An OFD is only concerned with one thing, returning a string containing the path to a file. That's it. Nothing else.

The code to display the image is somewhere else and is where the problem appears to be.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Programming Tcp with C#

Member 1478193513-Apr-20 21:13

Member 14781935

13-Apr-20 21:13

Hi all,

I have a project which is divided to two parts:

1/ The first one is TCP handling message from a pertinant connection(so connection should be always connected till user disconnect it).
2/ The second part is another application which process the messages recieved.

So please for the first on how can handle message from a connection already established and send it internaly to the second project and after that reply.

Re: Programming Tcp with C#

OriginalGriff13-Apr-20 21:25

OriginalGriff

13-Apr-20 21:25

What have you tried?
Where are you stuck?
What help do you need?

THis is a broad subject with no real detail provided, and we can't just tell you what to do, because we have no idea what stage you are at already. Heck, we don't even know if the "second application" is a separate process from the first - and that's unbelievably relevant!

So answer the three questions above, and remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Re: Programming Tcp with C#

Member 1478193519-Apr-20 3:24

Member 14781935

19-Apr-20 3:24

Dear all,

I have two applications:

Console one it server for Tcp pertinant socket :

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

using System.IO;

namespace Asychn_Server
{
    // State object for reading client data asynchronously  
    public class StateObject
    {
        // Client  socket.  
        public Socket workSocket = null;
        // Size of receive buffer.  
        public const int BufferSize = 1024;
        // Receive buffer.  
        public byte[] buffer = new byte[BufferSize];
        // Received data string.  
        public StringBuilder sb = new StringBuilder();
    }
    public class AsynchronousSocketListener
    {
        // Thread signal.  
        public static ManualResetEvent allDone = new ManualResetEvent(false);

        public AsynchronousSocketListener()
        {
        }

        public static void StartListening()
        {
            // Establish the local endpoint for the socket.  
            // The DNS name of the computer  
            // running the listener is "host.contoso.com".  
            IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
            IPAddress ipAddress = ipHostInfo.AddressList[0];
            IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);

            // Create a TCP/IP socket.  
            Socket listener = new Socket(ipAddress.AddressFamily,
                SocketType.Stream, ProtocolType.Tcp);

            // Bind the socket to the local endpoint and listen for incoming connections.  
            try
            {
                listener.Bind(localEndPoint);
                listener.Listen(100);

                while (true)
                {
                    // Set the event to nonsignaled state.  
                    allDone.Reset();

                    // Start an asynchronous socket to listen for connections.  
                    Console.WriteLine("Waiting for a connection...");
                    listener.BeginAccept(
                        new AsyncCallback(AcceptCallback),
                        listener);

                    // Wait until a connection is made before continuing.  
                    allDone.WaitOne();
                }

            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }

            Console.WriteLine("\nPress ENTER to continue...");
            Console.Read();

        }

        public static void AcceptCallback(IAsyncResult ar)
        {
            // Signal the main thread to continue.  
            allDone.Set();

            // Get the socket that handles the client request.  
            Socket listener = (Socket)ar.AsyncState;
            Socket handler = listener.EndAccept(ar);

            // Create the state object.  
            StateObject state = new StateObject();
            state.workSocket = handler;
            handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                new AsyncCallback(ReadCallback), state);
        }

        public static void ReadCallback(IAsyncResult ar)
        {
            String content = String.Empty;

            // Retrieve the state object and the handler socket  
            // from the asynchronous state object.  
            StateObject state = (StateObject)ar.AsyncState;
            Socket handler = state.workSocket;

            // Read data from the client socket.
            int bytesRead = handler.EndReceive(ar);

            if (bytesRead > 0)
            {
                // There  might be more data, so store the data received so far.  
                state.sb.Append(Encoding.ASCII.GetString(
                    state.buffer, 0, bytesRead));

