Suggestions for general networking solution on WAN and LAN - C# Discussion Boards

Re: Passing a Form's control to a routine in another class as a variable

8-Oct-09 4:58

When you get this error if you hover your mouse over the offending item, you should see a rectangle appear under the rightmost letter of the word. Moving the pointer over this rectangle changes it to a drop-down, offering solutions. Simply select the 'using System.Drawing' one and bob's-your-uncle. Smile | :)

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

PIEBALDconsult8-Oct-09 5:32

PIEBALDconsult

8-Oct-09 5:32

Fully qualify the name.

Suggestions for general networking solution on WAN and LAN

lvq6848-Oct-09 4:24

lvq684

8-Oct-09 4:24

Hi.

I am about to program a piece of software which contains a single server, and about 20-40 clients.
All parts can be spread out on a lan, or on a wan.
The server shall be able to broadcast/multicast to the clients in some way, and the clients should be able to fetch information from the server.
There are about 30 kinds of information which has to be fetched/broadcasted.

Question is, how to solve this general problem in the most elegant way?
I would be happy if i could avoid switches in the client/server end to check what kind of information i received, or make my own kind of application layer protocol to check it.
I had a look at remoting, like RMI in java, but that seems to be a very bad idea over WAN because of firewalls and such.

Do you have any insight in possible solutions for this?

Thanks alot Smile | :)

Re: Suggestions for general networking solution on WAN and LAN

Mirko19808-Oct-09 4:40

Mirko1980

8-Oct-09 4:40

If you have to communicate through WAN, your best option is using Windows Communication Foundation, using one of the HTTP bindings.

[C#.NET 2008] Screen-scraping a HTML Page

Dimitri Backaert8-Oct-09 3:47

8-Oct-09 3:47

Hi,

I'm trying to process the HTML source code from a certain web page.
This web page has security enabled, using a Username & a password.

I'm using the following method to try to access the page:

public static string GetHtmlPageSource(string url, string username, string password)
{

	WebClient wc = new WebClient();

	wc.Credentials = new NetworkCredential(username, password);
	
	try
	{
		using (Stream stream = wc.OpenRead(new Uri(url)))
		{
			using (StreamReader reader = new StreamReader(stream))
			{
				return reader.ReadToEnd();
			}
		}
	}
	catch (WebException e)
	{
		//Error handeling 
		return e.ToString();
	} 
}

This doesn't work however, I seem to be stuck at the logon page. I'm not able to pass the user security.
Anyone has an idea?

Henry Minute8-Oct-09 4:20

8-Oct-09 4:20

Do you not think that the site owners put the security there for a reason?

Dimitri Backaert8-Oct-09 4:58

8-Oct-09 4:58

Yes I do, it's to prevent unauthorised access to the page... Laugh | :laugh:

However, this is a Web page that exists on the intranet of our company network.
It displays certain measures which we want to display on a Dashboard application.

The idea is to have an overview of these values at the blink of an eye (the dashboard will be projected on a whiteboard).

Normally, we would use a read account on the database for this, but (since the database is being managed by the Netherlands and I am a Belgian employee) the Netherlands are refusing to give us a read account.
So this is the only way how we can succeed in building the dashboard.

Richard MacCutchan8-Oct-09 5:10

Richard MacCutchan

8-Oct-09 5:10

Dimitri Backaert wrote:
Normally, we would use a read account on the database for this, but (since the database is being managed by the Netherlands and I am a Belgian employee) the Netherlands are refusing to give us a read account.

Does the chairman of the company think this is a good thing?

Henry Minute8-Oct-09 5:24

8-Oct-09 5:24

Doncha just luuuv office politics? Laugh | :laugh:

Richard MacCutchan8-Oct-09 6:05

Richard MacCutchan

8-Oct-09 6:05

Henry Minute wrote:
Doncha just luuuv office politics?

I just wonder why the Dutch don't trust the Belgians? Laugh | :laugh:

Dimitri Backaert8-Oct-09 11:19

8-Oct-09 11:19

This might all seem very funny, I know, but it doesn't solve my problem.... D'Oh! | :doh:

Concerning the chairman, A request has been sent by my manager.
But this might take a while to achieve (office / political war between Belgium / Netherlands).

The main reason why the Netherlands are unwilling to release information, is that they were formerly the only group that maintained all the ICT infrastructure for the whole Benelux company group.
However, since the beginning of 2009, Belgium and Luxemburg splitted from the Netherlands, and created their own ICT division.

I think it's some sort of Job Protection...
Politics, money, it's all involved.
And it's - excuse my language - a real pain in the ass...

WBurgMo8-Oct-09 8:44

WBurgMo

8-Oct-09 8:44

Dimitri Backaert wrote:
This doesn't work however, I seem to be stuck at the logon page. I'm not able to pass the user security.
Anyone has an idea?

