Re: problem in Class - C# Discussion Boards

How can I remotely explore my LAN? Remoting?

5-Jun-10 3:11

I didn't want to discourage the chap. Laugh | :laugh:

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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Member 18349914-Jun-10 6:57

Member 1834991

4-Jun-10 6:57

I am trying to add a new feature to my app written in C#.

I have just begun exploring "remoting" as a solution for a particular problem. It looks like quite a learning curve, so I thought I would ask some experts before spending a lot of time and discovering what I want to do is not possible.

Can you "remote" a windows control like the FolderBrowsingDialog? What I want to do is see the dialog on my PC, but actually be browsing folders on the remote PC.

Not Active4-Jun-10 7:06

Not Active

4-Jun-10 7:06

Remoting is not going to help you with this.

You can use the dialog, if you have access to the system, and browser the UNC path of the machine, \\MySystem. However, if no folders are shared or you don't have access to the roots (\\MySystem\C$), nothing is going to help.

I know the language. I've read a book. - _Madmatt

#realJSOP4-Jun-10 7:31

#realJSOP

4-Jun-10 7:31

If it's the standard File Open dialog, it will allow you to browse machines it can find on the network. If you have the machine name/IP of the machine in question, you can probably send data to that ip/port and any app listening on that port would be able to respond/receive the data you're sending. You may also bup into permissions issues, especially if we're talking about Vista or Weven.

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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Member 18349914-Jun-10 8:52

Member 1834991

4-Jun-10 8:52

Perhaps more information would clarify what I am trying to do:

I have a C# server application that runs on a dedicated headless PC at a remote location. Actually 5 of them at different locations. The server monitors specific files in specific shares on other systems on the local LAN. I monitor these servers from a central point. This works great.

The problem:

Sometimes things change on the remote LAN. New systems are added or existing systems are removed. I need to be able to modify the monitoring configuration to add/change/delete the monitored folders as necessary.

From the desktop it would be easy, just use a file FolderBrowsingDialog, find the new system and add "\\NewHost\Share\Folder" to the database. For various reasons I can't use RemoteDesktop so doing this from 200 miles away is problematic...

My first thought was to add a few commands to our communications protocol so I could send a command to the monitoring system to get the network host, then get the shares, then get the folders, etc. In my rough outline this got complicated quickly starting with how do you even get a list of the available hosts on the local LAN... I found some articles, but clearly this is going to be a lot of work for a relatively simple task.

My second thought was remoting. I have never done remoting so again I looked for some examples. Another learning curve but seems less problematic than dealing with manually browsing the network.

The object I would like to remote is the standard FolderBrowsingDialog, like the File Open dialog, but just to pick a folder. I want to have the dialog appear on my screen from my client application, but be browsing the servers LAN 200 miles away.

#realJSOP5-Jun-10 1:56

#realJSOP

5-Jun-10 1:56

This is a logistical nightmare. Smile | :)

Is your application a windows service? I suspect that it is (since the machines are headless), but if not, it should be. The service itself can regularly scan for new shares without explicitly being told to do so. When it detects a new share, it can simply start watching for files in the specified folder (if/when it exists). All that has to happen is that the share needs to be established by the remote admin (or you remotely).

If you don't want it to automatically scan for new shares, you can send it data with the share info, and it can save that info in a data file to be retrieved in the event of a hardware restart.

You could use remoting for that, but I think it would be simpler to just send the info via your existing mechanism.

problem in Class

SajjadZare4-Jun-10 6:15

SajjadZare

4-Jun-10 6:15

I have a class and two form in my project

i want to validate a filed from form1 and use this field's value in form2

but when i want to use it i cant't access to this value becuase every
time that i new ، object from class filed's value was destroyed

how can i do that ?

Abhinav S4-Jun-10 6:18

Abhinav S

4-Jun-10 6:18

I think you need to post some code here.
I'm sure once you do that someone will be able to help you.

In the meanwhile, also check if the singleton pattern can help you in anyway.

My signature "sucks" today

SajjadZare4-Jun-10 6:51

SajjadZare

4-Jun-10 6:51

class class1
{
public int a;
}

form1 :

class1 s=new class1();
s.a=10

form2:

class1 c=new class1();
messageBox.show(c.a.tostring()); // I want to see 10 here

Luc Pattyn4-Jun-10 8:37

4-Jun-10 8:37

SajjadZare wrote:
I want to see 10 here

only people unfamiliar to object orientation would expect or accept that to happen.

you have two statements containing new class1() which means two objects get created, i.e. two different instantiations of the class1 class. Now if one object is changed, that should not reflect on its siblings. If your house has ten windows and you happen to break one of them, you would not like all of them to break into pieces, would you?

