Re: Need idea for a neural network... - C# Discussion Boards

Alex Korchemniy30-Oct-04 13:41

30-Oct-04 13:41

See System.Diagnostics.Process.Start.

Instead of making a mess with data returns why don't you dump the data into a file and read back from there?

The situation you are describing seems like a mess. Make sure your final solution is somewhat robust and reliable. Maybe use P/Invoke to instead of returning the data. Or maybe rewrite in c#?? Confused | :confused:

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Alex Korchemniy

Re: Executing a file from an interface

Kiran Satish31-Oct-04 7:13

Kiran Satish

31-Oct-04 7:13

Hi Alex,

thanks for ur suggestions and i did the same way as u told, like dumping the data into a file and then reading the data from it.

But i am having a problem, when the process is started using Process.Start, my calling program is not waiting for the called process to complete before it goes to next step of execution. So, i am having some inconsistent data file by tht time as the called process take some considerable time to complete.

Is there any command to make the calling program to wait untill the called process is comepleted.

thanks in advance,

Suman

Re: Executing a file from an interface

Alex Korchemniy31-Oct-04 9:23

Alex Korchemniy

31-Oct-04 9:23

Yes. Take a look at System.Diagnostics.Process. Method WaitForExit.

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Alex Korchemniy

Re: Executing a file from an interface

Kiran Satish31-Oct-04 9:49

Kiran Satish

31-Oct-04 9:49

Hi Alex,

yeah... i figured it out... sorry i forgot to delete my previous reply, since i figured it out after i posted the reply to you.
Anyway thanks for ur help.

Suman

Need idea for a neural network...

tom_dx30-Oct-04 10:52

tom_dx

30-Oct-04 10:52

one that will be fun to work out and get good or interesting results, or to make an existing one better, need the ideas since I can't really think of any at the moment, thanxs in advance Wink | ;)

;P:P;P

Re: Need idea for a neural network...

Alex Korchemniy30-Oct-04 11:01

Alex Korchemniy

30-Oct-04 11:01

Something that interfaces with a airplane simulator. The neural networks job would be to make sure the plane flies in all weather.

Something that interfaces with Counter Strike. The neural networks job would be a killing machine Poke tongue | ;-P

Alex Korchemniy

Re: Need idea for a neural network...

tom_dx30-Oct-04 11:17

tom_dx

30-Oct-04 11:17

something simpler since I don't have alot of time since I need to be almost finished with it in a month since I will have to do alot of work..

Re: Need idea for a neural network...

yoaz31-Oct-04 2:14

yoaz

31-Oct-04 2:14

navigating a maze? Smile | :)

there are no facts, only interpretations

How to get a string's encoding

Matt Gerrans30-Oct-04 9:52

Matt Gerrans

30-Oct-04 9:52

Given a particular string, is there a way to tell whether it contains unicode characters? I know could test every character's range, but I'm wondering if there is some API call for this. I'm looking in string, System.Text.Encoding, and Globalization, but haven't found any likely suspects yet...

Matt Gerrans

Re: How to get a string's encoding

Heath Stewart31-Oct-04 9:21

Heath Stewart

31-Oct-04 9:21

Strings in .NET are stored as Unicode. The encoding only matters when reading and write from and to streams (text files, network streams, etc.).

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Re: How to get a string's encoding

Matt Gerrans1-Nov-04 5:01

Matt Gerrans

1-Nov-04 5:01

I know that.

I'm adding lines to existing files. If the existing file is ASCII and I'm adding regular ASCII text, then everything's fine. However, if the line I'm adding has some Unicode characters (which may be the case), I want to change the file's encoding to Unicode and rewrite the thing out. (If the existing file is already Unicode, it is easy of course (except for this StreamReader bug that tells you it is UTF8)).

I've figured out how to do this aready, by going through all the characters and checking for any out of the 0-255 range, but I was wondering if there was an API call, or more idiomatic way of handling this.

Matt Gerrans

Re: How to get a string's encoding

Heath Stewart1-Nov-04 5:30

Heath Stewart

1-Nov-04 5:30

And why do you call it a bug? It sounds correct. UTF8 is an MBCS (multi-byte character set) that uses 7-bit characters as ANSI does, but 8-bit characters (i.e., the 8th bit is set) denotes Unicode codepoints. That's the beauty of UTF8 - it maintains backward compatibility so long as you don't use Unicode, and if you must it allows for that.