                // Check for end-of-file tag. If it is not there, read
                // more data.  
                content = state.sb.ToString();

                log("Socket status : " + handler.Connected);
                log("From socket : " + content);
                // Echo the data back to the client.  
                Send(handler, content);
                log("Socket status : " + handler.Connected);
                //if (content.IndexOf("<EOF>") > -1)
                //{
                //    // All the data has been read from the
                //    // client. Display it on the console.  
                //    //Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
                //    //    content.Length, content);
                //    log("From socket : " + content);
                //    // Echo the data back to the client.  
                //    Send(handler, content);
                //}
                //else
                //{
                //    // Not all data received. Get more.  
                //    handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                //    new AsyncCallback(ReadCallback), state);
                //}
            }
        }

        private static void Send(Socket handler, String data)
        {
            // Convert the string data to byte data using ASCII encoding.  
            byte[] byteData = Encoding.ASCII.GetBytes(data);

            // Begin sending the data to the remote device.  
            handler.BeginSend(byteData, 0, byteData.Length, 0,
                new AsyncCallback(SendCallback), handler);
        }

        private static void SendCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket handler = (Socket)ar.AsyncState;

                // Complete sending the data to the remote device.  
                int bytesSent = handler.EndSend(ar);
                //Console.WriteLine("Sent {0} bytes to client.", bytesSent);
                  log("TO socket : " + bytesSent + " -As reply");
                log("Socket status send: " + handler.Connected);
                allDone.Set();
                //handler.Shutdown(SocketShutdown.Both);
                //handler.Close();
                log("Socket status send2: " + handler.Connected);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }

        public static int Main(String[] args)
        {
            StartListening();
            return 0;
        }

        public  static void log(string strLog)
        {
            StreamWriter log;
            FileStream fileStream = null;
            DirectoryInfo logDirInfo = null;
            FileInfo logFileInfo;

            string logFilePath = "C:\\Logs\\";
            logFilePath = logFilePath + "LogServer-" + System.DateTime.Today.ToString("MM-dd-yyyy") + "." + "txt";
            logFileInfo = new FileInfo(logFilePath);
            logDirInfo = new DirectoryInfo(logFileInfo.DirectoryName);
            if (!logDirInfo.Exists) logDirInfo.Create();
            if (!logFileInfo.Exists)
            {
                fileStream = logFileInfo.Create();
            }
            else
            {
                fileStream = new FileStream(logFilePath, FileMode.Append);
            }
            log = new StreamWriter(fileStream);
            log.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + ": " + strLog);
            log.Close();
        }
    }
}

And client one as Desktop Application:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
//using System.Text;
using System.IO;

namespace Asynch_client_form_2
{
   
    public partial class Form1 : Form
    {
        // The port number for the remote device.  
        private const int port = 11000;

        // ManualResetEvent instances signal completion.  
        private static ManualResetEvent connectDone =
            new ManualResetEvent(false);
        private static ManualResetEvent sendDone =
            new ManualResetEvent(false);
        private static ManualResetEvent receiveDone =
            new ManualResetEvent(false);

        // The response from the remote device.  
        private static String response = String.Empty;
        private static Socket client;

        private void ConnectBtn_Click(object sender, EventArgs e)
        {
            try
            {
                // Establish the remote endpoint for the socket.  
                // The name of the
                // remote device is "host.contoso.com".  
                IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
                IPAddress ipAddress = ipHostInfo.AddressList[0];
                IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);

                // Create a TCP/IP socket.  
                //Socket client = new Socket(ipAddress.AddressFamily,
                //    SocketType.Stream, ProtocolType.Tcp);

                client = new Socket(ipAddress.AddressFamily,
                   SocketType.Stream, ProtocolType.Tcp);

                // Connect to the remote endpoint.  
                client.BeginConnect(remoteEP,
                    new AsyncCallback(ConnectCallback), client);
                connectDone.WaitOne();
/*
                // Send test data to the remote device.  
                Send(client, "This is a test<EOF>");
                sendDone.WaitOne();

                // Receive the response from the remote device.  
                Receive(client);
                receiveDone.WaitOne();
                MsgTextBox.Text = response;*/
            }
            catch (Exception ex)
            {
                ExceptionTextBox.Text = ex.Message;
            }
        }
        private void SendBtn_Click(object sender, EventArgs e)
        {
            try
            { 
            // Send test data to the remote device.  
             //Send(client, MsgTextBox.Text );
                Send(client, "MY message");
                sendDone.WaitOne();

