Regular expression help - C# Discussion Boards

Peter Vertes12-May-05 4:22

12-May-05 4:22

Detecting objects in a photograph is a challenge. Do a search for "Computer Vision" or talk to your Computer Science professor at your local university to see how complex a field this is. Unfortunately I can't think of a simple way of doing this.

Reliable compression .net library

Anonymous11-May-05 5:58

Anonymous

11-May-05 5:58

Does anyone know any reliable compression library for .net ? Tried to use SharpZlib without success (too much CRC errors)... I tryed managedzlib as well. If anyone know a good library (or a way to call the good and old unmanaged zlib from managed enviroment), please let me know.

Re: Reliable compression .net library

Mauricio Ritter11-May-05 6:00

Mauricio Ritter

11-May-05 6:00

Just for the record, this post is mine (I tought I was logged on when I posted).

Mauricio Ritter - Brazil
MSN: mauricioritter(atsign)hotmail.com

English is not my native language so, if you find any spelling erros in my posts, please let me know.

Re: Reliable compression .net library

leppie11-May-05 6:39

leppie

11-May-05 6:39

Look at my libbz2 article. bz2 is one of the few unix apps that compile very cleanly across platforms. Havent had problems. I use the byte[]->byte[] de/compression mostly though.

http://www.codeproject.com/managedcpp/bzipstream.asp[^]

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C# and Web Cams

McArco11-May-05 5:48

McArco

11-May-05 5:48

Hi everyboy,

I am now developing a piece of software to interact with a web cam. I have already found some examples of web cam accesses, but I would like to know how to access the configuration of the webcam.

It is important for my project to be able to have control of the acquisition of the pictures. Any idea?

McArco
Newbie in C#

Urgent Regular expression help

Dot Net11-May-05 5:37

Dot Net

11-May-05 5:37

Hi,
I'm writing a service which would extract plain text between HTML tags. e.g <td>Some text</td>
It will extract all tags like this. Iam using following regular expression

Pattern = ">\w+[^<]+<"
It tries to extract only those tags which contain only plain text and on other.
This regular expression is not working fine and does not extract all tags e.g it misses <title>My title</title>

I would appreciate if someone could help me. Its urgent.

Re: Urgent Regular expression help

leppie11-May-05 6:42

leppie

11-May-05 6:42

remove the \w+

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Regular expression help

Dot Net11-May-05 5:36

Dot Net

11-May-05 5:36

Hi,
I'm writing a service which would extract plain text between HTML tags. e.g Some textIt will extract all tags like this. Iam using following regular expression

Pattern = ">\w+[^<]+<"
It tries to extract only those tags which contain only plain text and on other.
This regular expression is not working fine and does not extract all tags e.g it misses <title>My title

I would appreciate if someone could help me. Its urgent.

Re: Regular expression help

DavidNohejl11-May-05 5:57

DavidNohejl

11-May-05 5:57

What about "<.*?>([^<>]*)</.*?>" ?

But I quite don't understand your example with <br><br> ...

David

p.s try check "do not threat <'s as HTML tags" or escape every < and > in text

controling items in a dialog from another dialog

Green Fuze11-May-05 4:21

Green Fuze

11-May-05 4:21

Hey everybody!

I created 2 forms, the MAIN form and SECOND form.

the SECOND form has a text box (tbTEXT), and I want to use that text (tbTEXT.text) in the MAIN form.

the question is how do I tell C# to address that item (tbTEXT) from the MAIN form?

or if I will put it in a more general way, how can I control variables (or items) in one form from another? Confused | :confused:

THANKS!

Re: controling items in a dialog from another dialog

S. Senthil Kumar11-May-05 7:29

S. Senthil Kumar

11-May-05 7:29

A Form is just another class. You can expose a property in the second form. You can store a reference to the second form in main form and then use the property to manipulate tbText. Something like

class SecondForm
{
   private TextBox tbText = new TextBox();
   
   public string TbText
   {
       get { return tbText.Text; }
       set { tbText.Text = value; }
   }
}

class MainForm
{
  SecondForm secondForm;

  public void ShowSecondForm()
  {
     secondForm = new SecondForm();
     secondForm.Show(); // or ShowDialog
  }

  public void SetText(string text)
  {
     secondForm.TbText = text;
  }
}

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

File Types Editor in Setup project (Visual Studio)

WujekSamoZlo11-May-05 4:06

WujekSamoZlo

11-May-05 4:06

Does anybody know a web site which would explain the actions, verbs and other properties to fill in the FileTypes editor? In searched in MSDN but there are just simple tutorials like "How to add new file document".