So, use the UTF8Encoding instead.

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Re: How to get a string's encoding

Matt Gerrans1-Nov-04 11:23

Matt Gerrans

1-Nov-04 11:23

It is incorrect if the file's BOM ("\xff\xfe") says it is Unicode (or UTF16) and the reader thinks it is UTF8 ("\xef\xbb\xbf"). So I call it a bug, because I think it is one. I've since noticed that if I use the StreamReader's string constructor, it correctly identifies it as Unicode, but if I use the FileStream constructor it mis-identifies it as UTF8. So if I do this with a Unicode encoded file:

void SomeMethod( FileInfo info )
{
   StreamReader reader = new StreamReader( info.OpenRead() );
   System.Text.Encoding encoding = reader.CurrentEncoding; // UTF8!?
   string data = reader.ReadToEnd();
   reader.Close();
   
   data = Massage(data);
   
   StreamWriter writer = new StreamWriter( info.OpenWrite(), encoding );
   writer.write(data);
   writer.Close();
}

I get a UTF8 encoded file as a result, which I don't want. On the other hand, if I do this:

void SomeMethod( FileInfo info )
{
   // Use the filename instead of OpenRead()):
   StreamReader reader = new StreamReader( info.FullPath );
   System.Text.Encoding encoding = reader.CurrentEncoding; // Unicode!
   string data = reader.ReadToEnd();
   reader.Close();
   
   data = Massage(data);
   
   StreamWriter writer = new StreamWriter( info.OpenWrite(), encoding );
   writer.write(data);
   writer.Close();
}

The file will be Unicode, as expected (and desired). Maybe the intermediate use of the FileStream causes the loss of the encoding?

Because these files are used by multiple platforms and programming languages (not all of which support MBCS), I want to simply use either ASCII or Unicode, but not UTF8 (or UTF7 or Unicode Big-Endian, etc.). I think there is not that much beauty in UTF8 (the "backward compatibility" also get hosed by use of extended ASCII characters, which usually comes from "backward" text files that were using drawing characters and the like), just unnecessary complexity, especially in these days of multi-gigabyte storage.

By the way, the original question was about detecting the presense of Unicode characters in a string (which, having 16-bit characters could contain some, or not); this would affect the case where the original file was ASCII, but a line with some Unicode characters were inserted into it. In that case, I just want to switch the whole file over to Unicode.

Matt Gerrans

Re: How to get a string's encoding

Heath Stewart1-Nov-04 11:37

Heath Stewart

1-Nov-04 11:37

You should use StreamReader reader = info.OpenText();. If you look at the IL, the code for opening a StreamReader from a stream vs. a filename is the same. The constructor which takes a string actually does the same thing you are - opens a FileStream and passes it to Init (an internal method which every constructor eventually calls).

As for your original question, see the StringInfo class defined in the System.Globalization namespace. This allows you to enumerate characters (derived from however many code points), which you could then determine if a string contains one character or more.

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Collection Class's

MrJJKoolJ30-Oct-04 5:24

MrJJKoolJ

30-Oct-04 5:24

Hi,

I noticed in a sample app source code that the app made use of a class for example a user class and then had the user objects that got created stuffed into a user collection. I was wondering why do they do this if the user object that was created existed for the life of the object why u would need a user collection? I would think u could just call the user object and get your info from that just as easily then going the extra step to put the user object into a user collection. What am I missing here?

What is the user collection giving me over just using the user objects that I can create by themselves? I hope I am explaining this correctly.

Thanks,

JJ

Re: Collection Class's

Colin Angus Mackay31-Oct-04 1:58

Colin Angus Mackay

31-Oct-04 1:58

MrJJKoolJ wrote:
user class
MrJJKoolJ wrote:
user objects
MrJJKoolJ wrote:
user collection

What is a "user" class, object or collection? Do you mean one that isn't part of the .NET Framework? For the rest of my reply I'll assume that is what you mean.

MrJJKoolJ wrote:
I would think u could just call the user object and get your info from that just as easily then going the extra step to put the user object into a user collection.

There are many reasons for putting objects into a collection despite the fact they will exist elsewhere. Mostly this is to do with ease of access in the other location, the ablility to iterate over the objects and perform the same operation on all of them, the ability to create a varying number of objects and still reference them and so on.

Do you want to know more?