            // Receive the response from the remote device.  
            Receive(client);
            // receiveDone.WaitOne();
            MsgTextBox.Text = response;
            }
            catch (Exception ex)
            {
                ExceptionTextBox.Text = ex.Message;
            }
        }
        private static void ConnectCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete the connection.  
                client.EndConnect(ar);

                /* Console.WriteLine("Socket connected to {0}",
                     client.RemoteEndPoint.ToString());*/

                // Signal that the connection has been made.  
                connectDone.Set();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }
        private void DisConnectBtn_Click(object sender, EventArgs e)
        {
            // Release the socket.  
            client.Shutdown(SocketShutdown.Both);
            client.Close();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        public Form1()
        {
            InitializeComponent();
        }
        private static void Receive(Socket client)
        {
            try
            {
                // Create the state object.  
                StateObject state = new StateObject();
                state.workSocket = client;

                // Begin receiving the data from the remote device.  
                client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                    new AsyncCallback(ReceiveCallback), state);
            }
            catch (Exception e)
            {
              log(e.ToString());
            }
        }

        private static void ReceiveCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the state object and the client socket
                // from the asynchronous state object.  
                StateObject state = (StateObject)ar.AsyncState;
                Socket client = state.workSocket;

                // Read data from the remote device.  
                int bytesRead = client.EndReceive(ar);

                if (bytesRead > 0)
                {
                    // There might be more data, so store the data received so far.  
                    state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

                    // Get the rest of the data.  
                    client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                        new AsyncCallback(ReceiveCallback), state);
                }
                else
                {
                    // All the data has arrived; put it in response.  
                    if (state.sb.Length > 1)
                    {
                        response = state.sb.ToString();
                        log("Reply : " + response);
                    }
                    // Signal that all bytes have been received.  
                    receiveDone.Set();
                }
            }
            catch (Exception e)
            {
               log(e.ToString());
            }
        }

        private static void Send(Socket client, String data)
        {
            // Convert the string data to byte data using ASCII encoding.  
            byte[] byteData = Encoding.ASCII.GetBytes(data);

            // Begin sending the data to the remote device.  
            client.BeginSend(byteData, 0, byteData.Length, 0,
                new AsyncCallback(SendCallback), client);
        }

        private static void SendCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete sending the data to the remote device.  
                int bytesSent = client.EndSend(ar);
               // Console.WriteLine("Sent {0} bytes to server.", bytesSent);

                // Signal that all bytes have been sent.  
                sendDone.Set();
            }
            catch (Exception e)
            {
               log (e.ToString());
            }
        }
        public static void log(string strLog)
        {
            StreamWriter log;
            FileStream fileStream = null;
            DirectoryInfo logDirInfo = null;
            FileInfo logFileInfo;

            string logFilePath = "C:\\Logs\\";
            logFilePath = logFilePath + "LogClient-" + System.DateTime.Today.ToString("MM-dd-yyyy") + "." + "txt";
            logFileInfo = new FileInfo(logFilePath);
            logDirInfo = new DirectoryInfo(logFileInfo.DirectoryName);
            if (!logDirInfo.Exists) logDirInfo.Create();
            if (!logFileInfo.Exists)
            {
                fileStream = logFileInfo.Create();
            }
            else
            {
                fileStream = new FileStream(logFilePath, FileMode.Append);
            }
            log = new StreamWriter(fileStream);
            log.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + ": " + strLog);
            log.Close();
        }
    }
}

In Client i need to press connect in order to estabish socket
and after that press send bouton to send messages without disconnecting socket.
with this code i couldn't handle reply for my message from server.
Can someone help me please

Saving usercontrol design-time properties

Crazy Joe Devola13-Apr-20 14:49

Crazy Joe Devola

13-Apr-20 14:49

I swear I have been searching for an answer for hours but could not find any understandable example or article Frown | :-(

How do I make a property of a Winform usercontrol retain it's design time value? I added a new UserControl object. I put a label on the control. Added a property called "KeyText". I saw in few articles the attribute "DesignerSerailizationVisibility" mentioned so I added it as well.

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public string KeyText
{
    get { return label1.Text; }
    set
    {
        label1.Text = value;
    }
}

In the control, the default value of label1.Text is "X".

Then I added the control to a form. The property "KeyText" showed as one of the properties of the control. Great. So I changed it to "A". The design-time form showed A". Great. I compiled and ran the program - the control on the form showed "X" instead of "A".

What do I need to change to make the property persisteable? In VB6 I use something called PropBag to save and read design time properties.

Re: Saving usercontrol design-time properties

OriginalGriff13-Apr-20 20:00

OriginalGriff

13-Apr-20 20:00

OK, I added a new UserControl (called MyControl) to my project, dropped a label on it called MyLabel.
I changed it's Text property to "Default".
I added a string property called LabelText to the control:

public string LabelText
    {
    get
        {
        return MyLabel.Text;
        }
    set
        {
        MyLabel.Text = value;
        }
    }

And compiled the app.
Then I dropped two instances of MyControl (MC1 and MC2) onto my form.
I changed the LabelText property of MC2 to "Revised" in the designer and ran the app.
MC1 had "Default", MC2 had "Revised"

So what did I do that you didn't?

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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modified 14-Apr-20 2:40am.

Re: Saving usercontrol design-time properties

Richard Deeming14-Apr-20 0:13

Richard Deeming

14-Apr-20 0:13

Crazy Joe Devola wrote:
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]

That line is the problem. The documentation isn't particularly clear, but:

DesignerSerializationVisibilityAttribute Class (System.ComponentModel) | Microsoft Docs[^]
With the DesignerSerializationVisibilityAttribute, you can indicate whether the value for a property is Visible, and should be persisted in initialization code, Hidden, and should not be persisted in initialization code, or consists of Content, which should have initialization code generated for each public, not hidden property of the object assigned to the property.

The property value is a String. The String type doesn't have any public properties which can be set, so no initialization code will be generated.

Either set it to DesignerSerializationVisibility.Visible, or remove the attribute.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Saving usercontrol design-time properties

Crazy Joe Devola14-Apr-20 13:45

Crazy Joe Devola

14-Apr-20 13:45

thank you. It is working now.

Print Multiple Page in c#

Mohamed Fahad13-Apr-20 9:08

Mohamed Fahad

13-Apr-20 9:08

When i give print on first time it works , but when we click again it over printing

my print document code below

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            e.HasMorePages = false;
            gf = e.Graphics;  
            lsx = 10;
            lex = 797;
            Brush brblack = new SolidBrush(Color.Black);
            Pen p1 = new Pen(brblack);            
            int lpx = 10;
            //e.HasMorePages = false;
            if (pgcount < 2)
            {
                dgline = 370;
                dgtxt = 390;
                dgdc = 350;
                lsy1 = 345;
                e.Graphics.DrawImage(img, -10, 0);//header
                e.Graphics.DrawImage(img1, -10, 1000);//footer

                //Quotation
                e.Graphics.DrawString(txtdate.Text, new Font("Times New Roman", 12, FontStyle.Bold), Brushes.Green, 600, 135);//x,y
                e.Graphics.DrawString("Ref :" + txtqtnno.Text, new Font("Times New Roman", 12, FontStyle.Bold), Brushes.Black, 600, 155);
                e.Graphics.DrawString("M/S " + txtclientname.Text, new Font("Times New Roman", 12, FontStyle.Regular), Brushes.Black, lpx, 170);
                e.Graphics.DrawString(companyadd1, new Font("Times New Roman", 12, FontStyle.Regular), Brushes.Black, lpx, 195);
                e.Graphics.DrawString(companyadd2, new Font("Times New Roman", 12, FontStyle.Regular), Brushes.Black, lpx, 220);
                e.Graphics.DrawString("Kind Attn: " + cusname + "\nMob: " + cusno + ", E-mail: " + cusemail, new Font("Times New Roman", 12, FontStyle.Regular), Brushes.Black, lpx, 245);

