Re: Updating console textbox from multiple threads - C# Discussion Boards

Re: silly question about access dba connection

CalvinHobbies16-Jun-11 21:15

CalvinHobbies

16-Jun-11 21:15

That's the one Big Grin | :-D

thanks for putting me out my misery.

/////////////////
Groucho Marx
Those are my principles, if you don't like them… I have others.

Re: silly question about access dba connection

Blue_Boy16-Jun-11 21:19

Blue_Boy

16-Jun-11 21:19

You are welcome. Smile | :)

I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.

www.cacttus.com

How to not lose focus in the parent form when opening a modeless form

manchukuo16-Jun-11 18:18

manchukuo

16-Jun-11 18:18

Hello!, well that is the question i remember fixing this in MFC returning a false in the initdialog method, but how to do this in C#? D'Oh! | :doh:

Re: How to not lose focus in the parent form when opening a modeless form

OriginalGriff16-Jun-11 22:33

OriginalGriff

16-Jun-11 22:33

Override ShowWithoutActivation in the non-modal form:

protected override bool ShowWithoutActivation
    {
    get { return true; }
    }

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Manfred R. Bihy: "Looks as if OP is learning resistant."

Re: How to not lose focus in the parent form when opening a modeless form

manchukuo17-Jun-11 6:13

manchukuo

17-Jun-11 6:13

This made the job, just some info for anyone else, using this with topmost property to true will not work, i think this is a bug on windows forms

Updating console textbox from multiple threads

shivamkalra16-Jun-11 14:58

shivamkalra

16-Jun-11 14:58

Hello everyone,

I've made a multithread data base application, which is collecting data from multiple data bases from different threads and then process it and notifies the result on GUI. I've made a console which is just a big text box. Now, my question is that what is the best way to update a single GUI component from multiple threads. So far, I've made class called class IOConsole which constains a variable called static Queue(String message) and a method public static println(string str) and then I've added a background worker in GUI thread which keep looping and checks if queque is empty or not and if not empty then it pop the string and print it on the GUI. To me its does't look very nice approach, not sure if it might be. But could I get some suggestion about how can I achieve this most efficiently.

Thanks,
Shivam Kalra Smile | :)

Re: Updating console textbox from multiple threads

manchukuo16-Jun-11 18:38

manchukuo

16-Jun-11 18:38

why not just use begininvoke or invoke? this is executed in the main thread always, or even using windows messages, or there is even invoke required way since .NET 2

the invoke way can be something like this, using anonymous method

///...code code code and more code in your worker thread

string nextText = "qwe"; 
this.Invoke( (MethodInvoker)delegate {
    oneLabel.Text = nextText; // runs on main thread
}
);

///...and goes more code in your worker thread

Re: Updating console textbox from multiple threads

BobJanova16-Jun-11 23:02

BobJanova

16-Jun-11 23:02

The right idea, but it's generally better to have the updater fire events and not be tightly linked in to the UI class. E.g.

class DatabaseUpdater {
 event EventHandler<UpdateEventArgs> Update;

 void ThreadMethod() {
  while(true){ 
   // ... check the db
   if(thereWasAnUpdate && Update != null){
    Update(this, new UpdateEventArgs(updatedTable, key, Value);
    // or whatever you want to be in your UpdateEventArgs
   }
  }
 }
}

class MainForm {
 List<DatabaseUpdater> updaters;
 MainForm(){
  // ...
  foreach(DatabaseUpdater updater in updaters)
   updater.Update += DatabaseUpdated;
 }

 void DatabaseUpdated(object sender, UpdateEventArgs e){
  this.Invoke((MethodInvoker) delegate { myTextBox.Text += e.UpdatedTable + "\n"; });
 }
}

Re: Updating console textbox from multiple threads

shivamkalra17-Jun-11 10:21

shivamkalra

17-Jun-11 10:21

Hi, thanks for the reply. Will this code make sure that even if I invoke it through multiple threads..may be 5 threads then will be able to print all 5 of them on the console text box? And if "yes" then could you put more light on how it does that? I thought code should have been more complicated but it looks just one sentence thing?

Help with c sharp and powershell exchange commands

turbosupramk316-Jun-11 10:58

turbosupramk3

16-Jun-11 10:58

I'm trying to use this example to return powershell exchange console commands. Has anyone been able to do that and if not with the code example below, can you provide an example please?

Asynchronously Execute PowerShell Scripts from C#[^]

Re: Help with c sharp and powershell exchange commands

turbosupramk316-Jun-11 11:47

turbosupramk3

16-Jun-11 11:47

As an update, I am able to run get-alias, but not run test-servicehealth. Would anyone know why the difference?