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How can i change the Form title bar color

Zapss29-Oct-04 23:56

Zapss

29-Oct-04 23:56

Hello

How can i change the title bar color?
i have using MSDN sample code but
no use link below

http://msdn.microsoft.com/library/default.asp?url=/libraray/en-us/sysinfo/base/changing_the_color_of_window_elements.asp

Re: How can i change the Form title bar color

Heath Stewart30-Oct-04 3:04

Heath Stewart

30-Oct-04 3:04

You either change it for the whole system using the Display control panel, or you complete draw the window frame yourself, which requires knowledge about the Window APIs and P/Invoke. If you want to venture down that route, I highly suggest you read all of Interoperating with Unmanaged Code[^] (pay close attention to the marshaling topics) and search this site for examples of owner-drawn window frames.

BTW, the link doesn't work.

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Unload

Anonymous29-Oct-04 23:05

Anonymous

29-Oct-04 23:05

I have a usercontrol with a few controls on it. In the load of my usercontrol I read the settings from the registry. I also want to write these settings back to the registry when my usercontrol is unloaded. But there is no such thing as unload.

Can anyone tell me which event to use to write these settings to the registry?

Re: Unload

Stefan Troschuetz30-Oct-04 0:15

Stefan Troschuetz

30-Oct-04 0:15

Take a look at the Disposed event.

www.troschuetz.de

Re: Unload

Heath Stewart30-Oct-04 3:19

Heath Stewart

30-Oct-04 3:19

That wouldn't work. Disposed happens after the control is disposed, so his controls that contains the values and any fields or properties that might reflect those values are already gone.

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Re: Unload

Heath Stewart30-Oct-04 3:25

Heath Stewart

30-Oct-04 3:25

Handling the Disposed event is too late. You need to override Dispose(bool), persist your data, then call base.Dispose(bool) like so:

protected override void Dispose(bool disposing)
{
  PersistToRegistry();
  base.Dispose(disposing);
}

That way the child controls and other data is disposed after you get the data contained within. Once those controls are disposed you can't get their data (because it's been disposed).

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connection through proxy server

Kamran Zafar29-Oct-04 22:35

Kamran Zafar

29-Oct-04 22:35

Hi,

my chat client is easily connecting to the Server program using Sockets (in c-sharp). But

now i want to provide the functionality in my chat client program to be able to connect

through proxy. How can I do this.

Besides, I see in MSN, that there are 3 types of Proxy setting in it i.e.
- SOCKS VERSION 4
- SOCKS VERSION 5
- HTTP Proxy

would it make a major difference in the client side coding if i have to support all the

above types?

A prompt reply will be appreciated.

Regards,
Kamran

Re: connection through proxy server

Heath Stewart30-Oct-04 4:01

Heath Stewart

30-Oct-04 4:01

Your protocol has to be defined to work with proxies - it isn't automatic. The only advice anyone can really give you is to read the RFCs from http://www.ietf.com/rfc[^] for those proxy types to determine how you could include them along with your protocol definition.

HTTP, for example, allows for proxies. This is why the HTTP-related classes (like HttpWebRequest) support proxies (a la the WebProxy) in the .NET BCL. It's common enough to warrant inclusion in the .NET BCL. How other protocols work with proxies is up to the protocol authors. Many typically work the same (there's a lot of HTTP-like protocols, like SMTP, DICT, etc.) so I'd imagine the proxy support works the same, making it easy to use the same proxies.

What I'd recommend is using a good OO design to encapsulate your Socket client in a class and actually make use of the WebProxy for consistency (so people can reuse the same proxy; WebProxy also defaults to using the Internet Explorer settings for proxies, making it easy for your users to default to settings they might've already configured). You still need to work out how it'll work with your chat protocol, though.

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MdiWindowListItem in C# express beta

benjymous29-Oct-04 21:04

benjymous

29-Oct-04 21:04

From what I can tell, the MDIList property that you used to set on a menu to make it display an MDI window list has been changed to become a MdiWindowListItem property on the MenuStrip itself

I set this to my Window menu, and it works fine when I open the first child window - Screenshot 1[^] but when I have more than one child it goes out of control: Screenshot 2[^]

(basically every time a new child window is created, it seems to add new menu items from scratch, so the existing items get left behind)

Am I doing something drastically wrong here, or is this just incomplete .NET 2.0 stuff? (I've searched everywhere for documentation on this, but haven't been able to find anything!)

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