It would seem that WebClient is not recognizing this page
as an authentication request. You will most likely have to
manually format the correct response and send it to the server.

I would use "WireShark" to trace a manual session with the server. This should let you see what the server expects for
an authentication response.

James Johnson

Dimitri Backaert8-Oct-09 11:20

Advanced combobox binding from code

8-Oct-09 11:20

James,

Thank you for your answer.

This could do the trick.

I'll try it out.

I already was thinking about changing the HttpWebRequest in another method, because in my opinion a WebRequest is the equivalent of a GET.

What I need is a POST, so I'm thinking of using an HttpWebResponse...

erfgerfgerger8-Oct-09 3:19

erfgerfgerger

8-Oct-09 3:19

Suppose I have a business object '`obj1`' that has property '`P`'.

Let's also assume that I have a list of business objects: '`List<BussObj> list`' and each BussObj object contains 2 properties: '`A`' and '`B`'.

This list is bound to combobox: `combobox.ItemsSource = list;`.

I would like to specify binding (in C# code) that would bind combobox.SelectedItem.B to my obj.P. How to do it?

I tried something like that but it does not work:

Binding bind= new Binding("B");
bind.Source = obj.P;
comboSubject.SetBinding(ComboBox.SelectedItemProperty, bind);

Thank you in advance for any help

Trouble calling cpp dll function whose input is char** [modified]

platso_5888-Oct-09 2:22

platso_588

8-Oct-09 2:22

Hello,
I am Developing a C# WINDOWS application. In my Application i need to call a cpp dll which returns the list of Drives

connected to the PC.
The Function is "int GetDeviceDiskName(char**);". I can get all the drive names in my vc++ application after i call this

function.

char *device[10];

for(int i = 0; i < 10; i++)
{
device[i] = new char[10];
memset(device[i],0,10);
}
int nRes = GetDeviceDiskName(device);

device returns all the USB's attached to the PC.

But I have Trobule calling this function in C#.Net.

In my c# code i have declared the function in this manner,
[DllImport("../../Hanlin.dll", SetLastError = true, CharSet = CharSet.Ansi,CallingConvention = CallingConvention.Cdecl)]
public static extern Int32 GetDeviceDiskName(String[] deviceName);

In c# i tried to call this function in this way,

char[] deviceName = new char[10];
int nStatus = GetHanlinDeviceDiskName(ref deviceName);

But I get Error as "Additional information: Attempted to read or write protected memory. This is often an indication that

other memory is corrupt."

Can some one help me how to call this function.

In the Dll file the "device" array will be updated in this way,
if(bDiskFound)
{
device[cnt][0]=cDiskID;
cnt++;
}

modified on Thursday, October 8, 2009 9:09 AM

Re: Trouble calling cpp dll function whose input is char**

Luc Pattyn8-Oct-09 2:52

Luc Pattyn

8-Oct-09 2:52

Marshaling char** parameters isn't easy, and probably not worthwhile. I would recommend any of three alternatives:
1. implement the functionality directly in C#
2. call an existing native function of a lower level, e.g. dealing with just one device at a time (pass a StringBuilder to be filled)
3. pass a StringBuilder instance with sufficient capacity, and store the device names in there, separated by some character, say a semi-colon; upon return call ToString() and Split(';') on it.

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Local announcement (Antwerp region): Lange Wapper? Neen!

change picture of image controll in gridvie in windows application???? [not solved yet...]

mr.mohsen8-Oct-09 1:16

mr.mohsen

8-Oct-09 1:16

hi friends
i have a datagridview and i add a column to this datagrid that has a picture(start symbol) i want to write a code that when a user click on the picture in datagridview the picture of that control has been changed
(stop symbol). please tell me a solution and say me what code are usefull for this action

nobody help you...
you have to help you yourself
and this is success way.

modified on Thursday, October 8, 2009 1:32 PM

Re: change picture of image controll in gridvie????

Atif Ali Bhatti8-Oct-09 1:40

Atif Ali Bhatti

8-Oct-09 1:40

hi,
its simple... add following html in the gridview column.

<a href="javascript:void(0);" onclick="ChangePic(this);"><img src="xyz.jpg"/></a>

now add a add following javascript to your page:

function ChangePic(sender)
{
sender.childNodes[0].src="abc.jpg";
}

there are many more ways to do this.

Hope It solves ur problem...

Regards
Atif Ali Bhatti.

Re: change picture of image controll in gridvie????

mr.mohsen8-Oct-09 2:34

mr.mohsen

8-Oct-09 2:34

i spoke about a windows application not web application my friend

nobody help you...
you have to help you yourself
and this is success way.

Re: change picture of image controll in gridvie in windows application????

Henry Minute8-Oct-09 4:18