Re: Help with c sharp and powershell exchange commands

jschell16-Jun-11 12:07

jschell

16-Jun-11 12:07

You ran the example from that link as is, without modification, and it did not work?

Re: Help with c sharp and powershell exchange commands

turbosupramk316-Jun-11 13:20

turbosupramk3

16-Jun-11 13:20

Hi,

The example program will load. I then can type in a powershell command like "get-alias" and it will work, but when I use an exchange specific powershell command like "test-servicehealth" it will not work.

When I use the exchange management shell, it outputs a value, but as you can see the program referenced in the link returns what all c sharp tries at this have returned.

http://img32.imageshack.us/img32/3452/testserverhealth1.jpg[^]

http://img849.imageshack.us/img849/804/testserverhealth2.jpg[^]

Re: Help with c sharp and powershell exchange commands

turbosupramk317-Jun-11 7:51

turbosupramk3

17-Jun-11 7:51

I'm able to see the values by using the code below when I run through the debug step by step (in Visual Studio) and then I use the mouse to expand child items, but I cannot access the child items through code?

Has anyone ever experienced that before?

http://knicksmith.blogspot.com/2007/03/managing-exchange-2007-recipients-with.html[^]

Re: Help with c sharp and powershell exchange commands

jschell17-Jun-11 11:40

jschell

17-Jun-11 11:40

Then the real problem is that you want to do something more complicated and that the code given doesn't provide an exact solution.

I would suppose that there is a way to do it.
I would also suppose that it will require reading the documentation, experimenting and guessing to get to a solution. Similar to other programming tasks that one might encounter.

Re: Help with c sharp and powershell exchange commands

turbosupramk317-Jun-11 13:01

turbosupramk3

17-Jun-11 13:01

Hi,

Here is what I have, and so far this is working. It is far from finished and sorry for all of the comments, but I just got it working. It works for get-mailbox -identity first.last, it works for get-alias and it works for test-servicehealth. It itterates through everything, but it is a start Smile | :)

I'm sorry for the post length, I thought that codeblock would limit the screen usage and put a scrollable window within the post. If anyone knows how to do that, please let me know.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using exchangePowerShell;
using System.Security.Permissions;
using Microsoft.Win32;
using System.Net;
using System.IO;
using System.Diagnostics;
using System.Collections;
using System.Reflection;
using System.Collections.ObjectModel;
using System.Management.Automation; // Add reference to System.Management.Automation
using System.Management.Automation.Host;
using System.Management.Automation.Runspaces;

namespace TempTest1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //results = ems.RunspaceInvoke("Get-Mailbox bradley.wanzer");
            //results = ems.RunspaceInvoke("test-servicehealth -server ph-mb-05");

            //ICollection<PSObject> results2;
            //results2 = ems.RunspaceInvoke("test-servicehealth -server ph-mb-05").ToArray();

            //Command EMSCommand = new Command("test-servicehealth");

            //results = ems.RunspaceInvoke("test-servicehealth -server ph-mb-05");

            textBox1.Text = "";
            ExchangeManagementShellWrapper ems = ExchangeManagementShellWrapper.Instance;
            ICollection<PSObject> results;
            results = ems.RunspaceInvoke(textBox2.Text);
            try
            {
                foreach (PSObject item in results)
                {
                    List<string> propertyListTotal = new List<string>();
                    foreach (PSPropertyInfo itemSubProperty in item.Properties)
                    {
                        propertyListTotal.Add(itemSubProperty.ToString());
                    }

                    //List<string> propertyList2 = new List<string>();
                    foreach (string propertyListItem in propertyListTotal)
                    {
                        //string propertyL2 = propertyL.Substring(propertyL.IndexOf(" "));
                        //string propertyL3 = propertyL2.Remove(propertyL2.LastIndexOf(" "));
                        string propertyListItemTrimBack = propertyListItem.Remove(propertyListItem.LastIndexOf(" "));
                        string propertyListItemTrimFront = propertyListItemTrimBack.Substring(propertyListItemTrimBack.LastIndexOf(" "));

                        propertyListItemTrimFront = propertyListItemTrimFront.TrimStart(); // Trim any white space
                        propertyListItemTrimFront = propertyListItemTrimFront.TrimEnd(); // Trim any white space
                        PSPropertyInfo propertyInfo = (PSPropertyInfo)item.Properties[propertyListItemTrimFront];
                        if (propertyInfo != null)
                        {

