C# Discussion Boards - CodeProject

24-Jun-09 12:00

In JavaScript you can run document.getElementsByTagName ("img") to get all of the image tags. Can you do something similar in C#?

Also you can do this is JavaScript:

var image = document.createElement ("img");
image.getAttribute ("src");

Again can you do something similar in C#? And if so, how?

This is how I'm getting the webpage: http://www.tech-recipes.com/rx/1954/get_web_page_contents_in_code_with_csharp/[^]

Thanks.

harold aptroot24-Jun-09 12:59

Re: Getting XHTML tags by tag name [modified]

24-Jun-09 12:59

If it's really XHTML and not just plain old HTML, you could just treat it as xml: use XmlDocument and its SelectNodes(string xpath) function
At least, that's what I would do..

The xpath would be something like "//img/@src" I think (if you want all src attributes of all img's as your code seems to do)

Jordanwb25-Jun-09 7:12

25-Jun-09 7:12

Okay I'll give that a try.

I've found out that the XHTML isn't completely valid. Some of the tags aren't closed properly. Here's in excerpt:

<META HTTP-EQUIV="content-type" CONTENT="text/html; charset=UTF-8">
<meta name="robots" content="noarchive"/>
<meta name="description" content="/a/ is 4chan's imageboard dedicated to the discussion of Japanese anime and manga."/>
<meta name="keywords" content="imageboard,japan,anime,manga"/><link rel="alternate stylesheet" type="text/css" href="http://zip.4chan.org/yotsuba.9.css" title="Yotsuba"><link rel="stylesheet" type="text/css" href="http://zip.4chan.org/yotsublue.9.css" title="Yotsuba B"><link rel="alternate stylesheet" type="text/css" href="http://zip.4chan.org/futaba.9.css" title="Futaba"><link rel="alternate stylesheet" type="text/css" href="http://zip.4chan.org/burichan.9.css" title="Burichan"><link rel="alternate" title="RSS feed" href="/a/index.rss" type="application/rss+xml" /><title>/a/ - Animu &amp; Mango</title>

While some of the tags are somewhat formed properly, some aren't. The first one is easy:

result.Replace ("\"/>", "\" />");

I think I could use regex for the tags missing a closing "/" but I don't know how to do that.

[Edit]

Okay the result.Replace bit isn't working.

modified on Thursday, June 25, 2009 1:18 PM

harold aptroot25-Jun-09 7:26

25-Jun-09 7:26

I'm afraid you may have to use a custom parser, for HTML.. That will work, but it's a lot of work to make.

Jordanwb25-Jun-09 7:29

25-Jun-09 7:29

Well all of the HTML seems to be properly nested as per the XHTML specs, but some of the tags simply aren't closed properly. All I may need to do is C#'s version of PHP's preg_replace function.

harold aptroot25-Jun-09 7:30

25-Jun-09 7:30

If you can get that to work then it's probably less work, but it may not be as robust. Up to you though Smile | :)

Jordanwb25-Jun-09 7:35

menustirp items disappear from designer, but still in properties list

25-Jun-09 7:35

I found more malformed HTML on other boards. It seems that my program will be significantly more complicated than I though. Frown | :(

Putting a XHTML transitional doctype creates 431 errors just on one thread alone.

ThorTheBraveGod24-Jun-09 11:26

ThorTheBraveGod

24-Jun-09 11:26

I have a MDI project. The child forms have a menustrip, the menustrip used to have items like File, Edit etc. But today when I opened the project the items where gone from designer view. I can still find the items in the dropbox that contain all objects on the form, but when I select them they do not appear. It is not the allow merge property the most people think it is, this is in design mode not run time. The menu doesn't even appear at run time. I have tried google and other sources no sucesss?

Anyone know what causes this ???

tom

Re: menustirp items disappear from designer, but still in properties list

Cracked-Down24-Jun-09 20:24

Cracked-Down

24-Jun-09 20:24

Its look like the problem is in Visual studio IDE

you might want to try this (Work around)
remove the strip from form try adding it again on the from
this might solve your problem

Re: menustirp items disappear from designer, but still in properties list

ThorTheBraveGod25-Jun-09 3:19

ThorTheBraveGod

25-Jun-09 3:19

Yeah I have done that before, but that only solves the problem for a while, what do I do when it happens again? I need to know what causes this?

Re: menustirp items disappear from designer, but still in properties list

ThorTheBraveGod25-Jun-09 10:21

ThorTheBraveGod

25-Jun-09 10:21

This is what I have found out so far: it seems that what you are working with the forms resource folder, and you delete a resource file, I get a message saying that the designer might become unstable. as soon as I delete a resource and I get the warning message and I say Ok, then the menu items disappear and some other random items disappear. The solution to avoid this problem is instead of deleting, one should exclude instead.

