C# Discussion Boards - CodeProject

Re: How can i detect if a path is valid.

Saksida Bojan14-Aug-09 5:05

Saksida Bojan

14-Aug-09 5:05

thanks, at least some provblems are solved.

C# and JavaScript. [modified]

Evgeni5714-Aug-09 3:34

Evgeni57

14-Aug-09 3:34

Hi all,

Sometime ago I wrote some automation tool to get content of some site.
Everything worked fine untill one day...

My C# code creted url string and made http hit. I used HttpRequest and Response.
Request looked like http://somesite.con/param1=a&param2=b&param3=c
Now, there was a change in the site and it always makes redirect to the url that looks like:
http://somesite.con/param1=a&param2=b&param3=c&rnd=AbCdEfG1.
With the fiddler I saw that actially web browser makes 2 hits:
1. The old one.
2. The new one.
Now the response of the first hit contains some JS code that generates this random code (AbCdEfG1), concatinates it to the main url and makes redirect.

As far as I understand I need to execute this JS from C#. It's may be done in the several ways and seems not too complex to do.
But then I need to or:
a. get back this random value from JS.
b. allow to JS to make redirection, but need to get back the response.
I prefer the b. because code that generates this random value always different (code generation or something).

The code of JS is something like that:

html>
    <head>
        <title></title>
    </head>


    <script type="text/javascript">
        function redirect()
        {
            var redirectLoc = window.location.href;
            if (redirectLoc.indexOf ('?')>-1) redirectLoc +="&"; else redirectLoc+="?";
            redirectLoc = redirectLoc.replace (/rnd=[0-9a-zA-Z]+&/,"");
            window.location = redirectLoc+'rnd='+f1();
        }
    </script>
<script type="text/javascript">
					function sbbpWvum()
					{
						nCc = typeof "zCa";
						return String.fromCharCode(nCc.charCodeAt(4)^37);
					}
function f1()
					{
						return sbbpWvum();
					}

Any one can help with this isue?
Thanks.

modified on Friday, August 14, 2009 10:04 AM

Re: C# and JavaScript.

Evgeni5717-Aug-09 1:41

Evgeni57

17-Aug-09 1:41

Still no ideas Smile | :)

Logging

Saksida Bojan14-Aug-09 3:02

Saksida Bojan

14-Aug-09 3:02

What is best solution for logging app data when crashed.

Is it possible to log data into xml or other formats a unhandled expections, where the data woud specify file, line and possibly a dump

Re: Logging

0x3c014-Aug-09 3:20

0x3c0

14-Aug-09 3:20

If you use Vista, then you can use its Application Recovery to recover from a crash. There's an article on CP for it here: Vista Application Crash Recovery in C#[^]

If you're going to save data, then I would make it as simple as possible. If you've got the Exception object, then the stack trace, exception type name and exception message would be a good start. You'd also want to get that for the InnerException, if it's not null. For the purposes of error logging, I'd just serialisation. It's still easily emailable, can be saved into XML format, and will have the data you need. And there's very little which can go wrong with it, so you're highly unlikely to get an exception, which would trigger the exception handler, which would raise an exception, which would trigger the exception handler ad infinitum.

Obviously if your application handles secure data, then you've got to save it in encrypted format. This can still use serialisation; you just need to save it to a CryptoStream instead of a FileStream

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

Access OleDb on x64

V.14-Aug-09 2:43

14-Aug-09 2:43

all,

I had an application that could access an mdb file via OleDb (Provider=Microsoft.Jet.OLEDB.4.0).
I received a new machine now, which is an x64 and it stopped working. It only works if I open up the solution and press F5 (doesn't matter if it is release or debug). So I did some searching and changed the provider (Provider=Microsoft.ACE.OLEDB.12.0) which works the same as above and also used a target x86 platform to build the application (I read x64 wasn't supported). Same behaviour. double clicking the exe fails to open the database, pressing F5 works without problems.

Here's the error:

Error: Could not connect to database: Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\vmalisse\Desktop\astrid_v21_result.mdb;User Id=admin;Password=;.<br />
error: The type initializer for 'System.Transactions.Diagnostics.DiagnosticTrace' threw an exception.

Can anyone point me to the problem? I'm not quite sure what exactly is wrong.

thanks.

V.

Stop smoking so you can: Enjoy longer the money you save.
Moviereview Archive

Re: Access OleDb on x64

Hristo-Bojilov14-Aug-09 22:20

Hristo-Bojilov

14-Aug-09 22:20

According to MSDN forums your app might have configuration problem.

Life is a stage and we are all actors!

Re: Access OleDb on x64

V.17-Aug-09 23:43

17-Aug-09 23:43

Thank you very much for the reply, apparently as you said, there is a configuration problem. I needed to ADD an App.config to my application. It's empty, but that did the trick.

V.

Stop smoking so you can: Enjoy longer the money you save.
Moviereview Archive

log4net doesn't log in myProcess.OutputDataReceived

buchstaben14-Aug-09 1:53

buchstaben

14-Aug-09 1:53

Hi,

my app logs correctly while code is beeing executed within my method DoIt. But it doesn't log in the Process.OutputDataReceived's EventHandler even if p_OutputDataReceived is called.

