Re: generating random dummy files - C# Discussion Boards

17-Dec-07 9:10

You could always override the PostFilterProperties method and remove the base properties.

protected override void PostFilterProperties(IDictionary props)
{
  props.Remove("Text");
}

Deja View - the feeling that you've seen this post before.

Re: remove property from inherited control

Eli Nurman17-Dec-07 9:21

Eli Nurman

17-Dec-07 9:21

Thanks

generating random dummy files

Shani Aulakh17-Dec-07 5:23

Shani Aulakh

17-Dec-07 5:23

Hi All,

Can anyone help me with a method that could generate random dummy files with extensions..(.txt, .log, .exe) in a specified folder?

Kristian Sixhøj17-Dec-07 5:44

Kristian Sixhøj

17-Dec-07 5:44

Look at the System.IO.File.Create() method.

http://msdn2.microsoft.com/en-us/library/system.io.file.create.aspx[^]

Kristian Sixhoej

"Failure is not an option" - Gene Kranz

m@u17-Dec-07 5:46

m@u

17-Dec-07 5:46

what's the folder's name? "My Homework"?

Shani Aulakh17-Dec-07 5:50

Shani Aulakh

17-Dec-07 5:50

Folder name could be anything...doesn't matter i can change that :P
I have the following code..

private void button1_Click(object sender, EventArgs e)
{
StreamWriter outStream = null;
string filename = "output.txt";
string message = null;

try
{
outStream = new StreamWriter(filename);
outStream.WriteLine("Hello World");
outStream.Close();
MessageBox.Show(filename);
}
catch (IOException e1)
{
message = "Unable to create " + filename + "\r\n";
message += String.Format("Reason: {0}", e1.Message);
MessageBox.Show(message);
return;
}
message = ("File successfully created");

}

But, this just creates one txt file...Basically, right now I am working with windows application...I have written a program that can delete files from s specified folder older than X number of days, hrs, mins respectively..it works fine..But, i want to test this code thoroughly on a 'dummy' folder before ilet it loose on real data as deleting files in bulk makes me nervous! So, for that i want to create a method that would generete files for me with different extensions...files dont have to be empty... I know i can use for loop to create more files using my own code. But, I am just not sure how I am going to create files with different filter.

Also, The problem with the dummy files is to get a decent spread of 'last modifed' times and i think the only practical way to achieve that is copy existing files from another folder which can be done programatically using File.Copy(). I suppose i could augment these by creating new files programatically with any extension i like and save them to disk using the StreamWriter class.

But, I just want to use a different approach here and see if it actually works

m@u17-Dec-07 6:05

m@u

17-Dec-07 6:05

Ok
you could put the extensions you want to create into an array and then use System.Random class to use a random Extension
private string[] myExtensions[] = new string[]{"exe","txt","log","jpg","bmp"/*,...*/}

to avoid the IOException saying "the file already exists" you could use a timestamp that is added to the Filename

string myFileName = string.Format(@"{0}\someName_{1}.{2}",someFolder,System.DateTime.Now.Ticks,randomExtension);<br />
<br />
and finally, if you want to manipulate the Creation/Modification - Dates of a file, take a look at the <code>System.IO.FileInfo

Class

greets
M@u

Shani Aulakh17-Dec-07 7:19

Shani Aulakh

17-Dec-07 7:19

Thanks m@u.
I can try what you said, But i think its much easier to get it done.
I think i can do it the following way. Files are getting created in the executable path of windows application project. I want to give out my own path. how do i do that?

private void button1_Click(object sender, EventArgs e)
{
StreamWriter outStream = null;
string message = null;

for (int i = 0; i < (10000); i++)
{
string filename = "output";
filename += i.ToString();

if (i % 3 == 0)
{//multiple of three
filename += ".txt";
}
else if (i % 5 == 0)
{//multiple of 5
filename += ".log";
}
else
{
filename += ".dat";
}

try
{
outStream = new StreamWriter(filename);
outStream.WriteLine("Hello World");
Thread.Sleep(60000);
outStream.Close();
}
catch (IOException e1)
{
message = "Unable to create " + filename + "\r\n";
message += String.Format("Reason: {0}", e1.Message);
MessageBox.Show(message);
}
}

Luc Pattyn17-Dec-07 8:06

Luc Pattyn

17-Dec-07 8:06

two comments:

1. that is NOT random at all

2. always show the entire exception, not just it's message part; you may miss essential info.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Sorry for any delays in replying, I currently don't always get e-mail notifications.

Anonymous18-Dec-07 7:31

Anonymous

18-Dec-07 7:31

Yeah, you might want to use a RNG to generate random numbers, which could be used directly or indirectly as the filename. I recommend a Mersenne Twister, the classes for which are on the web.

I agree with No. 2 as well. Exceptions aren't always what they seem to be, so it's good to have any information you can get.