                e.Graphics.DrawString("Dear Sir,", new Font("Times New Roman", 12, FontStyle.Regular), Brushes.Green, lpx, 295);//x,y
                e.Graphics.DrawString("sub : " + qtnsubject, new Font("Times New Roman", 12, FontStyle.Regular), Brushes.Green, lpx, 320);//x,y
            }
            else
            {
                lsy1 = 135;
                dgline = 155;
                dgtxt = 175;
                dgdc = 137;
            }
                e.Graphics.DrawLine(p1, new Point(lsx, lsy1), new Point(lex, lsy1));
                e.Graphics.DrawString("   Sr. no\t\t        Descrption\t\t\tPrice\t              Qty\t              Amount", new Font("Times New Roman", 12, FontStyle.Bold), Brushes.Green, lpx, dgdc);//x,y
                e.Graphics.DrawLine(p1, new Point(lsx, dgline), new Point(lex, dgline));

            
            for (;drc<dataGridView2.RowCount - 1; drc++)
            {
                SizeF sf = gf.MeasureString(dataGridView2.Rows[drc].Cells[1].Value.ToString(), new Font(new FontFamily("Times New Roman"), 12F), 200);
                rowspace = Convert.ToInt32(sf.Height);
                dgtxt = dgtxt + 10;
                chkpghgt = ((rowspace + dgtxt)*1);

                if (chkpghgt > 1000)
                {
                    e.HasMorePages = true;
                    pgcount++;
                    break;
                }

                gf.DrawString((drc+1).ToString(), new Font(new FontFamily("Times New Roman"), 12F), Brushes.Black, new RectangleF(new Point(50, dgtxt), sf), StringFormat.GenericTypographic);//sr.no
                gf.DrawString(dataGridView2.Rows[drc].Cells[1].Value.ToString(), new Font(new FontFamily("Times New Roman"), 12F), Brushes.Black, new RectangleF(new Point(120, dgtxt), sf), StringFormat.GenericTypographic);//description
                gf.DrawString(dataGridView2.Rows[drc].Cells[3].Value.ToString(), new Font(new FontFamily("Times New Roman"), 12F), Brushes.Black, new RectangleF(new Point(405, dgtxt), sf), StringFormat.GenericTypographic);//perprice
                gf.DrawString(dataGridView2.Rows[drc].Cells[4].Value.ToString(), new Font(new FontFamily("Times New Roman"), 12F), Brushes.Black, new RectangleF(new Point(550, dgtxt), sf), StringFormat.GenericTypographic);//Qty
                gf.DrawString(dataGridView2.Rows[drc].Cells[5].Value.ToString(), new Font(new FontFamily("Times New Roman"), 12F), Brushes.Black, new RectangleF(new Point(690, dgtxt), sf), StringFormat.GenericTypographic);//Amount
                dgline = dgtxt + rowspace + 10;
                e.Graphics.DrawLine(p1, new Point(lsx, dgline), new Point(lex, dgline));
                dgtxt = dgline;               
            }
            //Draw Vertical line
            e.Graphics.DrawLine(p1, new Point(lsx, lsy1), new Point(lsx, dgline));
            e.Graphics.DrawLine(p1, new Point(lsx+80, lsy1), new Point(lsx+80, dgline));
            e.Graphics.DrawLine(p1, new Point(370, lsy1), new Point(370, dgline));
            e.Graphics.DrawLine(p1, new Point(485, lsy1), new Point(485, dgline));
            e.Graphics.DrawLine(p1, new Point(625, lsy1), new Point(625, dgline));
            e.Graphics.DrawLine(p1, new Point(lex, lsy1), new Point(lex, dgline));
        }

Re: Print Multiple Page in c#

Pete O'Hanlon13-Apr-20 9:30

Pete O'Hanlon

13-Apr-20 9:30

You have an awful lot of objects there that should be disposed of. GDI resources are finite so every time you hit the event handler you are consuming resources without freeing them up. For instance, when you instantiate a Font, that's disposable so you should Dispose it.

Advanced TypeScript Programming Projects

Multi threading in c#

User-862169513-Apr-20 1:49

User-8621695

13-Apr-20 1:49

At few places I am reading that multi threading is a process in which we run multiple threads under a process. But at few places I can see that multi threading is a process of executing multiple threads. Like Working on word and listening music from different application. As they both are having different process like word.exe and vlc.exe.
So what should be correct way so say about multi threading?

