ASP.NET , C#.net , VB.net: February 2009

Running a .bat file using C# Process

Process.Start(@"C:\

Program Files\Adobe\After Effects 6.5\Support Files\afterfx.exe", "-r " + path2);

Mod funtion in c#?

//Mode Function in C#.net
if(n%3==0)
{
//do this
}
else
{
//do that
}

Sorting 2 dimensional array/arraylist

See code snippet for an example. Let me know if you have a question.

Fernando

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;


namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // Holds the list from the file
            List<String> dataSorted = new List<string>();
            // Read the lines from the file
            StreamReader sr = new StreamReader("Data.txt");
            while (!sr.EndOfStream)
            {
                // insert line into list
                dataSorted.Add(sr.ReadLine());
            }
            // Sort the list with a custom compare
            dataSorted.Sort(AddressCompare);

            // Display the list to the console window or write to file
            foreach( String data in dataSorted )
            {
                Console.WriteLine(data);
            }
        }

        int AddressCompare(object x, object y)
        {
            // Two null objects are equal
            if (x == null && y == null) return 0;
            //Any object that is not null is greater then an object that is null
            if (x == null) return -1;
            if (y == null) return 1;

            // CheckBox to see that both objects are Strings
            if (!(x.GetType() == typeof(String) && y.GetType() == typeof(String)))
            {
                throw new ArgumentException("Can't compare " + x.GetType().ToString() +
                    "/" + y.GetType().ToString());
            }

            // Parse the string to get the address
            String[] addr = new String[2];
            String[] type = new String[2];
            type[0] = x.ToString().Substring(0, 2);
            type[1] = y.ToString().Substring(0, 2);
            for (int idx = 0; idx < 2; idx++)
            {
                // Not sure how long the address field is so I added all the types given in the 
                // you will need to modify the length of the address for each type element 0 is
                // the x string and element 1 is the y string.
                switch (type[idx])
                {
                    case "S0":
                        if (idx == 0)
                        {
                            addr[0] = x.ToString().Substring(4, 6);
                        }
                        else
                        {
                            addr[1] = y.ToString().Substring(4, 6);
                        }
                        break;
                    case "S3":
                        if (idx == 0)
                        {
                            addr[0] = x.ToString().Substring(4, 6);
                        }
                        else
                        {
                            addr[1] = y.ToString().Substring(4, 6);
                        }
                        break;
                    case "S5":
                        if (idx == 0)
                        {
                            addr[0] = x.ToString().Substring(4, 6);
                        }
                        else
                        {
                            addr[1] = y.ToString().Substring(4, 6);
                        }
                        break;
                    case "S7":
                        if (idx == 0)
                        {
                            addr[0] = x.ToString().Substring(4, 6);
                        }
                        else
                        {
                            addr[1] = y.ToString().Substring(4, 6);
                        }
                        break;
                }
            }
            // Convert hex string to integer
            int[] key = new int[2];
            key[0] = int.Parse(addr[0], System.Globalization.NumberStyles.HexNumber);
            key[1] = int.Parse(addr[1], System.Globalization.NumberStyles.HexNumber);

            // compare integer values
            if (key[0] == key[1]) return 0;
            if (key[0] < key[1]) return -1;
            return 1;
        }
    }
}

Using C# how do get image size (bytes) from a image obtained from a URL

Hi,
You should download the image first and then check the image size. I dont think there is any other option

Here is the c# code for Image/File download

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private int DownloadImage(string link)
        {
            try
            {
                Uri uri = new Uri(link);
                HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
                webrequest.Method = "GET";

                webrequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, */*";

                webrequest.KeepAlive = false;
                HttpWebResponse responce = (HttpWebResponse)webrequest.GetResponse();
                Stream S = responce.GetResponseStream();
                FileStream writeStream = new FileStream(<<FilePath>, FileMode.Create, FileAccess.Write); //Filepath to save
                ReadWriteStream(S, writeStream);
                responce.Close();
                return 1;
            }
            catch (Exception)
            {
                return 0;
            }
        }

        // readStream is the stream you need to read
        // writeStream is the stream you want to write to
        private void ReadWriteStream(Stream readStream, Stream writeStream)
        {
            int Length = 256;
            Byte[] buffer = new Byte[Length];
            int bytesRead = readStream.Read(buffer, 0, Length);
            // write the required bytes
            while (bytesRead > 0)
            {
                writeStream.Write(buffer, 0, bytesRead);
                bytesRead = readStream.Read(buffer, 0, Length);
            }
            readStream.Close();
            writeStream.Close();
        }

Capture mouse click before control in VB.net

Copy the following code snippet your form. I got this code from the thread above and just added a public variable to store the control that the mouse is currently over.