Mark Churchill17-Dec-07 13:58

Mark Churchill

17-Dec-07 13:58

Why don't you add a "move to archive" option? That would make your program more useful, and also make you less nervous Wink | ;)

Mark Churchill
Director
Dunn & Churchill
Diamond Binding: Zero to Data Layer in 3 mins

Jan R Hansen17-Dec-07 22:17

Jan R Hansen

17-Dec-07 22:17

you are re-inventing the wheel - check this CP article:

http://www.codeproject.com/KB/files/deleteold.aspx[^]

works briliantly Smile | :)

Do you know why it's important to make fast decisions? Because you give yourself more time to correct your mistakes, when you find out that you made the wrong one. Chris Meech on deciding whether to go to his daughters graduation or a Neil Young concert

johannesnestler20-Dec-07 1:22

johannesnestler

20-Dec-07 1:22

Hi,

Very nice Comments on that topic so far. Heres some program that does what you need:

using System;
using System.IO;

class Program
{
static void Main(string[] args)
{
CreateRandomFile(@"C:\");
}

static void CreateRandomFile(string folder)
{
Random rand = new Random();
string[] ext = new string[] { ".dat", ".txt", ".log" };
string filename = Path.Combine(folder,
String.Format("RandFile_{1}.{2}", folder, DateTime.Now.Ticks, ext[rand.Next(0, 3)]));
try
{
File.WriteAllText(filename, "This is a test file");
FileInfo info = new FileInfo(filename);
info.CreationTime = new DateTime(1999, 1, 1, 1, 1, 1);
info.Refresh();
}
catch(IOException) { /* Put Exception-Handling here */ }
}
}

Adding reference in runtime

Ari12310-Jan-08 3:39

Ari123

10-Jan-08 3:39

I would suggest a much simpler approach, using .NET Framework built-in classes...

using System;
using System.IO;

namespace RandomFileNames
{
class Program
{
static void Main(string[] args)
{
//choose any folder you like, I used MyDocuments
string folder = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

CreateRandomFiles(folder, 10);
}

static void CreateRandomFiles(string folderName, int numberOfFiles)
{
string[] extensions = { ".txt", ".exe", ".pdf", ".log", ".xls", ".doc" };
int count = extensions.Length;
string fileName;
Random random = new Random();

for (int i = 0; i < numberOfFiles; i++)
{
//this uses the static method GetRandomFileName()
//of the Path class
try
{
fileName = Path.GetRandomFileName();

//change the extension to one of your choice
fileName = Path.ChangeExtension(fileName, extensions[random.Next(count)]);

//create the final file name
fileName = Path.Combine(folderName, fileName);

//create the file itself
File.Create(fileName);
}
catch (Exception ex)
{
//handle exceptions here
}

}

}
}
}

Razizao17-Dec-07 4:03

Razizao

17-Dec-07 4:03

I have user control.
I wish to add some reference to user's project when the user put my control on his form.
I use VS 2005 C#.
Thank you.

Re: Adding reference in runtime

Pete O'Hanlon17-Dec-07 4:34

17-Dec-07 4:34

Razizao wrote:
I wish to add some reference to user's project when the user put my control on his form.

If you have compiled up your component into a DLL, then the reference is added for you automatically.

Deja View - the feeling that you've seen this post before.

Re: Adding reference in runtime

Razizao17-Dec-07 4:40

Razizao

17-Dec-07 4:40

its not what i ment.

I want to add another references, besides the control dll.

for example,
when the developer adding my control to his form,
i want to add 3 more references to my other dlls.

do u know how to do that ?

datagridview events

arkiboys17-Dec-07 3:40

arkiboys

17-Dec-07 3:40

What is/are the cell events that are fired After _cellformatting?
Thanks

How to resize .tiff image

sher_azam17-Dec-07 1:24

sher_azam

17-Dec-07 1:24

i have a tiff image with multipule pages in it.its size is 2650 x 3300 and i want to reduse it to 1728 x 2200. is there any way that i can reduse its size. please help me.

Pete O'Hanlon17-Dec-07 2:01

17-Dec-07 2:01

One way to do this could be:

public Bitmap ResizeBitmap(Bitmap b, int width, int height )
{  
  Bitmap result = new Bitmap( width, height );  
  using( Graphics g = Graphics.FromImage((Image) result ))
  {
    g.DrawImage( b, 0, 0, width, height );  
  }
  return result;
}

Deja View - the feeling that you've seen this post before.

sher_azam17-Dec-07 2:18

sher_azam

17-Dec-07 2:18

This code is working but there is no change in the file size. so how it will effect the file size and where it will be save the file with new size?

Pete O'Hanlon17-Dec-07 2:26

17-Dec-07 2:26

You would have to save the new version to change the file size.

Deja View - the feeling that you've seen this post before.

sher_azam17-Dec-07 19:35

sher_azam

17-Dec-07 19:35

yes. it changes the size and in result file there is only one image Frown | :(

while in original file there is a lot of images. so all the others are discard. what should i do to save them? how i can resize the file with all images? Confused | :confused: