C# Discussion Boards - CodeProject

Re: How to read bytes from Stream into Objects?

Eddy Vluggen3-Jul-12 7:00

Eddy Vluggen

3-Jul-12 7:00

Serialize your employee, using the binaryformatter Smile | :)

Serializing means that you'd encode it in a portable format. You can use different formatters, but the Xml-version doesn't sound too appropriate under these circumstances, hence the binaryformatter.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: How to read bytes from Stream into Objects?

Software20073-Jul-12 7:35

Software2007

3-Jul-12 7:35

Can you elaborate a bit. So, I have a stream

"firstname=Mike&lastname=Smith&..binary represenation for the image here.."

in binary format.

[Serializable]
    public class Employee {
Serialize()..
Deserialize()..
}

This sounds like I need a file for the serialization, but I thought this was memory data type of thing.
Anyways, what after this, how do I read it in to the class members what I don't get?
How do I go from Stream type which is sent to me to Employee? Note, stream comes from iphone app.

modified 3-Jul-12 14:09pm.

SpellChecker

Murugavel Sadagopan2-Jul-12 15:43

Murugavel Sadagopan

2-Jul-12 15:43

Hi,

I have created a Texteditor using C#. In this I am using Spellchecker with the help of NHunspell.

When i am entering more than 60000 characters its hanged. Its performance is too slow. But its very fast while the spellchecker is off.

How can i achieve the spellchecker is on for the customer view page only onto the entire.

The following code that i can used for dictionary on/off

if (btnsCheck.BackColor==Color.Green)
{
this.NHunspellTextBoxExtender1.SetSpellCheckEnabled(this.TextEditor, false);
this.NHunspellTextBoxExtender1.SpellAsYouType = false;
btnsCheck.BackColor = Color.Red;
}
else
{
this.NHunspellTextBoxExtender1.SetSpellCheckEnabled(this.TextEditor, true);

string TempSt = this.TextEditor.SelectedText;
this.NHunspellTextBoxExtender1.SpellAsYouType = true;
this.TextEditor.SelectedText = " quot;;
btnsCheck.BackColor = Color.Green;
}
}

Thanks,
Murugavel S

Re: SpellChecker

Abhinav S2-Jul-12 16:27

Abhinav S

2-Jul-12 16:27

Have a look at NHunspellTextBoxExtender - A Spellchecking IExtenderProvider for TextBoxes using Hunspell for .NET[^].

Look at the Optimizations section in the article.
Preventing redrawing and scrolling could improve performance too.

Build your own survey - http://www.factile.net

Re: SpellChecker

Unnikrishnan_S_N3-Jul-12 3:07

Unnikrishnan_S_N

3-Jul-12 3:07

Hi Murugavel,

I think you should be using background thread to do spell checks to overcome UI unresponsiveness.
Execute your spellcheck call this.NHunspellTextBoxExtender1.SetSpellCheckEnabled(this.TextEditor, false); in a different thread.

http://msdn.microsoft.com/en-us/library/cc221403%28v=vs.95%29.aspx[^]

Message Removed

2-Jul-12 8:19

N_tro_P

2-Jul-12 8:19

Message Removed

Re: Modify Top most

Alan N2-Jul-12 9:30

Alan N

2-Jul-12 9:30

This is one of the uses of the Windows SetWindowPos function and is demonstrated with an annoying program that makes all open Notepad windows topmost for 10 seconds. That's just long enough to click on them a few times to confirm the modified behaviour before they revert to normal.