There are a couple of ways to get what you want. They all have one thing in common: they create only one instance of the thing that needs to be accessed at several locations, instead they pass a reference around. And there is a plethora of articles on the subject, maybe this one[^] can help you.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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OriginalGriff4-Jun-10 8:50

OriginalGriff

4-Jun-10 8:50

Because what you are doing is creating two separate instances, you can only do this if there is a single variable "a" that is common to all instances of "class1". You do this with the static keyword.:

class class1
   {
   public static int a;
   }

You can then use it in any instance.
form1:

class1 s=new class1();
class1.a=10

form2:

class1 c = new class1();
MessageBox.Show(class1.a.ToString());

But you can't use "s.a" or "c.a" because it would look confusing - you might think that "a" was specific to the particular instance of class1 rather than shared between them.

It's a bit like cars: They can all have a colour, but they don't share it: YourCar has a different colour (blue) to MyCar (red). They do share common information: NumberOfWheels (4)

So you can't say "What colour is a car?" but you can say "How many wheels has a car?"
You can say "What colour is my car?" or "What colour is your car?" because this specifies exactly which car you are talking about.

If you feel you must access "a" via an instance, you can declare a property which does that for you (but it isn't really recommended):

class class1
   {
   private static int a;
   public int A
      {
      get { return a; }
      set { a = value;}
      }
   }

You can now access "A" via "s.A" and "c.A" to get the same value which is shared between all instances of class1.

Did you know:
That by counting the rings on a tree trunk, you can tell how many other trees it has slept with.

Luc Pattyn4-Jun-10 9:30

4-Jun-10 9:30

I'm not so sure this is a good suggestion. Maybe what he wants to share deserves to be static and unique, but I didn't get a clue in that direction; simply adding "static" to get something to work is not OK in my books. As I guess you read similar books, maybe I missed something?

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

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Re: problem in Class [modified]

OriginalGriff4-Jun-10 9:41

OriginalGriff

4-Jun-10 9:41

Oh I agree - static is best reserved for when it is really needed - but since I haven't a clue what he wants to do with it, I didn't want to just leap in with "you can't do it", so I tried to explain a bit as to when you use static. I don't think I have used static for anything other than methods in C# yet - just haven't found the need...

I started writing my response before you posted yours, and saw yours there after I pressed "Post Message". I'm just a slow typist sometimes - especially when the wife is trying to use the internet so I have to stop and sort her out every few minutes. Smile | :)

Did you know:
That by counting the rings on a tree trunk, you can tell how many other trees it has slept with.

Luc Pattyn4-Jun-10 9:49

4-Jun-10 9:49

Oh great, blame the wife for giving an overly static/Shared and slow response. Laugh | :laugh:

Most of my classes do have a couple of static data members, often for statistical purposes (counting or holding a list of all instances), and for logging parameters. But these are just tools, they don't reflect application-domain properties.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

modified on Friday, June 4, 2010 5:55 PM

OriginalGriff4-Jun-10 11:53

OriginalGriff

4-Jun-10 11:53

She is a natural VB user - she finds out about a tool, then she uses it for everything. Laugh | :laugh:

Everything can be a hammer, if you hit it hard enough...

Did you know:
That by counting the rings on a tree trunk, you can tell how many other trees it has slept with.

Luc Pattyn4-Jun-10 11:57

4-Jun-10 11:57

Now it all makes sense; I have fixed my earlier message accordingly.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read formatted code with indentation, so please use PRE tags for code snippets.

I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).

Enterprise Library Logging Application Block: using special sources

Not Active4-Jun-10 6:57

Not Active

4-Jun-10 6:57

What you need is a static class that can be shared between forms. You can use Session or Application state for this if you are using ASP.NET, however, if the object is large it may not be the best way to handle it.

You can also pass the value you are interested in from form1 to form2 via properties, events, constructors.

I know the language. I've read a book. - _Madmatt

Shtel4-Jun-10 3:16

Shtel

4-Jun-10 3:16

Hello all,

I have configured my logging application block as follows, using Enterprise Libaray 4.1 (in app.config):

<loggingConfiguration name="Logging Application Block" tracingEnabled="true" defaultCategory="General" logWarningsWhenNoCategoriesMatch="true">
 <logFilters>
 <add
  name="LogEnabled Filter"
  type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.LogEnabledFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
  enabled="true"
  />
 
 <listeners>

 <add
  name="Rolling Flat File Trace Listener Debug"
  fileName="Logs/Debug.log"
  header="------HEADER-------"
  footer=""
  formatter="Text Formatter"
  rollFileExistsBehavior="Overwrite"
  rollInterval="Day"
  rollSizeKB="10000"
  timeStampPattern="yyyy-MM-dd"
  listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  traceOutputOptions="None"
  filter="Verbose"
  type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  />

 <add
  name="Rolling Flat File Trace Listener Unprocessed"
  fileName="Logs/Unprocessed.log"
  header="-------------"
  footer=""
  formatter="Text Formatter"
  rollFileExistsBehavior="Overwrite"
  rollInterval="Day"
  rollSizeKB="10000"
  timeStampPattern="yyyy-MM-dd"
  listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  traceOutputOptions="None"
  filter="Verbose"
  type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  />

 <add
  fileName="Logs/RawLogHistory/RawLogHistory.log"
  name="Rolling Flat File Trace Listener Full History"
  header=""
  footer=""
  formatter="Text Formatter"
  rollFileExistsBehavior="Overwrite"
  rollInterval="Day"
  rollSizeKB="10000"
  timeStampPattern="yyyy-MM-dd"
  listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  traceOutputOptions="None"
  filter="Verbose"
  type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  />