                            if (!(propertyInfo.TypeNameOfValue == "System.String[]") && !(propertyInfo.TypeNameOfValue.Contains("System.Nullable")))
                            {
                                //MessageBox.Show("1. " + propL.Name.ToString() + ", 2. " + propL.Value.ToString());
                                if ((propertyInfo.Name != null) && (propertyInfo.Value != null))
                                {
                                    textBox1.Text += ("Property name: " + propertyInfo.Name.ToString() + ", Property value: " + propertyInfo.Value.ToString());
                                    textBox1.Text += System.Environment.NewLine;
                                }
                                else
                                {
                                    textBox1.Text += ("Property has a null value");
                                    textBox1.Text += System.Environment.NewLine;
                                }
                            }
                            if (propertyInfo.TypeNameOfValue == "System.String[]" && !(propertyInfo.TypeNameOfValue.Contains("System.Nullable")))
                            {
                                //string[] propertyLArr = Convert.(propL.Value.ToString();

                                IList propertyArrayList = (IList)propertyInfo.Value;
                                if (propertyArrayList.Count == 0)
                                {
                                    if ((propertyInfo.Name != null) && (propertyInfo.Value != null))
                                    {
                                        textBox1.Text += ("Property name: " + propertyInfo.Name.ToString() + ", Property value: " + propertyArrayList.Count);
                                        textBox1.Text += System.Environment.NewLine;
                                    }
                                    else
                                    {
                                        textBox1.Text += ("Property has a null value");
                                        textBox1.Text += System.Environment.NewLine;
                                    }
                                }

                                if (propertyArrayList.Count > 0)
                                {
                                    if ((propertyInfo.Name != null) && (propertyInfo.Value != null))
                                    {
                                        textBox1.Text += ("Property name: " + propertyInfo.Name.ToString() + ", Property value: " + propertyArrayList.Count);
                                        textBox1.Text += System.Environment.NewLine;
                                        foreach (string listItem in propertyArrayList)
                                        {
                                            //MessageBox.Show("1. " + propL.Name.ToString() + "2. " + listItem);
                                            textBox1.Text += ("Property name: " + propertyInfo.Name.ToString() + ", Property value: " + listItem);
                                            textBox1.Text += System.Environment.NewLine;
                                        }
                                    }
                                    else
                                    {
                                        textBox1.Text += ("Property has a null value");
                                        textBox1.Text += System.Environment.NewLine;
                                    }
                                }

                                //object systemStringArray = propL.Value;
                                //ArrayList arr2 = new ArrayList();
                                //arr2.Add(propL.Value);

                                //foreach (var arr2Value in arr2)
                                //{
                                //    MessageBox.Show("1. " + propL.Name.ToString() + "2. " + propL.Value.ToString());
                                //    MessageBox.Show(arr2Value.ToString());
                                //}
                            }
                        }
                        //propertyList2.Add(propL.ToString());
                    }
                }

            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                //throw;
            }
        }
    }
}

using System;
using System.IO;
using System.Text;
using System.Reflection;
using System.Diagnostics;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Management.Automation; // Add reference to System.Management.Automation
using System.Management.Automation.Host;
using System.Management.Automation.Runspaces;


namespace exchangePowerShell

{
   public sealed class ExchangeManagementShellWrapper
   {
      #region Variable Declaration
      private RunspaceConfiguration rc;         //RunspaceConfiguration
      private Runspace r;                       //Runspace
      private RunspaceInvoke ri;                //RunspaceInvoke
      private static readonly ExchangeManagementShellWrapper instance = new ExchangeManagementShellWrapper(); //Singleton instance
      #endregion
      private ExchangeManagementShellWrapper(){}

      public static ExchangeManagementShellWrapper Instance
      {
         get
         {
            return instance;
         }
      }

      private void InitializeRunspace()
      {
         //Setup Runspace environment for Exchange Management Shell
         AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(AssemblyResolver);
         //Create RunspaceConfiguration
         rc = RunspaceConfiguration.Create();
         //Add PSSnapIn for Exchange 2007 and check for warnings
         PSSnapInException warning;
         PSSnapInInfo info = rc.AddPSSnapIn("Microsoft.Exchange.Management.PowerShell.Admin", out warning);
         if (warning != null)
         {
            // A warning is not expected, but if one is detected
            // write the warning and return.
            System.Console.Write(warning.Message);
            return;
         }

