Moving value to textbox control from another thread - C# Discussion Boards

musefan20-Jan-09 1:55

musefan

20-Jan-09 1:55

simple. Just put your declarations and functions in your main class.

if you need access by multiple classes then use a static class as a kind of 'header' class

Dave Kreskowiak20-Jan-09 2:01

Dave Kreskowiak

20-Jan-09 2:01

There is no way to use those files. You simply have to rewrite the declarations in C# code in an appropriate place in your project.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Christian Graus20-Jan-09 2:12

Christian Graus

20-Jan-09 2:12

wit is not a word. And, it sounds like you need to learn C#. C# doesn't need headers, it auto includes everything.

Christian Graus

Driven to the arms of OSX by Vista.

#realJSOP20-Jan-09 2:26

#realJSOP

20-Jan-09 2:26

You couldn't figure that out on your own?

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Moving value to textbox control from another thread

PIEBALDconsult21-Jan-09 5:55

PIEBALDconsult

21-Jan-09 5:55

Simple; put an # include directive in your C# and run it through a C pre-processor.

The_Collector20-Jan-09 1:15

Re: Moving value to textbox control from another thread

20-Jan-09 1:15

Good Day Everybody....
i've been trying to move a value to a textbox control from another thread... I tried so many things but it doesn't work. Anybody who can help me, i really need it badly. Thnx n advance to kind people who r ready to share thier knowledge.

below are my coding:

-------------------
form1.cs
------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace webbrowser
{
public partial class WebBrowser : Form
{
public delegate void DisplayHandler(string stringMessage);
public event DisplayMessage;

public WebBrowser()
{
InitializeComponent();
}

private void WebBrowser_Load(object sender, EventArgs e)
{

Thread threadSocket = new Thread(new ThreadStart(StartSocket));
threadSocket.Start();
}

public static void StartSocket()
{
SocketServer mySocket = new SocketServer();
mySocket.SocketDataArrival += new SocketServer.SocketServerHandler(ShowDataArrival);
mySocket.InititateServer();
}

void DisplayMessage(string stringMessage)
{
TxtBoxMsg.Text = stringMessage;
}

static void ShowDataArrival(object a, SocketServerArgs e)
{
DisplayHandler d = new DisplayHandler();
d.Invoke(e.Message);
}

}
}

---------------------------
Class1.cs
-----------
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace webbrowser
{
public class SocketServer
{

public delegate void SocketServerHandler(object myObject, SocketServerArgs myArgs);

public event SocketServerHandler SocketDataArrival;

public void InititateServer()
{
StreamWriter streamWriter;
StreamReader streamReader;
NetworkStream networkStream;
TcpListener tcpListener = new TcpListener(8000);
tcpListener.Start();
Socket serverSocket = tcpListener.AcceptSocket();
try
{
if (serverSocket.Connected)
{
networkStream = new NetworkStream(serverSocket);
streamWriter = new StreamWriter(networkStream);
streamReader = new StreamReader(networkStream);
SocketServerArgs myArgs = new SocketServerArgs(streamReader.ReadLine());
SocketDataArrival(this, myArgs);
}
}
catch (SocketException ex)
{
Console.WriteLine(ex);
}
}
public SocketServer()
{
}
}

public class SocketServerArgs : EventArgs
{
private string message;

public SocketServerArgs(string message)
{
this.message = message;
}

public string Message
{
get
{
return message;
}
}
}

}

xxx

J a a n s20-Jan-09 1:20

J a a n s

20-Jan-09 1:20

Check the following links...
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.invokerequired.aspx[^]
http://msdn.microsoft.com/en-us/library/ms171728(VS.80).aspx[^]

*jaans

Re: Moving value to textbox control from another thread

The_Collector20-Jan-09 2:55

Re: Moving value to textbox control from another thread

20-Jan-09 2:55

thanks for your idea but I had tried the solutions recomended before and it still doesnt work...
1. the textbox control can't be seen in the calling class thread.
2. I incountered an error when i use a delegate & invoked method as advice by most of the experts.

xxx

musefan20-Jan-09 1:23

musefan

20-Jan-09 1:23

Dont know if is the best option but you can use a static property and then create an event handler that is fired when that property changes. i.e. thread sets property to required string

Then your text box can listen for the event and load the static property value as its text

Re: Moving value to textbox control from another thread

The_Collector20-Jan-09 2:50

Re: Moving value to textbox control from another thread

20-Jan-09 2:50

thanks for your idea but I had done it but it doesn't work.

xxx

Eddy Vluggen20-Jan-09 1:40

Re: Moving value to textbox control from another thread

20-Jan-09 1:40

"Synchronization in Threads

When we have multiple threads that share data, we need to provide synchronized access to the data. We have to deal with synchronization issues related to concurrent access to variables and objects accessible by multiple threads at the same time. This is controlled by giving one thread a chance to acquire a lock on the shared resource at a time. We can think it like a box where the object is available and only one thread can enter into and the other thread is waiting outside the box until the previous one comes out."

As quoted from a Code Project Article[^].

The_Collector wrote:
Thnx n advance to kind people who r ready to share thier knowledge

I ain't that kind Smile | :)

I are troll Smile | :)

The_Collector20-Jan-09 2:57

Re: Moving value to textbox control from another thread

20-Jan-09 2:57

Thank you again for ur quotes but it doesn't help me....

xxx

Eddy Vluggen20-Jan-09 3:14

Re: Moving value to textbox control from another thread

20-Jan-09 3:14

"A Textbox from another thread"?