Public Class Form2

    Public myCtrlOver As String
    Private WithEvents mf As New MyFilter

    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Application.AddMessageFilter(mf)
    End Sub

    Private Sub mf_MouseMove() Handles mf.MouseMove
        If Form.ActiveForm Is Me Then
            Dim clientPT As Point
            Dim formPT As Point = Me.PointToClient(Cursor.Position)
            Dim ctlName As String
            Dim ctl As Control = FindControl(Me)
            If Not IsNothing(ctl) Then
                ctlName = ctl.Name
                clientPT = ctl.PointToClient(Cursor.Position)
            Else
                ctlName = Me.Name
                clientPT = Me.PointToClient(Cursor.Position)
            End If
            '            Debug.Print(ctlName & ": " & clientPT.ToString & "    Form: " & formPT.ToString)

            myCtrlOver = ctlName

            Me.Label1.Text = ctlName
            Me.Label1.Refresh()
        Else
            ' ...WM_MOUSEMOVE is targeting a form other than this one...
        End If
    End Sub

    Private Function FindControl(ByVal cont As Control) As Control
        Dim ctl As Control = cont.GetChildAtPoint(cont.PointToClient(Cursor.Position))
        If Not IsNothing(ctl) Then
            If ctl.HasChildren Then
                Dim subCtl As Control = FindControl(ctl)
                If Not IsNothing(subCtl) Then
                    Return subCtl
                Else
                    Return ctl
                End If
            Else
                Return ctl
            End If
        Else
            Return Nothing
        End If
    End Function

    Private Class MyFilter
        Implements IMessageFilter

        Public Event MouseMove()
        Private Const WM_MOUSEMOVE As Integer = &H200

        Public Function PreFilterMessage(ByRef m As System.Windows.Forms.Message) As Boolean Implements System.Windows.Forms.IMessageFilter.PreFilterMessage
            Select Case m.Msg
                Case WM_MOUSEMOVE
                    RaiseEvent MouseMove()

            End Select
        End Function

    End Class

    Private Sub Form2_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

        If myCtrlOver <> "YourMenuPanelName" Then

            ' Put your code here to close the menu

        End If

    End Sub
End Class

Question:

I have a form that contain several textboxes that are bound to a database.row that has int32 as datatype and allows dbNull value. When a user starts up the form, the code inserts three values (this is because the user needs to know these values before filling in the rest), and fills the tableadapter with data so many textboxes is bound to dbNull value.

The form has many textboxes bound to a SQL-database and the form functions very well if you put correct data into the form. I also have checks on the textboxes that must have int as datatyp that the text is possible to parse as an int (so all checks is ok).

My problem is as follows:
1. If a user "tabs" his way throug the form and accidentally puts a character into a textbox that must have an int they get a warning saying the textbox can only contain integers.
2. If they delete the character the textbox.validate() locks the control and I cannot get the form to do anything until the user puts in an int into the box. If the user puts in an int the validatoin works and form is unlocked again. I want it also to validate=true when textbox is empty, but I cannot seem to get this to work.
3. I want to set the textbox back to its previous state whenever the textbox.text.length == 0, because then it is the same as when you open the form and this validates fine (because it contains no data).
4. Attached code that I have to check the textboxes, but the only thing that happens is textboxSjekk.clear() and then the form locks itself because an empty textbox does not validate to int (but an empty textbox on startup does).

Hope this was understandable.

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                                      private void feilMldTall(TextBox textBoxSjekk, string feilKontroll)
        {
            if (textBoxSjekk.Text.Length > 0)
            {
                try
                { Int32.Parse(textBoxSjekk.Text); }
                catch (Exception)
                {
                    MessageBox.Show("Can only contain int");

                }
            }
            else
            {
                textBoxSjekk.Clear();
            }
        
        }

ANSWER:
implement the validating event of textboxes:

private void textBoxSjekk_Validating(ob

ject sender, CancelEventArgs e)
{
if (textBoxSjekk.Text.Length > 0)
{
try
{ Int32.Parse(textBoxSjekk.Text); }
catch (Exception)
{
MessageBox.Show("Can only contain int");
textBoxSjekk.Clear();
textBoxSjekk.Focus();
}
}
}

If you want to restore to the previous valid state of the textbox:

public partial class Form1 : Form
{
string _previousValidTextBoxSjekk;
public Form1()
{
InitializeComponent();
textBoxSjekk.Text = "2";
_previousValidTextBoxSjekk = textBoxSjekk.Text; //initialize
}

private void textBoxSjekk_Validating(object sender, CancelEventArgs e)
{
if (textBoxSjekk.Text.Length > 0)
{
int i;
if(!Int32.TryParse(textBoxSjekk.Text,out i))
{

MessageBox.Show("Can only contain int");
textBoxSjekk.Text = _previousValidTextBoxSjekk;
textBoxSjekk.Focus();
return;
}
_previousValidTextBoxSjekk = textBoxSjekk.Text; // here if you only want to restore to a populated state of the textbox once it was populated at some point in time
}
// _previousValidTextBoxSjekk = textBoxSjekk.Text ; //here if you want to add also empty as a previous valid state
}
}

Get processor id using c#.net

Try this (add

reference to System.Management):

public string GetCPUId()
{
string cpuInfo = String.Empty;
string temp = String.Empty;
ManagementClass mc = new ManagementClass("Win32_Processor");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
if (cpuInfo == String.Empty)
{// only return cpuInfo from first CPU
cpuInfo = mo.Properties["ProcessorId"].Value.ToString();
}
}
return cpuInfo;
}

ASP.NET , C#.net , VB.net

Friday, February 6, 2009

Running a .bat file using C# Process

Mod funtion in c#?

Sorting 2 dimensional array/arraylist

Using C# how do get image size (bytes) from a image obtained from a URL

Capture mouse click before control in VB.net

c# textbox validation

Get processor id using c#.net

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