         //Create and open runspace
         r = RunspaceFactory.CreateRunspace(rc);
         r.Open();
      }

      private void InitializeRunspaceInvoke()
      {
         //Create runspace if it has not already been created
         if (r == null) { InitializeRunspace(); }
         //Create RunspaceInvoke
         ri = new RunspaceInvoke(r);
      }

      public ICollection<PSObject> RunspaceInvoke(string EMSCommand)
      {
         //Create RunspaceInvoke if it has not already been created
         if (ri == null) { InitializeRunspaceInvoke(); }
         //Invoke the commmand and return the results
         return ri.Invoke(EMSCommand);
      }

      public ICollection<PSObject> RunspaceInvoke(string EMSCommand, IEnumerable input)
      {
         //Create RunspaceInvoke if it has not already been created
         if (ri == null) { InitializeRunspaceInvoke(); }
         //Invoke the commmand and return the results
         return ri.Invoke(EMSCommand, input);
      }

      public ICollection<PSObject> RunspaceInvoke(string EMSCommand, out IList errors)
      {
         //Invoke the RunspaceInvoke method with a null input
         return RunspaceInvoke(EMSCommand, null, out errors);
      }

      public ICollection<PSObject> RunspaceInvoke(string EMSCommand, IEnumerable input, out IList errors)
      {
         //Create RunspaceInvoke if it has not already been created
         if (ri == null) { InitializeRunspaceInvoke(); }
         //Invoke the commmand and return the results and errors
         return ri.Invoke(EMSCommand, input, out errors);
      }

      public ICollection<PSObject> PipelineInvoke(Collection<Command> EMSCommands, out PipelineReader<object> Errors)
      {
         //Create Runspace if it has not already been created
         if (r == null) { InitializeRunspace(); }
         //Create Pipeline and add the commands
         Pipeline pipeline = r.CreatePipeline();
         foreach (Command item in EMSCommands)
         {
            pipeline.Commands.Add(item);
         }
         //Invoke the commands and return the results and errors
         ICollection<PSObject> results = pipeline.Invoke();
         Errors = pipeline.Error;
         pipeline = null;
         return results;
      }

      public ICollection<PSObject> PipelineInvoke(Collection<Command> EMSCommands)
      {
         //Create Runspace if it has not already been created
         if (r == null) { InitializeRunspace(); }
         //Create Pipeline and add the commands
         Pipeline pipeline = r.CreatePipeline();
         foreach (Command item in EMSCommands)
         {
            pipeline.Commands.Add(item);
         }
         //Invoke the commands and return the results
         return pipeline.Invoke();
      }

      public ICollection<PSObject> PipelineInvoke(Command EMSCommand, out PipelineReader<object> Errors)
      {
         //Create Runspace if it has not already been created
         if (r == null) { InitializeRunspace(); }
         //Create Pipeline and add the command
         Pipeline pipeline = r.CreatePipeline();
         pipeline.Commands.Add(EMSCommand);
         //Invoke the command and return the results and errors
         ICollection<PSObject> results = pipeline.Invoke();
         Errors = pipeline.Error;
         pipeline = null;
         return results;
      }

      public ICollection<PSObject> PipelineInvoke(Command EMSCommand)
      {
         //Create Runspace if it has not already been created
         if (r == null) { InitializeRunspace(); }
         //Create Pipeline and add teh command
         Pipeline pipeline = r.CreatePipeline();
         pipeline.Commands.Add(EMSCommand);
         //Invoke the command and return the results
         return pipeline.Invoke();
      }

      public void Dispose()
      {
         //Close the Runspace and cleanup
         r.Close();
         ri = null;
         r = null;
      }

      private static System.Reflection.Assembly AssemblyResolver(object p, ResolveEventArgs args)
      {
         //Add path for the Exchange 2007 DLLs
         if (args.Name.Contains("Microsoft.Exchange"))
         {
            return Assembly.LoadFrom(Path.Combine("C:\\Program Files\\Microsoft\\Exchange Server\\bin\\", args.Name.Split(',')[0] + ".dll"));
         }
         else
         {
            return null;
         }
      }
   }
}

VoIP with C# on a 64Bit Windows 7

DJ-Boris16-Jun-11 9:44

DJ-Boris

16-Jun-11 9:44

Hello
I have some problems with VoIP.
I'm working on a P2P VoIP Application with C#. There are around 6 examples in the Internet, but none of them work. When I use the dll files of the librarys (Open h323, TAPI3...), it shows me an error:"COM Not registered".

Does anyone know an easy to use library, working with Visual Studio 2010 Ultimate and Win7 64Bit.

I've tried all the examples below
Examples to create your Conferencing System in .NET, C# VOIP & Video Conferencing Systems using H.323 and TAPI 3[^]

Thx

Re: VoIP with C# on a 64Bit Windows 7

BobJanova17-Jun-11 0:21

BobJanova

17-Jun-11 0:21

If the examples use a COM component you need to register it first (either by running its installer or on the command line with regsvr32).