Re: Multi threading in c#

OriginalGriff13-Apr-20 3:00

OriginalGriff

13-Apr-20 3:00

Multi-threading in the context of writing an app is the system of splitting work into multiple threads within a single process (the app execution space) to either free one thread (normally the GUI thread) of work, or to process data in parallel for higher throughput.
In this context, there is one process, which consists of memory plus a number of threads (which may change at run time)

The "working on word and listening to music" isn't really multi-threading - it's multi-process as the threads do not share a common execution space, and cannot access each other's memory. It's closer to the concept of "multitasking^*" than "multi-threading", although it does involve separate threads as each process must have at least one active thread in order to remain in existence.

* Multitasking in the sense that "women are supposed to be better at it than men" but actually there isn't a difference

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OPC Client Using C# Titanium Library

Member 147907399-Apr-20 20:17

Member 14790739

9-Apr-20 20:17

Hello Sir, I am trying to Read Tag (Value & Timestamp) from Mitsubishi MX OPC using C# Titatanium Library and insert those values in MySQL Database . Is that right way of proceeding for Reading value from OPC Server, Is there any Restriction in using Titanium Library. Please suggest a solution if any alternate Library to Read Value from OPC Server.

Regards,
Praveen cp

Re: OPC Client Using C# Titanium Library

Gerry Schmitz10-Apr-20 6:46

Gerry Schmitz

10-Apr-20 6:46

If it works, it works. Your experience is not dependent on someone else's experience.

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food

Re: OPC Client Using C# Titanium Library

Member 1479073910-Apr-20 7:03

Member 14790739

10-Apr-20 7:03

If it works, it works. Your experience is not dependent on someone else's experience.

Hello Sir, I really don't know what you are mentioning about. Just I asked that is there Limitations or Restriction using Titanium Library?

Re: OPC Client Using C# Titanium Library

Mycroft Holmes10-Apr-20 12:35

Mycroft Holmes

10-Apr-20 12:35

What is OPC?
What is Titanium Library?
Have you read the doco on both (if it exists)?

Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP

Re: OPC Client Using C# Titanium Library

Pete O'Hanlon14-Apr-20 5:42

Pete O'Hanlon

14-Apr-20 5:42

That's partly going to depend on what version of OPC DA the Mitsubishi MX uses (assuming you are confining yourself to the DA here and aren't interested in AE at all). All your other questions really flow from this.

Advanced TypeScript Programming Projects

textbox update

_Q12_9-Apr-20 19:19

_Q12_

9-Apr-20 19:19

Inside a textbox i add many lines of data, ended with a newline(\r\n) for each of it.
For example:
Aaa
Bbb
Ccc
Each line must be read in a backgroundWorker1_DoWork event. Basically, is a time delay of a couple of seconds between jumping to the other line to be read and processed.

My problem is this: - If i add a new line, WHILE the DoWork is running, the textbox.List.lenght is bigger by 1. What should LOAD that updated List, and pass the next line consecutively, to the worker?
At this point i am blank.

What i did so far...
I inverted the list
why? because my processing is not disturbed by each new line added on top, but is accumulating lines at the end, maintaining the lines numbers and contents when it jumps to the next line.

list1.Clear(); label1.Text = "";
list1.AddRange(textBox1.Lines);
list1.Reverse();
for (int i = 0; i < list1.Count; i++)
{
    label1.Text += list1[i] + nl;
}

And now the output is:
Ccc
Bbb-updateLine
Aaa
a1-nl
a2-nl

One solution to updating lines by mistake, and avoid re-processing them, is to completely erase the completed "worked" lines from the List and update somewhere else the finished lines.

Re: textbox update

_Q12_9-Apr-20 21:20

_Q12_

9-Apr-20 21:20

i figure out the solution, but i'm still curious whats your resolve though.

Re: textbox update

Gerry Schmitz10-Apr-20 6:43

Gerry Schmitz

10-Apr-20 6:43

Set up a separate "concurrent queue" for the background worker to access "new lines".

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food

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