C# Discussion Boards - CodeProject

Btrieve Database

Jassim Rahma12-Jan-03 0:14

Jassim Rahma

12-Jan-03 0:14

Can anyone tell me how can I access Btrieve database using C#?

Many Thanks,

Jassim Rahma

Regex and accents

Rome Singh11-Jan-03 9:52

Rome Singh

11-Jan-03 9:52

I'm using Regex to identify if a token is alpha [a-zA-Z] but it will not recognize french accents like É, Ô ... Does anyone know what the expression should be?

Re: Regex and accents

Nathan Blomquist11-Jan-03 10:08

Nathan Blomquist

11-Jan-03 10:08

You will need to include the character codes for those accented characters in your Regex. I don't know what they are but you should be able to look them up.

The Regex is just matching characters a through z and A through Z. It does not know anything about those accented characters until you add them to the expression.

Hope this helps,
Nathan

---------------------------
Hmmm... what's a signature?

Re: Regex and accents

Daniel Turini11-Jan-03 10:24

Daniel Turini

11-Jan-03 10:24

Did you try the \w (lower case!) expression?

I see dumb people

Re: Regex and accents

Rome Singh11-Jan-03 10:35

Rome Singh

11-Jan-03 10:35

I did but something like 34A returns alpha. That not what I want. I have another regex checking for alphanumeric.

Re: Regex and accents

Nathan Blomquist11-Jan-03 11:27

Nathan Blomquist

11-Jan-03 11:27

I think I figured it out, at least if I understand you correctly.

You can look at this Ascii table[^].

So to match those characters you need to enter in the extended ascii codes. You can do this in windows by holding down alt and typing the 3 digit ascii codes on the numpad.

Example:
É = alt + 144 <must be="" on="" the="" numpad="">

So then to get a range of these characters do:

[a-zA-ZÉ-ô]

I don't know exactly what characters you need, so you will have to enter them yourself. The alt + combination doesn't seem to work in Internet Explorer, but it does work in Visual Studio on WindowsXP English.

Hope this help clarify more,
Nathan

---------------------------
Hmmm... what's a signature?

Re: Regex and accents

Rome Singh11-Jan-03 14:05

Rome Singh

11-Jan-03 14:05

Entering the range Ã-ÿ does seem to work. The ASCII table in your link seems to be code page 850 (American). If you bring up the character map, under Accessories, you can see the values for those characters (Windows code page which I think is 1252??)

The problem is that I will be parsing data from databases. With databases you can specify the code page to use. This would cause a problem with using the range you specified. I found a few links

http://www.unicode.org/reports/tr18/
http://www.microsoft.com/mspress/books/sampchap/5957.asp

There is a [/p{Greek}] and a few other languages but no French.

I'll try your solution for now.

Thanks,

Rome

Ideas for a Server Monitor ??

Dato11-Jan-03 7:29

Dato

11-Jan-03 7:29

I would like to build a server monitor in C#. Anyone have any good ideas ? I know checking the server is still running can be done w/ Ping.

What about the FTP service ?
What about the web server ? ( Sure we can do this w/ WebRequest Obj. and just look for a string but is there a better way ??)

Anyone ?

Remoting Collections

billb211210-Jan-03 18:38

billb2112

10-Jan-03 18:38

I have a custom collection that I built that contains strings, doubles and datetimes. When I try and retrieve that collection from the server I get the following error:
"The type BarCollection in Assembly, Version=1.0.1106.204, Culture=neutral, PublicKeyToken=null is not marked as serializable."

I've derived from CollectionBase and implemented my Add and an indexer (strongly typed). The collection contains a structure that contains the aforementioned strings, doubles and datetimes. I've declared it as [Serializable].

<br />
[Serializable]<br />
public class BarData<br />
{<br />
  public DateTime BarDateTime;<br />
  public string BarName;<br />
  public double d1;<br />
  public double d2;<br />
  public double d3;<br />
}<br />

and here's a snippet of my collection

<br />
public class BarCollection : CollectionBase<br />
{<br />
  public void Add(BarData bar)<br />
  {<br />
    List.Add(bar);<br />
  }<br />
<br />
  public BarData this[int Index]<br />
  {<br />
    get<br />
    {<br />
      return (BarData)List[Index];<br />
    }<br />
    set<br />
    {<br />
      List[Index] = value;<br />
    }<br />
  }<br />
}<br />
<br />
...<br />

I assume the problem is with the non string members, but what else do I need to do to get this sucker over the wire?

Thanks.

Give me one more medicated peaceful moment

Re: Remoting Collections

leppie10-Jan-03 23:19

leppie

10-Jan-03 23:19

CollectionBAse is already Serializable, but maybe you need to declare an extra Serializable attribute to BArCollection

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Remoting Collections

billb211211-Jan-03 5:02

billb2112

11-Jan-03 5:02

Right above my class definition for BarCollection I have the [Serializable] attribute. Do I need to do something else?

Give me one more medicated peaceful moment

Re: Remoting Collections

leppie11-Jan-03 5:11

leppie

11-Jan-03 5:11

Two suggestions

1. Have you tried passing it as a Array instead?
2. Add BarCollection into "container" class.

Another thing to look for is the is what property caused the exception. That you should see before the stacktrace.

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Remoting Collections

billb211211-Jan-03 5:49

billb2112

11-Jan-03 5:49

Thanks for the suggestions, however, I figured out the problem. Yes, BarData had to be marked as serializable, but even though BarCollection is derived from CollectionBase which is supposedly already serialized, I still have to add the [Serializable] attribute above that class as well.