Textboxes should be confined to the UI-thread Smile | :)

I are troll Smile | :)

The_Collector20-Jan-09 3:24

Re: Moving value to textbox control from another thread

20-Jan-09 3:24

i am attaching the complete codes on my post.... i don't know what to do anymore,,,, i'm stack.... tnx

xxx

The_Collector20-Jan-09 3:27

Re: Moving value to textbox control from another thread

20-Jan-09 3:27

i don't want to be spoonfeed but at this point, i really need a solution.... tnx again

xxx

Eddy Vluggen20-Jan-09 3:37

Re: Moving value to textbox control from another thread

20-Jan-09 3:37

I really need to stop smoking..

You were about to post code. I'll try to run your version on my machine tonight and see if I can find anything Smile | :)

I are troll Smile | :)

The_Collector20-Jan-09 3:41

Re: Moving value to textbox control from another thread

20-Jan-09 3:41

thanks a lot::::

below are my coding just to make sure Smile | :)

:

-------------------
form1.cs
------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace webbrowser
{
public partial class WebBrowser : Form
{
public delegate void DisplayHandler(string stringMessage);
public event DisplayMessage;

public WebBrowser()
{
InitializeComponent();
}

private void WebBrowser_Load(object sender, EventArgs e)
{

Thread threadSocket = new Thread(new ThreadStart(StartSocket));
threadSocket.Start();
}

public static void StartSocket()
{
SocketServer mySocket = new SocketServer();
mySocket.SocketDataArrival += new SocketServer.SocketServerHandler(ShowDataArrival);
mySocket.InititateServer();
}

void DisplayMessage(string stringMessage)
{
TxtBoxMsg.Text = stringMessage;
}

static void ShowDataArrival(object a, SocketServerArgs e)
{
DisplayHandler d = new DisplayHandler();
d.Invoke(e.Message);
}

}
}

---------------------------
Class1.cs
-----------
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace webbrowser
{
public class SocketServer
{

public delegate void SocketServerHandler(object myObject, SocketServerArgs myArgs);

public event SocketServerHandler SocketDataArrival;

public void InititateServer()
{
StreamWriter streamWriter;
StreamReader streamReader;
NetworkStream networkStream;
TcpListener tcpListener = new TcpListener(8000);
tcpListener.Start();
Socket serverSocket = tcpListener.AcceptSocket();
try
{
if (serverSocket.Connected)
{
networkStream = new NetworkStream(serverSocket);
streamWriter = new StreamWriter(networkStream);
streamReader = new StreamReader(networkStream);
SocketServerArgs myArgs = new SocketServerArgs(streamReader.ReadLine());
SocketDataArrival(this, myArgs);
}
}
catch (SocketException ex)
{
Console.WriteLine(ex);
}
}
public SocketServer()
{
}
}

public class SocketServerArgs : EventArgs
{
private string message;

public SocketServerArgs(string message)
{
this.message = message;
}

public string Message
{
get
{
return message;
}
}
}

}

xxx

Eddy Vluggen20-Jan-09 6:52

Re: Moving value to textbox control from another thread

20-Jan-09 6:52

using System;
using System.Windows.Forms;
using System.Threading;

namespace webbrowser
{
    public partial class WebBrowser : Form
    {
        public delegate void DisplayHandler(string stringMessage);
        //public event DisplayMessage;

        public WebBrowser()
        {
            InitializeComponent();
        }

        private Thread threadSocket;
        private SocketServer mySocket;

        private void WebBrowser_Load(object sender, EventArgs e)
        {

            threadSocket = new Thread(StartSocket);
            threadSocket.Start();
        }

        public void StartSocket()
        {
            mySocket = new SocketServer();
            mySocket.SocketDataArrival += ShowDataArrival;
            mySocket.InititateServer();
        }

        public void DisplayMessage(string stringMessage)
        {
            TxtBoxMsg.Text = stringMessage;
        }

        void ShowDataArrival(object a, SocketServerArgs e)
        {
            DisplayHandler d = DisplayMessage;
            d.Invoke(e.Message);
        }
    }
}

Something like this?

I are troll Smile | :)

The_Collector20-Jan-09 11:12

Re: Moving value to textbox control from another thread

20-Jan-09 11:12

hi, god day,,,
i tried to run your corrected code but it will still give the same error

"Cross-thread operation not valid: Control 'TxtBoxMsg' accessed from a thread other than the thread it was created on."

xxx

The_Collector20-Jan-09 11:55

Re: Moving value to textbox control from another thread

20-Jan-09 11:55

your suggested code did not run, however i still want to thank you for your effort done. your code really help a lot to solve my problem... I made a little adjustment on your corrected code....
again, thank you very much

using System;
using System.Windows.Forms;
using System.Threading;

namespace webbrowser
{
public partial class WebBrowser : Form
{
public delegate void DisplayHandler(string stringMessage);
//public event DisplayMessage;

public WebBrowser()
{
InitializeComponent();
}

private Thread threadSocket;
private SocketServer mySocket;
private void WebBrowser_Load(object sender, EventArgs e)
{
threadSocket = new Thread(StartSocket);
threadSocket.Start();
}

public void StartSocket()
{
mySocket = new SocketServer();
mySocket.SocketDataArrival += ShowDataArrival;
mySocket.InititateServer();
}

public void DisplayMessage(string stringMessage)
{
this.TxtBoxMsg.Text = stringMessage;

}

void ShowDataArrival(object a, SocketServerArgs e)
{
//DisplayHandler d = DisplayMessage;
//d.Invoke(e.Message);
DisplayHandler d = new DisplayHandler(DisplayMessage);
this.TxtBoxMsg.Invoke(d, new object[] { e.Message });
}
}
}

xxx

Eddy Vluggen20-Jan-09 21:33