Alan.

using System;
using System.Diagnostics;
using System.Threading;
using System.Runtime.InteropServices;
namespace MakeTopMost {
  internal sealed class App {
    /// <summary>
    /// Flags values for SetWindowPos function
    /// </summary>
    [Flags]
    public enum SWP : uint {
      NOSIZE = 0x0001,
      NOMOVE = 0x0002,
      NOZORDER = 0x0004,
      NOREDRAW = 0x0008,
      NOACTIVATE = 0x0010,
      DRAWFRAME = 0x0020,
      FRAMECHANGED = 0x0020,
      SHOWWINDOW = 0x0040,
      HIDEWINDOW = 0x0080,
      NOCOPYBITS = 0x0100,
      NOOWNERZORDER = 0x0200,
      NOREPOSITION = 0x0200,
      NOSENDCHANGING = 0x0400,
      DEFERERASE = 0x2000,
      ASYNCWINDOWPOS = 0x4000
    }

    // SetWindowPos hwndInsertAfter special values
    // Must cast to IntPtr
    public const Int32 HWND_TOPMOST = -1;
    public const Int32 HWND_NOTOPMOST = -2;

    // http://msdn.microsoft.com/en-us/library/windows/desktop/ms633545(v=vs.85).aspx
    [DllImport("user32.dll", EntryPoint = "SetWindowPos")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool SetWindowPos(
      [In] IntPtr hWnd,
      [In] IntPtr hWndInsertAfter,
      Int32 X, Int32 Y, Int32 cx, Int32 cy,
      SWP Flags);

    internal static void Main() {
      Process[] ps = Process.GetProcessesByName("notepad");
      foreach (Process p in ps) {
        Console.WriteLine("TopMost");
        MakeTopMost(p.MainWindowHandle);
      }
      Thread.Sleep(10000);
      foreach (Process p in ps) {
        Console.WriteLine("Not TopMost");
        RemoveTopMost(p.MainWindowHandle);
      }
      Console.WriteLine("...end");
      Console.ReadLine();
    }

    private static void MakeTopMost(IntPtr targetHwnd) {
      const SWP flags = SWP.NOSIZE | SWP.NOMOVE;
      SetWindowPos(targetHwnd, (IntPtr)HWND_TOPMOST, 0, 0, 0, 0, flags);
    }

    private static void RemoveTopMost(IntPtr targetHwnd) {
      const SWP flags = SWP.NOSIZE | SWP.NOMOVE;
      SetWindowPos(targetHwnd, (IntPtr)HWND_NOTOPMOST, 0, 0, 0, 0, flags);
    }
  }
}

Message Removed

2-Jul-12 10:48

N_tro_P

2-Jul-12 10:48

Message Removed

Re: Modify Top most

Alan N3-Jul-12 11:03

Alan N

3-Jul-12 11:03

Colin,
In the following method is there something missing as I don't see how _hWnd1 is set.

private void StartOtherProcesses()
        {
            Process.Start(APP_1);
 
            SetWindowPos(_hWnd1, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
        }

Assuming there is some missing code, i.e. SetHwnd(), have you checked that the GetWindowsHandler method does actually get a non zero handle. Handle creation will be some time after process start and it not uncommon for Process.MainWindowHandle to be IntPtr.Zero for several hundred milliseconds even after Process.WaitForInputIdle() has returned (despite what MSDN says!).

By the way, I have verified by reading the extended style bits with GetWindowLong, that SetWindowPos will remove the WS_EX_TOPMOST style from a maximized topmost window.

Alan.

modified 3-Jul-12 21:00pm.

Re: Modify Top most

Abhinav S2-Jul-12 16:15

Abhinav S

2-Jul-12 16:15

Alan N's solution is a very good one.

However, check if they have some modal / non-modal type if property which you can set in this control.
This will allow you to get away without writing sooo much more code.

Build your own survey - http://www.factile.net

Color Detection Using Emgu HSV

caoc72-Jul-12 7:12

caoc7

2-Jul-12 7:12

Please. Can help.... I need to filter the color red, Green and yellow in a image contained in the control Emgu.CV.UI.ImageBox.

Please can guide as I detect any of the three colors (red, green, yellow).
filter using HSV

modified 2-Jul-12 16:36pm.

