Re: Disabling a button on one form from another. - C# Discussion Boards

DaveyM6914-Aug-09 0:53

DaveyM69

14-Aug-09 0:53

Raise an event in the form with the checkbox that the form with the button subscribes to.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

DaveyM6914-Aug-09 1:00

DaveyM69

14-Aug-09 1:00

You might want to delete the repost you made above this one before you get flamed for it! I think the CP servers had a bit of a fit a few minutes ago, so probably when you thought it hadn't submitted - it actually had.

False Chicken14-Aug-09 1:06

False Chicken

14-Aug-09 1:06

yeah sorry lol I thought it didn't go through

Y*Live Long And Prosper*Y

Hristo-Bojilov14-Aug-09 1:08

Hristo-Bojilov

14-Aug-09 1:08

You could do it using events or delegates or custom WM messages Smile | :)

False Chicken14-Aug-09 1:15

False Chicken

14-Aug-09 1:15

Can someone please be more specific? Im new to programming.

Y*Live Long And Prosper*Y

DaveyM6914-Aug-09 1:39

DaveyM69

14-Aug-09 1:39

Working Example:

// FormButton.cs
using System;
using System.Windows.Forms;

public partial class FormButton : Form
{
    public FormButton()
    {
        InitializeComponent();
    }

    private void FormButton_Load(object sender, EventArgs e)
    {
        FormCheckBox formCheckBox = new FormCheckBox();
        formCheckBox.CheckStateChanged += formCheckBox_CheckStateChanged;
        formCheckBox.Show();
    }

    void formCheckBox_CheckStateChanged(object sender, CheckStateEventArgs e)
    {
        button1.Enabled = e.IsChecked;
    }
}

// FormCheckBox.cs
using System;
using System.Windows.Forms;

public partial class FormCheckBox : Form
{
    public event EventHandler<CheckStateEventArgs> CheckStateChanged;
    public FormCheckBox()
    {
        InitializeComponent();
    }

    private void checkBox1_CheckStateChanged(object sender, EventArgs e)
    {
        OnCheckStateChanged(new CheckStateEventArgs(checkBox1.Checked));
    }

    protected virtual void OnCheckStateChanged(CheckStateEventArgs e)
    {
        EventHandler<CheckStateEventArgs> eh = CheckStateChanged;
        if (eh != null)
            eh(this, e);
    }
}

// CheckStateEventArgs.cs
public class CheckStateEventArgs : EventArgs
{
    public CheckStateEventArgs(bool isChecked)
    {
        IsChecked = isChecked;
    }
    public bool IsChecked
    {
        get;
        private set;
    }
}

DelegateSerializationHolder is not permitted to be deserialized at this security level

Hristo-Bojilov14-Aug-09 2:01

Hristo-Bojilov

14-Aug-09 2:01

I've already read that DaveyM69 has explained to you how to use events/delegates for solving your problem.But sometimes you need to notify other instances of your app for something important.In this case events and delegates are not useful,because you can't get valid pointers of the forms belonging to another instance of the app.In this case you have to use custom WM messages.To register custom WM message call RegisterWindowMessage native function.
And to send message call SendMessage native function passing HWND_BROADCAST value for hWnd parameter.But this function doesn't seem to work with child windows,but it works with hidden top windows for example.
But be careful with that option-it could damage OS performance.

Nigel Mackay14-Aug-09 0:08

Nigel Mackay

14-Aug-09 0:08

I'm not sure how much code you need to see to handle this problem.
I am trying to add the ability for any logged-on client to send a message to all other logged-on clients.
My server code looks like this:

public OedipusServer
{
   // Register our tcp channel
   bool ensureSecurity = true;
   RemotingConfiguration.Configure("oedipus.exe.config", ensureSecurity);
   
   UserList insUserList = UserList.Instance;
   ObjRef refUserList = RemotingServices.Marshal(insUserList, "UserList");
   ...  //  More classes instanced here
   ServerClass insServerClass = ServerClass.Instance;
   ObjRef refAServerClass = RemotingServices.Marshal(insServerClass, "Messaging");
}
public class ServerClass : AbstractServer
{
   private static ServerClass mInstance = null;
   public static ServerClass Instance
   {
      get
      {
         if (mInstance == null)
            mInstance = new ServerClass();
         return mInstance;
      }
   }
   public override Object InitializeLifetimeService()
   {
      return null;
   }
   public override void myStatusHasChanged(int userID, int newStatus)
   {
      FireNewBroadcastedMessageEvent(userID, newStatus);
   }
   public event StatusChangedEventHandler myStatusChangedHandler;
   public override event StatusChangedEventHandler myStatusChangedEvent
   {
     add
     {
        myStatusChangedHandler = value;
     }
     remove
     {
     }
   }
   protected void FireNewBroadcastedMessageEvent(int userID, int newStatus)
   {
      myStatusChangedHandler(userID, newStatus);
   }
}

I have another project, Messaging, which looks like this:

public delegate void StatusChangedEventHandler(int userID, int newStatus);
public abstract class AbstractServer : MarshalByRefObject
{
   public abstract void myStatusHasChanged(int userID, int newStatus);
   public abstract event StatusChangedEventHandler myStatusChangedEvent;
}
public abstract class AbstractBroadcastedMessageEventSink : MarshalByRefObject
{
   public void callbackStatusChanged(int userID, int newStatus)
   {
      internalCallbackStatusChanged(userID, newStatus);
   }
   protected abstract void internalCallbackStatusChanged(int userID, int newStatus);
}

On the client side I have:

class EventSink : AbstractBroadcastedMessageEventSink
{
   protected override void internalCallbackStatusChanged(int userID, int newStatus)
   {
      //  Handle event here
   }
}
private AbstractServer rmMessaging;
public Office()
{
   rmMessaging = (AbstractServer)Activator.GetObject
                 (typeof(AbstractServer),
                 System.Configuration.ConfigurationManager.AppSettings
                 ["AbstractServerUrl"]);
   EventSink sinkStatusChanged = new EventSink();
   //  Subscribe to event
   rmMessaging.myStatusChangedEvent += 
         new StatusChangedEventHandler(sinkStatusChanged.callbackStatusChanged);
}
private void button1_Click(object sender, EventArgs e)
{
   // Initiate the event
   rmMessaging.myStatusHasChanged(23, 14);
}

It's subscribing to the event which raises the runtime error "DelegateSerializationHolder is not permitted to be deserialized at this security level".

Re: DelegateSerializationHolder is not permitted to be deserialized at this security level

Hristo-Bojilov14-Aug-09 7:46

Hristo-Bojilov

14-Aug-09 7:46

It seems your remoting configuration is not correct.This stuff might help you to solve your the problem.

Re: DelegateSerializationHolder is not permitted to be deserialized at this security level

Nigel Mackay14-Aug-09 21:27

Nigel Mackay

14-Aug-09 21:27

Thanks. I found another article which discussed the problem and offered the solution of using a wrapper class. It still didn't work until I realised that I couldn't use tcp.

Adding a separate channel using http/Soap/Singleton (as your article states) solved the problem.

So I have a tcp channel for my data-access and an http channel for braodcasting messages.

'Mirror' ListView control

kanchoette13-Aug-09 23:48

kanchoette

13-Aug-09 23:48

At the risk of sparking of hilarious ridicule, can I get a ListView Control which mirrors the content of another?

I have a listview which is populated and another 'blank' (unitilialised) listview which I need to 'mirror' the first.

Any pointers welcomed.

Re: 'Mirror' ListView control

musefan14-Aug-09 2:33

musefan

14-Aug-09 2:33

Well what ever you do with the first one, just do it to the second one at the same time

Life goes very fast. Tomorrow, today is already yesterday.

Catching an Exception

stancrm13-Aug-09 23:47

stancrm

13-Aug-09 23:47

Hello. This is my problem:

try
{
  Application.Run(new Form1());
}
catch(Exception ex)
{
  MessageBox.Show(ex.Message);
}

In Debug-Mode (F5), if exception is thrown, then it goes to catch block.
In Release-Mode (Ctlr-F5), if exception is thrown, then it shows "unexpected exception" from windows. Catch block is not called.

How can I catch unexpected exception in Release-Mode ?

Thanks.

Re: Catching an Exception

Eddy Vluggen14-Aug-09 0:07

Eddy Vluggen

14-Aug-09 0:07

There's a special event that gets triggered whenever there's an unhandled exception. Your application could subscribe to the Application.ThreadException[^]-event.

Something like this (adapted from the MSDN-example, not tested);

{
// Add the event handler for handling UI thread exceptions to the event.
    Application.ThreadException += new ThreadExceptionEventHandler(MyErrorHandler);

// Set the unhandled exception mode to force all Windows Forms errors 
// to go through our handler.
    Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
    Application.Run(new Form1());
}

private static void MyErrorHandler(object sender, ThreadExceptionEventArgs t)
{
    ShowMessage(t.ToString());
}

I are Troll Smile | :)

Re: Catching an Exception

stancrm14-Aug-09 1:15

stancrm

14-Aug-09 1:15

Ok, thanks.

Close Firefox with C#

nhqlbaislwfiikqraqnm13-Aug-09 22:35

13-Aug-09 22:35

Hey!

How can i close Firefox?

Eddy Vluggen13-Aug-09 22:39

Eddy Vluggen

13-Aug-09 22:39

Enumerate all the processes using the GetProcesses method, and if you find FF, terminate it. Take a look at the Process[^]-class Smile | :)

I are Troll Smile | :)

Rajesh R Subramanian13-Aug-09 22:42

Rajesh R Subramanian

13-Aug-09 22:42

May I politely ask why do you want to close FF from your program? What kind of program are you writing?

It is a crappy thing, but it's life -^ Carlo Pallini

nhqlbaislwfiikqraqnm13-Aug-09 22:51

13-Aug-09 22:51

i want to make a Firefox Pw Viewer.
And for that i will close the FF before i open the Firefox Pw Viewer.

0x3c013-Aug-09 22:54

0x3c0

13-Aug-09 22:54

Firefox keeps a lock on the bookmarks database, and needs to be closed for some bookmark readers to work. I'm not certain, but I think that something similar would be in effect for the passwords database

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

nhqlbaislwfiikqraqnm13-Aug-09 22:59

13-Aug-09 22:59

I look for a code!
And then i will close the FF prozess

Eddy Vluggen13-Aug-09 23:14

Eddy Vluggen

13-Aug-09 23:14

PC17 wrote:
I look for a code!

Sorry for posting an answer instead of real code Big Grin | :-D

I are Troll Smile | :)

nhqlbaislwfiikqraqnm13-Aug-09 23:41