Snippets 4 You: 2012

Thursday, September 27, 2012

Create thumbnail using c#

private void CreateThumbnail(string imgPath)
{
try
{
Image photoImg = Image.FromFile(imgPath);
Image thumbPhoto = photoImg.GetThumbnailImage(200,150,null,new System.IntPtr());
thumbPhoto.Save(@"C:\aaa.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (Exception exp)
{
MessageBox.Show("Select a valid photo!");
return;
}
}

Monday, April 2, 2012

How to refresh desktop using c# ?

Code :

[System.Runtime.InteropServices.DllImport("Shell32.dll")]
private static extern int SHChangeNotify(int eventId, int flags, IntPtr item1, IntPtr item2);

public static void Refresher()
{
// Refresh the desktop
SHChangeNotify(0x8000000, 0x1000, IntPtr.Zero, IntPtr.Zero);
}

Monday, February 27, 2012

How to extract custom animation details from ppt using c# ?

The code shown below extracts custom animation detais like type of animation , duration , animation order etc

Wednesday, February 22, 2012

How to open a file from C# ?

This example demonstrates how to open file with an associated program. It shows,

how to open a file and how to open url address in a default web browser.In c#

files are opened using Process.Start method .

// open a file

System.Diagnostics.Process.Start(@"c:\letter.pdf");

//Open a URL in default browser

System.Diagnostics.Process.Start("http://snippets4you.blogspot.com");

Saturday, February 18, 2012

How to call C# com from Java Script ?

This code snippets helps you to create a c# com and call fuction in c# com from javascript code .Add a reference runtime.InteropServices.Note that this code only works with internet explorer.

C# COM :

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace TestCOM
{

[Guid("F7B3192E-8B84-4cf0-9162-95166783299A")]
public interface COM_Interface
{
int disp(int aa);
}

[Guid("879A7994-1FE9-4379-8F84-C135B59B5C4B"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
public interface COM_Events
{

}

[Guid("E723167E-2244-4c9d-9681-F2E2108E49D3"),
ClassInterface(ClassInterfaceType.None),
ComSourceInterfaces(typeof(COM_Events))]
public class COM_Class : COM_Interface
{
public int disp(int aa)
{
return aa + 2;

}
}
}

Java script code :

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> CSHARP COM TEST </TITLE>
<script type='text/javascript' language='javascript'>

function comFunction()
{

try
{
var myobject;
myobject = new ActiveXObject("TestCOM.COM_Class");
alert(myobject.disp(2)); // Call DLL function here.
}
catch(e)
{
alert(e.message);
}

}

</SCRIPT></HEAD>
<BODY>
<INPUT TYPE=button value=DLL onClick="comFunction()">
<br>
</BODY>
</HTML>

Wednesday, February 8, 2012

How do I send mail using C# ?

The following example demonstrates sending a simple text email :

private void buttonX1_Click(object sender, EventArgs e)
{
string strFrom, strTo,strFeedback;
try
{
System.Net.Mail.MailMessage objMailMessage = new System.Net.Mail.MailMessage();

strFrom = textBoxX2.Text;
strFeedback = richTextBox1.Text;
objMailMessage.To.Add("jakesully25@gmail.com");
objMailMessage.From = new System.Net.Mail.MailAddress(strFrom);

objMailMessage.Subject = "HTML5Point";
objMailMessage.Body = strFrom+" : "+strFeedback;
objMailMessage.Priority = System.Net.Mail.MailPriority.High;
System.Net.Mail.SmtpClient objSmtpClient = new System.Net.Mail.SmtpClient("smtp.gmail.com", 587);
objSmtpClient.EnableSsl = true;
objSmtpClient.Credentials = new System.Net.NetworkCredential("jakesully25@gmail.com","server123");
objSmtpClient.Send(objMailMessage);
MessageBox.Show("Feedback Sent");
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

Note : Add reference System.Net.dll

Saturday, January 28, 2012

Reading & Writing registry key using C#

Reading registry key :

try
{
RegistryKey registry = Registry.LocalMachine.CreateSubKey("SOFTWARE\\myKey");
if (registry != null)
{
MessageBox.Show(registry.GetValue("myValue").ToString());
registry.Close();
}
}
catch (Exception ex)
{
MessageBox.Show (ex.ToString());
}

Writing registry key :

try
{
RegistryKey registry = Registry.LocalMachine.CreateSubKey("SOFTWARE\\myKey");
if (registry != null)
{
registry.SetValue("myValue", "myReturnValue");
registry.Close();
}
}
catch (Exception ex)
{
MessageBox.Show (ex.ToString());
}