Re: Color Detection Using Emgu

Dave Kreskowiak2-Jul-12 9:01

Dave Kreskowiak

2-Jul-12 9:01

Go through this article[^].

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Databinding a DataGridView not immediately available

Dewald2-Jul-12 4:11

Dewald

2-Jul-12 4:11

I have a form containing a DataGridView which I want to populate immediately upon creating the new form. The DataGridView is populated from a SQL query and I do it as follows:

using (SqlCommand mySqlCommand = new SqlCommand("SELECT * FROM MyTable", mySqlConnection))
{
    using (SqlDataReader mySqlDataReader = sqlCommand.ExecuteReader())
    {
        DataSet myDataSet = new DataSet();
        DataTable myDataTable = new DataTable();
        myDataSet.Tables.Add(myDataTable);
        myDataSet.Load(mySqlDataReader, LoadOption.PreserveChanges, myDataSet.Tables[0]);
        myDataGridView.DataSource = myDataSet.Tables[0];
    }
}

myDataGridView.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
foreach(DataGridViewRow myRow in myDataGridView.Rows)
    // Do something with some of the values in the row

Now, the above code works perfectly except for the last two lines of code, which automatically resizes each column to fit the widest cell and which iterates through the DataGridView and does something with some of the values. The reason this won't work is because, by the time they are executed, the databinding for the DataGridView might not yet be finished.

One solution is to add

myDataGridView.DataBindingComplete += new DataGridViewBindingCompleteEventHandler(myDataGridView_DataBindingComplete);

And then put those lines of code inside the event handler.

For various reasons, it happens from time to time that I'd rather have those lines of code inside the original function that populates the form. I'd be quite happy to enter a loop that will wait for the data binding to complete before I continue but I don't know how. Any suggestions?

Re: Databinding a DataGridView not immediately available

Jasmine25012-Jul-12 5:46

Jasmine2501

2-Jul-12 5:46

Can't you just call the DataBind function explicitly?

like... myDataGridView.Databind();

Everything should be ready to go after that...

Re: Databinding a DataGridView not immediately available

Dewald2-Jul-12 6:30

Dewald

2-Jul-12 6:30

No, I believe that works only for Webforms, not for Winforms as is the case here.

I don't understand why that method is not available in winforms as it would have been the perfect solution for this problem of mine.

How to add annotation to the pdf file viewed by axAcroPdf component

candogu2-Jul-12 3:54

candogu

2-Jul-12 3:54

Hi, I need to edit the pdf using axAcroPdf component but, buttons used to edit are disabled. I cannot click on the buttons??? Thx.

Having trouble connecting with my datasource

deadEddie1-Jul-12 18:38

deadEddie

1-Jul-12 18:38

Hey there, I'm sure there is some simple newbie problem with my code, but I have not been able to figure it out and was hoping another set of eyes would help.

I'm working on a financial accounting tool that so far has two tables, a Users table and an AccountsTransactions table, The below method is from my DatabaseCommunicator class. It builds fine but crashes with a message that the "Balance" column is not in the AccountsTransactions Table. Since I know that the column is in fact in the table, the only thing I can think of as being the problem is that I'm not actually connecting to the datasource and filling the dataset. Can anyone see where I'm going wrong?

Thanks in advance. Confused | :confused:

public string[] CreateNewTransaction(int UserID) // note the use of string[] as the method return type
        {
            // create an array to hold method results
            string[] returnArray = new string[2];

            string selectSql = "SELECT Count(*) FROM AccountTransactions WHERE UserID = @UserID";

            // new SqlConnection
            connect = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename='C:\\Users\\Ed\\Documents\\Visual Studio 2010\\Projects\\School Projects\\Accounts\\Accounts\\Accounts.mdf';Integrated Security=True;User Instance=True");

            // initialize SqlDataAdapter
            dataAdapter = new SqlDataAdapter();

