C#

Giorgi Dalakishvili wrote:

How can a file be in use if you are creating it?

using System;
using System.ComponentModel;
 
namespace YourNamespace
{
	public class ReadOnlyCheckBox : System.Windows.Forms.CheckBox
	{
		/// <summary>
		/// constructor (empty)
		/// </summary>
		public ReadOnlyCheckBox()
		{
		}
 
		private bool _readonly = true;
 
		/// <summary>
		/// This property enables/disables the functonality of the control
		/// </summary>
		[Category("ReadOnlySpecials")]
		[Description("This property enables/disables the functonality of the control")]
		[DefaultValue(true)]
		public bool ReadOnly
		{
			get
			{
				return _readonly;
			}
			set
			{
				if(value!=_readonly)
				{
					_readonly = value;
				}
			}
		}
 
		protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)
		{
			//base method is only called,if ReadOnly is "false"
			if(!ReadOnly)
				base.OnMouseDown (e);
		}
	}
}

protected override void OnKeyPress(System.Windows.Forms.KeyPressEventArgs e)
{
    if(ReadOnly)
    {
        e.Handled = true;
    }
    base.OnKeyPress (e);
}

 private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            string p = "C:\\a.bmp";<br />
            Image img = Image.FromFile (p);<br />
            pictureBox1.Image = img;<br />
            MessageBox.Show ("Image added.");<br />
            img.Dispose ();<br />
<br />
            if ( !CheckIfFileIsBeingUsed (p) )<br />
            {<br />
                System.IO.File.Delete (p);<br />
                MessageBox.Show ("Image deleted.");<br />
            }<br />
            <br />
        }<br />
        public bool CheckIfFileIsBeingUsed(string fileName)<br />
        {<br />
             System.IO.FileStream fs;<br />
            try<br />
            {<br />
<br />
                fs = System.IO.File.Open (fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.None);<br />
                fs.Close();<br />
            }<br />
            catch ( Exception exp )<br />
            {<br />
                Console.WriteLine (exp.Message);<br />
                return true;<br />
            }<br />
            return false;<br />
<br />
        }

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.

this.pictureBox1.Image.Dispose();
System.IO.File.Delete(path);

aravinda777 wrote:

What's the best way to do this apart from checking the extensions?

Christian Graus wrote:

Use GDI+ to attempt to load a file and verify if it's an image.

Christian Graus wrote:

rite code that reads the file itself and attempts to identify the file format, which means you need to look for unique markers for each of these file types, and look for them.

unique markers

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.

Michael Sync wrote:

but what about other extension (eg: doc)?

Michael Sync wrote:

I'm not clear about that. Could you please explain me again?

Michael Sync wrote:

like ??

Christian Graus wrote:

Exactly as I said

Christian Graus wrote:

I have no idea, I'm not the one with the issue.

Christian Graus wrote:

You'd have to know that the file format contains the word 'WORD' in the first four bytes, for example, and open the file and examine it for those known markers related to the known file format.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.

Michael Sync wrote:

ut i think that checking the extension might be more easier than checking the fist four bytes of each file, isn't it?

aravinda777 wrote:

i handled identifying non-images

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you.