This is probably something that is glaringly obvious to anyone that knows anything about remoting ... but did I mention that this is the first day that I've tried it? Big Grin | :-D

Thanks for the replies!

Give me one more medicated peaceful moment

track bar int too double ?

jtmtv1810-Jan-03 13:22

jtmtv18

10-Jan-03 13:22

whats the easyest way too adjust a track bar value from 1 too 100, into a double starting at 1.0 and working its way down to .0001 (for form opacity).
i have it working with a huge switch, but i want a cleaner way to take the int value of say 100 too the double value of .0001

Re: track bar int too double ?

David Stone10-Jan-03 13:39

David Stone

10-Jan-03 13:39

form.Opacity = (double)trackBar.Value / 1000000;

I think that should work... Unsure | :~

I don't know whether it's just the light but I swear the database server gives me dirty looks everytime I wander past.
-Chris Maunder

Microsoft has reinvented the wheel, this time they made it round.
-Peterchen on VS.NET

Re: track bar int too double ?

jtmtv1810-Jan-03 14:10

jtmtv18

10-Jan-03 14:10

thanks alot =) you just gave me back 200 lines of code i bet.. (it looks like that would work too me too...)

im going too school as we speak to get my mcsd from a microsoft certified school.. for someone trying to become a windows app programmer (eventually games) is this a good start ?

Re: track bar int too double ?

David Stone11-Jan-03 5:57

David Stone

11-Jan-03 5:57

Actually, I would look at this article instead. It seems to work:

http://www.codeproject.com/csharp/transparentwindowsincsharp.asp[^]

I think Game Dev would be better done in C++. You can do it in C#, but I haven't really seen a game written in C# aside from Chris Sells' Wahoo[^]

Re: track bar int too double ?

stephen woolhead10-Jan-03 15:32

stephen woolhead

10-Jan-03 15:32

That will not work...

1 = 0.000001
100 = 0.0001

Depends if you want a linear function or a power function see

http://www.perfectphase.com/store/slider.gif[^]

Stephen.

Re: track bar int too double ?

David Stone11-Jan-03 5:58

David Stone

11-Jan-03 5:58

You're right. I should have just done this:

Form.Opacity = trackBar.Value / 100;

Aborting updates in a DataTable

stephen woolhead10-Jan-03 12:43

stephen woolhead

10-Jan-03 12:43

I am having a problem with aborting updates in a DataTable.

I am hooked into the RowChanging Event and, as the docs say, throwing an exception to cause the update to abort.

My problem is that the DataSet does not catch this exception and it bubbles all the way up to Main() which is a bit to late to do anything with.

For this example I have a single form with a ListBox and a TextBox bound to a strongly typed DataSet.

Anyone know how to handle this situation

Thanks

Sttephen.

Re: Aborting updates in a DataTable

jtmtv1810-Jan-03 13:28

jtmtv18

10-Jan-03 13:28

could you try butting your listbox on a seperate thread and abort the thread ? or maybe try putting the update in a while statement with a bool.... ie.
it would be a pain too do it with the while statement though cause it would stay in it until the update tells it not too. i would try threads.

while(turnOffUpdateflag==false)
{
;//do my update
}

while(myThread.IsAlive == true)
{
;//do update
}

Re: Aborting updates in a DataTable

stephen woolhead10-Jan-03 13:57

stephen woolhead

10-Jan-03 13:57

<shudder>

There as to be a better way!

I am trying to validate the row when the list changes to a different row. This triggers the RowChanging event from the dataset. If I create the ListBox on another thread, when I abort the thread, surely I would lose the list box as well, and would have to recreate it and restore it to it's current state.

15 minute project has now managed to waste the best part of a day!!

This looked so simple when I read the docs. LOL, should have known better by now! Wink | ;-)

Stephen.

Re: Aborting updates in a DataTable

jtmtv1810-Jan-03 14:19

jtmtv18

10-Jan-03 14:19

i have a encryption program with the encryption method....the recursive file search method..all running on a string... when the user clicks stop..... it cancels the threads ..and the results that were found before the thread stopped are still in the list box... then when the user clicks the search button agian i tell the program too recreated the thread agian and it startes over

any time you abort a thread you have to reintialize it ie
make a private void just for your threads so you can call on then and get them reintialized when ever needed.
i have never used a datagrid before (isnt that what you are using? cant remeber) but this has always worked for listboxes atleast.

private void mylistboxThread()
{
Thread Update = new Thread(new ThreadStart(updatefunctions))
}

private void updateFunctions()
{
//put your update code here.
}

Update.Start();//start thread
Update.Abort();//abort thread

jesse m Smile | :)

Re: Aborting updates in a DataTable

stephen woolhead10-Jan-03 15:42

stephen woolhead

10-Jan-03 15:42

But you are in control of starting the thread. What I want to do is in response to a users click on the listbox, which will be triggered from an incoming windows message (WM_MOUSE_DOWN or what ever) via the forms message loop that is running on the forms main thread, therefor my thread of execution would never make it onto my thread.

Make sense?

Stephen.

Version number in deployment app

Bog10-Jan-03 12:24

Bog

10-Jan-03 12:24

I'm making a deployment msi in VS.net, and I want to make the registry entry for the app be:

HKEY_CURRENT_USER
Software
[Manufacturer]
[ProductName]
v[Version]
myvariablehere

what happens is, Manufacturer and ProductName get replaced as they should, but version just gets "v" without the version number after it. I also tried just "[Version]" but that didn't work either. Am I doing something wrong or can you not write the version into the name?

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-Groucho Marx

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