Re: to create a video file from a list of bitmap picture files in C sharp - C# Discussion Boards

Re: Windows 7: Getting The 'preview' file icon

13-Oct-11 13:11

Hi,
I'd like to get access to file icon of any application. The Problem is, I'd like to have the one which has been generated as preview (Like a icon of a pptx (PowerPoint) file which is the first slide or like a video which has the first frame as icon).

Does anyone know how to access these kind of icons?

Ravi Bhavnani13-Oct-11 16:17

Ravi Bhavnani

13-Oct-11 16:17

Using the Windows API Pack[^], you can do:

Image img = ShellFile.FromFilePath(@"C:\foo.pptx").Thumbnail.BitmapSource;

/ravi

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Re: Windows 7: Getting The 'preview' file icon

Michael Handschuh13-Oct-11 21:12

Re: Windows 7: Getting The 'preview' file icon

13-Oct-11 21:12

Thank you very much. Only thing about your code is, that you can't cast a BitmapSource to a Image.
So I changed the code to this:

Image img = ShellFile.FromFilePath("C:\\foo.pptx").Thumbnail.Bitmap;

Ravi Bhavnani14-Oct-11 1:40

Ravi Bhavnani

14-Oct-11 1:40

Sorry for the hasty typing!

/ravi

My new year resolution: 2048 x 1536
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Very basic OOP question

SFORavi13-Oct-11 12:40

13-Oct-11 12:40

I have a simple Employee Class as follows:

I want to create a new Employee object from a different Class having Main

Can I return the Complete Employee object from here when Main class uses GetEmployee method.

The code below errors out saying variable e in last method below is undefined

namespace TestEmployee
{
    class Employee
    {

        int eId;
        string eName;
        double age;

        public Employee(int i, string n, double a)
        {
            eId = i;
            eName = n;
            age = a;
        }

        public Employee()
        {
            eId = 1105;
            eName = "Peter Cava";
            age = 32 ;
        }

        public Employee GetEmployee()
        {
            Employee e;


            e.eId = this.eId;
            e.eName = this.eName;
            e.eId = this.eId;

            return e;
        }

    }
}

PIEBALDconsult13-Oct-11 12:43

PIEBALDconsult

13-Oct-11 12:43

Employee e <big>= new Employee()</big>;

(Though I don't know why you're cloning the Employee.)

Michael Handschuh13-Oct-11 13:14

13-Oct-11 13:14

If you want to create a new employee from your main method you should just use:

Employee myEmployee = new Employee();

if you really want to have a cloned object you should have a look at the Interface ICloneable for implementing the right methods.

SFORavi13-Oct-11 13:36

13-Oct-11 13:36

thanks for the reply

I did create a new Employee Object

class Employee
    {

        int eId;
        string eName;
        double age;

        public Employee(int i, string n, double a)
        {
            eId = i;
            eName = n;
            age = a;
        }

        public Employee()
        {

        }

        public Employee GetEmployee()
        {
            Employee e = new Employee();

            e.eId = this.eId;
            e.eName = this.eName;
            e.age = this.age;

            return e;
        }

    }

and calling this from a form where I give the 3 inputs and want to see it in new set of fields

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

        private void button1_Click(object sender, EventArgs e)
        {


            int i1 = Convert.ToInt32(textBox1.Text);
            string nm = textBox2.Text;
            double d2 = Convert.ToDouble(textBox3.Text);

            Employee em = new Employee(i1, nm, d2);

            em.GetEmployee();

          // Iam stuck on how to get the individual fields and display in separate box below.

            textBox5.Text = em.GetEmployee??  for Employee id from em object
            textBox6.Text = em.GetEmployee??  for Employee name from em object
            textBox6.Text = em.GetEmployee??  for Employee age from em object 





        }

Michael Handschuh13-Oct-11 13:51

13-Oct-11 13:51

Well the problem is that all your variables in the employee class don't have public, or private set. In that case they will be private and only be seen within the class Employee.

To manage that the correct way, C# offers you the posibility to create so called "Properties".

I've created properties as you see in the code of the class.

public class Employee
{

// This is another example of writing properties
/*
        private int eId;
        private string eName;
        private double age;

        public int EId
        {
           get{return eId;}
           set{eId = value;}
        }

        public string EName
        {
           get{return eName;}
           set{eName= value;}
        }

        public int Age
        {
           get{return age;}
           set{age= value;}
        }
*/
        // Properties
        public int EId{get;set;}
        public string EName{get;set;}
        public double Age{get;set;
 
        public Employee(int i, string n, double a)
        {
            eId = i;
            eName = n;
            age = a;
        }
 
        public Employee()
        {
 
        }
}

In the Form1 class you can access the properties pretty simple by creating a new Employee with Employee em = new Employee();
and access each property like: em.Name

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
 

            int i1 = Convert.ToInt32(textBox1.Text);
            string nm = textBox2.Text;
            double d2 = Convert.ToDouble(textBox3.Text);
 
            Employee em = new Employee(i1, nm, d2);
 
 
          // Iam stuck on how to get the individual fields and display in separate box below.

            textBox5.Text = em.EId.ToString();
            textBox6.Text = em.EName;
            textBox6.Text = em.Age.ToString();
        }

Hope this helps.

SFORavi13-Oct-11 14:02

13-Oct-11 14:02

Oh My, cant believe I dropped the ball on private and public declaration.

Thanks very much for the details and how to use the properties.

One last question please

in the Employee class, if I have to return as an object I need to have a variable of the class and do a new, right like in

Employee e = new Employee();

in code below.

SQL

class Employee
    {

        public int eId;
        public string eName;
        public double age;

        public Employee(int i, string n, double a)
        {
            eId = i;
            eName = n;
            age = a;
        }

        public Employee()
        {

        }

        public Employee GetEmployee()
        {
            Employee e = new Employee();

            e.eId = this.eId;
            e.eName = this.eName;
            e.eId = this.eId;

            return e;
        }

Not Active13-Oct-11 15:28

Not Active

13-Oct-11 15:28

You should not expose the class variables as public. Rather good design uses property accessors. That way any logic that may need to be executed when a property is set or accessed will be executed.

You don't always need an instance of a class to access it's properties or methods.

public class Employee 
{
   private static int m_Id;

   public static Foo()
   {

   }

   public static int Id{get; set;}
}

int id = Employee.Id;
Employee.Foo();

Static methods and properties are not bound to an instance of a class. The Factory pattern quite often uses this to create instances

public class Employee
{
   public static Employee CreateEmployee()
   {
      return new Employee();
   }
}

Employee e = Employee.CreateEmployee();

No comment

SFORavi14-Oct-11 8:00

14-Oct-11 8:00

Thanks very much Mark and Bob for the response. I think I am slowly getting it.

Thanks, Ravi

BobJanova13-Oct-11 22:19

BobJanova

13-Oct-11 22:19

I don't understand what the purpose of GetEmployee is. It is functionally doing a clone but that seems to be unnecessary.