            SqlCommand cmd = new SqlCommand(selectSql, connect);

            dataAdapter.SelectCommand = cmd;

            // parameters for cmd
            cmd.Parameters.AddWithValue("@UserID", UserID);

            // create a new DataSet
            dataSet = new DataSet();
                        
            dataAdapter.Fill(dataSet, "AccountTransactions");

            // create variable equal to the count of rows in the database and set the DataRow to that row number
            int lastRow = dataSet.Tables["AccountTransactions"].Rows.Count-1;
            DataRow dRow = dataSet.Tables["AccountTransactions"].Rows[lastRow];
                        
            returnArray[0] = Convert.ToString(dataSet.Tables["AccountTransactions"].Rows[lastRow]["Balance"]);
            returnArray[1] = Convert.ToString(dataSet.Tables["AccountTransactions"].Rows[lastRow]["TransactionNo"]);

            connect.Dispose();

            return returnArray;
        }

Re: Having trouble connecting with my datasource

Hum Dum1-Jul-12 19:51

Hum Dum

1-Jul-12 19:51

deadEddie wrote:
string selectSql = "SELECT Count(*) FROM AccountTransactions WHERE UserID = @UserID";

You are selecting column which are not present is select statement.

deadEddie wrote:
returnArray[0] = Convert.ToString(dataSet.Tables["AccountTransactions"].Rows[lastRow]["Balance"]);
returnArray[1] = Convert.ToString(dataSet.Tables["AccountTransactions"].Rows[lastRow]["TransactionNo"]);

For accessing balance and transaction include them is select statement, like

Select Balance, TransactionNo FROM AccountTransactions WHERE UserID = @UserID;

Re: Having trouble connecting with my datasource

deadEddie2-Jul-12 5:15

deadEddie

2-Jul-12 5:15

Thanks Hum Dum. Of course that fixed my problem.

DE

Re: Having trouble connecting with my datasource

AnnieCalvert1-Jul-12 22:40

AnnieCalvert

1-Jul-12 22:40

It may help you .read it.
http://www.dapfor.com/en/net-suite/net-grid/tutorial

Re: Having trouble connecting with my datasource

deadEddie2-Jul-12 17:59

deadEddie

2-Jul-12 17:59

Thanks Annie. Good read

TcpClient with Proxy

Falchon1-Jul-12 13:37

Falchon

1-Jul-12 13:37

Hello guys, how can i do sock5 proxy for this ?

client = new TcpClient(host, port);
setClient(client);

Re: TcpClient with Proxy

Luc Pattyn1-Jul-12 14:35

Luc Pattyn

1-Jul-12 14:35

Maybe this[^] could help you out.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: TcpClient with Proxy

Falchon1-Jul-12 14:53

Falchon

1-Jul-12 14:53

no i didn't help Frown | :(

i need to connect a gameserver with different ips with 5 tcp clients.

Odd RuntimeBinderException

LastAndFirst1-Jul-12 0:27

LastAndFirst

1-Jul-12 0:27

I'm getting a very weird RuntimeBinderException that I cannot explain. I'm using .NET 4.0 and Workflow Foundation 4.0. The exception occurs when the workflow reaches an activity that uses the class that I assume is raising exception.

"The System.Datetime type cannot be implicitly converted to string".

The code never really reaches the method where the exception occurs (at least I assume it's this method as the console displays my own text that I write to the console in the catch block, though after changing the text it's the the old text I use) but rather seems to throw the exception before the method is actually called.

What's most confusing is that I don't really use any dynamics and made sure I don't implicitly convert a date to a string.

The System.Dynamics namespace is not used anywhere in the entire solution.

I use the SAP Business 1 RecordSet class, which has dynamics as fields, but this is the first time I get anything like this exception and I have been using them for months.

This is the code of the method: http://pastebin.com/FjxeXWB5[^]
This is the exception:http://i45.tinypic.com/mkhyde.png[^]

Thanks.

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