Winform User Controls

skrishnasarma11-May-05 3:35

skrishnasarma

11-May-05 3:35

Hi
I wand to develop a tri state Check listed box (That allows tickboxs to be in three states: ticked, unticked and crossed.) for a win form application.

There is no such control in the .Net,
shall any one suggest how to do or shall I get any sample code for the same.

Regards

Graphics In C#

liormin11-May-05 3:34

liormin

11-May-05 3:34

Hello, i need your help.
I have painted a circle inside my form and when I minimized it, it disapeared... in vb6 when I'm using PictureBox , I have an option called
"AutoRedrawe", how can I set it here, in c#?

Confused | :confused:

Re: Graphics In C#

S. Senthil Kumar11-May-05 4:04

S. Senthil Kumar

11-May-05 4:04

You could always store the objects in some data structure and draw them on the screen everytime it paints itself.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Graphics In C#

Polis Pilavas11-May-05 4:20

Polis Pilavas

11-May-05 4:20

C# does not support the VB6 behaviour. It's not a good practice to draw upon the existing graphics of any control. Follow this link[^]for the answer to your problem.

Regards,
Polis

Can you practice what you teach?

Re: Graphics In C#

Snowjim11-May-05 7:02

Snowjim

11-May-05 7:02

You will have to repaint the circel every time the control is repainted, this is simply done by using a override OnPaint method or likewice.

Best Regards
SnowJim

Design problem

Pedro S Ferreira11-May-05 3:22

Pedro S Ferreira

11-May-05 3:22

Hi,

I'm working in a class library project and I'm trying to design the code in the best way possible.

I have an abstract class that represents the header of one file defined like this:

<br />
public abstract class FileHeader<br />
{<br />
 // +/- 10 private fields with header information<br />
<br />
  protected FileHeader()<br />
  {<br />
  }<br />
<br />
 //Readonly properties for all private fields<br />
<br />
 public abstract void Open(string filePath);<br />
}<br />

Now the question is:

My header class should be readonly (cannot set properties values from outside), but my derived classes should be able to set the fields in their implemetation of Open method.
According to the Design Guidelines for Class Library Developers from MSDN, we shouldn't leave protected fields in base classes, so the only way I can see is to add a protected method to set each field... and that don't sounds good...

Could anyone give me some ideas here?

Thanks! and sorry for the long post Big Grin | :-D

Re: Design problem

S. Senthil Kumar11-May-05 3:59

S. Senthil Kumar

11-May-05 3:59

I've felt the same problem too. It would have been nice if we were able to specify different access specifiers for set and get. If that was possible, you could've declared get as public and set as protected.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

My C# App Protection

Member 271608811-May-05 2:33

Member 2716088

11-May-05 2:33

Help....

I've written a great little C# app which I want users to download from the internet. But I need to do the following and would appreciate help...

1) I want users to be able to download an 'unregistered' product which is time-limited.
2) At any time, the user can register on my web-site and then receive an unlock key which gives them unlimited access
3) Any updates they download will not require re-registration/unlocking

Can anyone point me to a good product that will allow me to integrate this protection into my app?

Thanks

Mark

Re: My C# App Protection

Robert Rohde11-May-05 5:38

Robert Rohde

11-May-05 5:38

Hi,

have a look at Xheo. If the costs arent too high for you you will get a very sopphisticated licensing tool. But keep in mind that .Net programs are in general easy to decompile. Thus you always have to obfuscate your libraries to make it at least a bit harder for professionals to crack this Smile | :)

Re: My C# App Protection

Member 271608811-May-05 5:49

Member 2716088

11-May-05 5:49

Robert...

Great...

Thanks

Which is the fastest pattern matching algorithm

tommazzo11-May-05 2:09

tommazzo

11-May-05 2:09

Hi!

I'm looking for a way to find the position of a certain pattern within a string. On my search on the internet I've come accross various algorithms such as Knuth-Morris-Pratt and Boyer-Moore (just to name two). But which is the fastest?

Re: Which is the fastest pattern matching algorithm

leppie11-May-05 6:47

leppie

11-May-05 6:47

IIRC, BM is optimal for long input string + long search string. A common place to apply this is in a text editor's Find function. BM is realy simple to implement, and works well for most cases.

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Re: Which is the fastest pattern matching algorithm

tommazzo12-May-05 9:47

tommazzo

12-May-05 9:47

Thanks a lot! I'll give it a try.

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