Is there anything I need to look at while using Process?

private void DoIt(string arguments)
{
    _log.Fatal("TEST"); // DOES LOG
    Process p = new Process();
    p.StartInfo.FileName = @"D:\vssTOOLS\NetJobs\UpdateDealArchiveInstrSeq\UpdateCaller\bin\Debug\UpdateDealArchiveInstrSeq.exe";
    p.StartInfo.RedirectStandardError = true;
    p.StartInfo.RedirectStandardOutput = true;
    p.OutputDataReceived += new DataReceivedEventHandler(p_OutputDataReceived);
    p.ErrorDataReceived += new DataReceivedEventHandler(p_ErrorDataReceived);
    p.StartInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetAssembly(typeof(Caller)).Location);
    p.StartInfo.UseShellExecute = false;
    p.StartInfo.Arguments = arguments;
    p.Start();

    p.BeginOutputReadLine();
    p.BeginErrorReadLine();

    p.WaitForExit();

    //Synchronisieren
    do
    {
        System.Threading.Thread.Sleep(100);
    } while (!p.HasExited);

    if (p.ExitCode != 0)
    {
        // DOES LOG
        for (int i = 0; i < procOut.ToString().Length; i += 2000)
            _log.Info(procOut.ToString().Length > i + 2000 ? procOut.ToString().Substring(i, 2000) : procOut.ToString().Substring(i));
        for (int i = 0; i < procErr.ToString().Length; i += 2000)
            _log.Error(procErr.ToString().Length > i + 2000 ? procErr.ToString().Substring(i, 2000) : procErr.ToString().Substring(i));
        throw new ApplicationException("Es ist ein Fehler aufgetreten: " + procErr.ToString());
    }
}

StringBuilder procOut = new StringBuilder();
StringBuilder procErr = new StringBuilder();
void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)
{
    procErr.AppendLine(e.Data);
    _log.Error(e.Data); // DOES NOT LOG
}

void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    procOut.AppendLine(e.Data);
    _log.Info(e.Data); // DOES NOT LOG
}

SqlDataReader-Ouput Parameter And SqlConnection

Nagaraj Muthuchamy14-Aug-09 1:12

Nagaraj Muthuchamy

14-Aug-09 1:12

Hi,

I am using a procedure which selects some rows and handles a output parameter.

I am executing this procedure using SqlDataReader.

Problem Is ,

If Connection is kept open after ExecuteReader(), Sql Reader is working fine and able to do data binding. But, output parameter is returing null value.

If Connection is closed, I am able to get the correct output parameter value. But, SqlDataReader is not working.

Any Ideas to make both working regardless of connection status.

Thanks,
Nagaraj

Umbraco Developer

Re: SqlDataReader-Ouput Parameter And SqlConnection

Ashfield14-Aug-09 1:17

Ashfield

14-Aug-09 1:17

You can't. You only get the ouput parameter back when you close the connection. Its always been that way.

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Re: SqlDataReader-Ouput Parameter And SqlConnection

Nagaraj Muthuchamy14-Aug-09 1:25

Nagaraj Muthuchamy

14-Aug-09 1:25

Thanks Bob,

My code is fetching the records for GridView Binding (for the selected PageIndex) and total results in single call to database.

I am returing SqlReader from DAC to BusinessLayer and to Code file from there.

Is there any better way to achive this?

Thanks again
Nagaraj

Umbraco Developer

Re: SqlDataReader-Ouput Parameter And SqlConnection

Coding C#14-Aug-09 1:29

Coding C#

14-Aug-09 1:29

DataReader needs open connection.

Better you use DataSet, DataAdapter.

Coding C#
www.excitetemplate.com

Re: SqlDataReader-Ouput Parameter And SqlConnection

Ashfield14-Aug-09 2:57

Ashfield

14-Aug-09 2:57

You could use a dataset and fill that, I think you would then get your output parameter straight away - not 100% sure though, I haven't tried it. Alternatively, return 2 recordsets and use a dataadaptor to fill a dataset, you then should get what would have been the output param in its own table.

Hope some of this helps

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Re: SqlDataReader-Ouput Parameter And SqlConnection

Pete O'Hanlon14-Aug-09 3:01

Pete O'Hanlon

14-Aug-09 3:01

Ashfield wrote:
think you would then get your output parameter straight away

Unfortunately not - you have to iterate over the lot before you get the output parameter back. This has caused me grief a few times.

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As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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Re: SqlDataReader-Ouput Parameter And SqlConnection

Ashfield14-Aug-09 5:05

Ashfield

14-Aug-09 5:05

Pete O'Hanlon wrote:
Unfortunately not - you have to iterate over the lot before you get the output parameter back

Ought to have guessed that really. Blush | :O

I never tried it, I generally don't bother with output parameters simply because you can't get them when you really want them, usually first! If I need something like that I often return 2 record sets, the 1st with what would be the output parameter and the 2nd with the real data - probably not ideal, but it works for me Smile | :)

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Disabling a button on one form from another.

False Chicken14-Aug-09 0:28

False Chicken

14-Aug-09 0:28

I have this button that I want disabled from a check box on a separate form. Its an options window and one option is to disable a certain button but the button is on the previous from. How can i disable the button from the form? I cant just start typing because it does not know the button exists. due to it being on another form.

Y*Live Long And Prosper*Y

Re: Disabling a button on one form from another.

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)

Re: Disabling a button on one form from another.

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.

Re: Disabling a button on one form from another.

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

Re: Disabling a button on one form from another.

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 | :)

Re: Disabling a button on one form from another.

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

Re: Disabling a button on one form from another.

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;
    }
}

Re: Disabling a button on one form from another.

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.

DelegateSerializationHolder is not permitted to be deserialized at this security level

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".

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