Tom

Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host

milenalukic24-Jun-09 11:10

milenalukic

24-Jun-09 11:10

I am trying to send an SMTP email. It runs fine on my computer and on anothe one at home, both on vista, but when I sent it to a friend who is running windows xp pro it is giving him this error. anyboby knows why and how to solve please?

System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.DelegatedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
at System.Net.BufferedReadStream.Read(Byte[] buffer, Int32 offset, Int32 count)
at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)
at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)
at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port)
at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port)
at System.Net.Mail.SmtpClient.GetConnection()
at System.Net.Mail.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at FireTalkNew.TellFriend.InviteFriend()
at FireTalkNew.TellFriend.btnInvite_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
FireTalkNew
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///C:/Documents%20and%20Settings/Ninu/Local%20Settings/Apps/2.0/17HTMRTE.XCA/NAECG3MY.J21/fire..tion_0000000000000000_0001.0000_323f949fc90232cc/FireTalkNew.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Core
Assembly Version: 3.5.0.0
Win32 Version: 3.5.30729.1 built by: SP
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Data.Linq
Assembly Version: 3.5.0.0
Win32 Version: 3.5.30729.1
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Data.Linq/3.5.0.0__b77a5c561934e089/System.Data.Linq.dll
----------------------------------------
System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Data
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
System.Transactions
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Transactions/2.0.0.0__b77a5c561934e089/System.Transactions.dll
----------------------------------------
System.EnterpriseServices
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.EnterpriseServices/2.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll
----------------------------------------
Anonymously Hosted DynamicMethods Assembly
Assembly Version: 0.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/mscorlib/2.0.0.0__b77a5c561934e089/mscorlib.dll
----------------------------------------
System.Xml.Linq
Assembly Version: 3.5.0.0
Win32 Version: 3.5.30729.1 built by: SP
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml.Linq/3.5.0.0__b77a5c561934e089/System.Xml.Linq.dll
----------------------------------------

FD

Re: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host

Colin Angus Mackay24-Jun-09 13:20

Colin Angus Mackay

24-Jun-09 13:20

milenalukic wrote:
anyboby knows why and how to solve please?

What's the code used to send the email?

Re: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host

milenalukic24-Jun-09 22:08

milenalukic

24-Jun-09 22:08

private void SendMail()
{
name = txtName.Text;
string body = txtMessage.Text;
MailMessage email = new MailMessage(FromEmail, ToEmail, subject, body);

SmtpClient SmtpMail = new SmtpClient(host, 25);
SmtpMail.Credentials = new NetworkCredential(email, password);
SmtpMail.EnableSsl = false;

SmtpMail.Send(email);

MessageBox.Show("Your message has been sent.", "Message Sent", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

FD

Encrypted Connection

ziwez024-Jun-09 9:23

ziwez0

24-Jun-09 9:23

Ive been developing a app that uses a sql compact database (3.5).
when the app installs the database connection path is designed to be dynamic (ie i dont know if there local drive will be c?)

so ive written the follwing (feel free to advise if there is a better way to do this)

namespace SomeNameSpace.DataAccess.Help.SQLCommands
{
internal class ConnectionCommand
{

internal class GetConnectionCommand()
{

internal const string LiveDatabase()
{
private readonly static string xDataSourceAccess = "Data Source=" + System.Windows.Forms.Application.StartupPath + "\\Data\\database.sdf;Password=password1;Persist Security Info=True";
return xDataSourceAccess;
}

}
}
}

but im concerned about have the password in free text, any example of how i can improve this?

thanks

Re: Encrypted Connection

harold aptroot24-Jun-09 9:47

24-Jun-09 9:47

You mean you're concerned that it's plaintext?
Well don't worry, it's impossible to actually encrypt it. You can obfuscate it (possibly with encryption, but the key you use for that will have to be stored, unless you encrypt the key in which case you have a new key, and in the end you will always have an unencrypted key) but keep in mind that obfuscating it will tell any hacker who just accidentally comes across it that it is something that you wanted to hide and thus must be something important.
So, my advice would be to use the "hide in plain sight" trick - just put it in the AppSettings somewhere, not encrypted, but in separate parts (not the whole string, but only parts, like "password1" or maybe "pass" and "word1" somewhere else to make it look less like a password)
Doing any encryption on it will only make it stand out, and it will never make it impossible to get the password unless even your app itself can not get the password either (which is pretty lame)

Re: Encrypted Connection

EliottA25-Jun-09 2:53

EliottA

25-Jun-09 2:53

harold aptroot wrote:
So, my advice would be to use the "hide in plain sight" trick

..That's just bad advice.

Check out the CodeProject forum Guidelines[^]
The original soapbox 1.0 is back![^]

Re: Encrypted Connection

harold aptroot25-Jun-09 4:07