FTP Problem

Kevin Marois16-Jun-11 9:07

Kevin Marois

16-Jun-11 9:07

I have this FTP code. I'm trying to get a list of files from the server. All it returns is an entry for the root folder.. Using FileZilla and/or CuteFTP I can see the subfolders and files in them. Why isnt't my returning anything other than the root folder?

public struct FTPCredentials
{
    public string FTPServer { get; set; }
    public string UserName { get; set; }
    public string Password { get; set; }
}

public List<string> GetFileList(FTPCredentials Credentials)
{
    List<string> retVal = new List<string>();

    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(Credentials.FTPServer);
    request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
    request.KeepAlive = true;
    request.UsePassive = false;

    try
    {
        request.Credentials = new NetworkCredential(Credentials.UserName, Credentials.Password);

        FtpWebResponse response = (FtpWebResponse)request.GetResponse();

        Stream stream = response.GetResponseStream();

        StreamReader reader = new StreamReader(stream);
        string line = reader.ReadLine(); 
                
        while (!string.IsNullOrEmpty(line)) 
        {
            retVal.Add(line);
            line = reader.ReadLine(); 
        }

        reader.Close(); 
        response.Close();
    }
    catch (Exception e)
    {
        throw e;
    }

    return retVal;
}

Everything makes sense in someone's mind

Re: FTP Problem [modified]

Matt Meyer16-Jun-11 10:22

Matt Meyer

16-Jun-11 10:22

FTP works similar to filesystem operations, so requesting anything from the server will work only in the current working directory. Since you're using FtpWebRequest, you'll also need to think of your FTP 'session' more in terms of HTTP style communications (browsing an FTP site using a web browser instead of an FTP client). You make one request, and you get one response. When you create the request:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);

The variable 'uri' is actually both the server and the full path of your working directory. So if you want to connect to ftp.server.com and get the directory contents of path 'some/path', you would create your FtpWebRequest like so:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.server.com/some/path");

If you want to monitor how FTP actually communicates with ftp servers, enable the messages view in FileZilla (View > Message log). These are all happening implicitly when using the FtpWebRequest object.

I'd recommend finding an FTP library (or writing your own if you have the cohones, several RFCs make up the spec now) if you're going to be doing anything more than simple FTP operations.

modified on Thursday, June 16, 2011 4:29 PM

Re: FTP Problem

Kevin Marois16-Jun-11 12:15

Kevin Marois

16-Jun-11 12:15

Thanks for the response. I think I understand. Some comments...

I set up a test FTP folder:

FTPServer = "ftp://ftp.maroisconsulting.com/test",
UserName = "FTPTest", 
Password = "testftp"

When I run the code, I get the exception:

The remote server returned an error: (550) File unavailable (e.g., file not found, no access).

I'm sorta lost here. I don't understand why this doesn't work. The folder exitst with 2 test files in it. My FTP Client (FileZilla )works, but not this code.

Everything makes sense in someone's mind

Re: FTP Problem

Matt Meyer16-Jun-11 13:10

Matt Meyer

16-Jun-11 13:10

Based on the error number, your FTP client is connecting and authenticating without any problems. The problem seems to be realted to the server. It's possible that that access is denied to the file/directory (either by permission or file lock). If you have access to the server, verify the permissions for user FTPTest. You also might want to verify that the FtpWebRequest object credentials match your FileZilla settings exactly.

You could also try it against another FTP server you have access to and verify it. You code works for me when I tried it against both anonymous servers and my own.

Re: FTP Problem

Kevin Marois16-Jun-11 13:20

Kevin Marois

16-Jun-11 13:20

Thanks Matt. That's good to know.

Everything makes sense in someone's mind

Reverse (2-way) synchronization: DataGridView to Table (Database)

Paladin200016-Jun-11 3:49

Paladin2000

16-Jun-11 3:49

I am attempting to accomplish 2-way synch from a DataGridView to a table in my database. DGV to table is easy, but is there a "best practice" way to have the DGV automatically update to reflect any changes made to the database?

I tried using a timer and perform a TableAdapter.Fill(DataSet.SomeTable) at regular intervals, but the problem with this approach is that it "clobbers" any edit in progress, and resets the selected row to the top. Preferably, I would avoid impacting the user so directly.

Thank you...

EDIT: Here is how I am synching DGV changes to the database:

private void dgvSomeView_RowValidated(object sender, DataGridViewCellEventArgs e)
{
    myTableAdapter.Update(myDataSet.MyTable);
}

Re: Reverse (2-way) synchronization: DataGridView to Table (Database)

Paladin200016-Jun-11 5:09

Paladin2000

16-Jun-11 5:09

I think I found what I need: the SqlDependency class.
Looking into it now...

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.