</listeners>
 <formatters>
 <add
  name="Text Formatter"
  template=" {severity} [{timestamp}] {message}"
  type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
  />
 </formatters>

 <categorySources>

 <add switchValue="All" name="General">
  <listeners>
  <add name="Rolling Flat File Trace Listener Debug"/>
  </listeners>
 </add>

 <add switchValue="All" name="Debug">
  <listeners>
  <add name="Rolling Flat File Trace Listener Debug"/>
  </listeners>
 </add>

 <add switchValue="All" name="Exception">
  <listeners>
  <add name="Rolling Flat File Trace Listener Release"/>
  <add name="Formatted EventLog TraceListener Formicary"/>
  </listeners>
 </add>
  </listeners>
 </add>

 </categorySources>

 <specialSources>

 <allEvents switchValue="All" name="All Events"/>

 <notProcessed switchValue="All" name="Unprocessed Category"/>
  <listeners>
  <add name="Rolling Flat File Trace Listener Unprocessed"/>
  </listeners>
 </notProcessed>

 <errors switchValue="Information" name="Logging Errors &amp; Warnings">
  <listeners>
  <add name="Rolling Flat File Trace Listener Debug"/>
  </listeners>
 </errors>

 </specialSources>

</loggingConfiguration>

Everything works fine.

The only issue i have, is with the "Unprocessed Category" special source.

Reading the documentation from msdn for EntLib L.A.B., i undestood that when you try and log to a Category that is not specified, that LogEntry is directed to the Unprocessed Category source.

In the above example though, if i log a Verbose message, and define the category in the LogEntry to be let's say "Undefined" (which is not specified in the configuration), i loose that LogEntry completely. Ideally, when the application attempts to log, it should do the following steps:
-Get the LogEntry and pass it through the logfilters.
-If it passes through the logfilters, find the category that the logentry specifies, and pass it to the listeners in that category
(in our current case, category is "Undefined")
-If you can't find the category specified in the LogEntry,go to the "Unprocessed Category" special source and log it to the listeners specified in there.

BUT:
!!Last step is never executed. I do not get the log in my flat file!!
NOTES:
-I have double checked, and the filters for both
the listeners and the categories are not blocking the LogEntry because of the level of message (verbose, information, etc...)
-The other special sources ("All Events" and "Logging Errors & Warnings") work fine.

Any suggestions on why this is the case?

Any hints would be appreciated.

Regards,

Shtel

Finding base class of an object

dashingsidds4-Jun-10 3:07

dashingsidds

4-Jun-10 3:07

Hi Experts,

This should be a very trivial question for you guys.

I have an object with me. This object is an object of a class who is inherting from an abstract base class. I want to know what is that base class.

Let me give you an example

Say I have 2 abstract base classes namely MyBaseClass1 and MyBaseClass2 which is inheriting from a Form class so my code would be something like this.

abstract public class MyBaseClass1 : Form
{
    abstract public void MyMethod1();
}

abstract public class MyBaseClass2 : Form
{
    abstract public void MyMethod2();
}

I have many forms which are inheriting from these base classes. For example

public partial class Form1 : MyBaseClass1
{
    public Form1()
    {
        InitializeComponent();
    }

    public override void MyMethod1()
    {
        MessageBox.Show("mymethod1");
    }
}

These forms will be opened in an MDI form. I want to know which is my active form. This i can get from the property of the MDI form ActiveMdiChild. But this property will return me a Form object. I want to know what is the base class of this form object i.e. whether it is MyBaseClass1 or MyBaseClass2. I also want to create an object of this base class if possible.

Please do let me know if I hv not explained my query properly.
Please help!
Thanks in advance!

Regards,

Samar

JoeSharp4-Jun-10 3:27

JoeSharp

4-Jun-10 3:27

if (ActiveMdiChild is MyBaseClass1)
{
// your code hier
}

Anthony Mushrow4-Jun-10 3:45

Anthony Mushrow

4-Jun-10 3:45

You have a few options, you can as previously stated use the is keyword and see if it's the type you are looking for.
An alternative is to actually look at the BaseType:

Type t = ActiveMdiChild.GetType();
//You can then look at t.BaseType, I'd like to point out that if you inherit from
//an interface you will have to look at FindInterfaces

Type baseClass = t.BaseType;

//You can then create an instance of this type
object something = Activator.CreateInstance(baseClass);

However, unless there is a common base class that you can cast to so that you can use it then you are back to checking the actual type and casting to that.
So depending on what you have and what you need you can either have a series of if statements checking for the types or the above method where you will be able to create and use your base class without necessarily knowing exactly what it is.

My current favourite quote is: Punch them in the face, see what happens!

-SK Genius

dashingsidds4-Jun-10 4:25

dashingsidds

4-Jun-10 4:25

Hmm.. This looks good but i wont get the methods of the base class object in the intellisense here. Is there a way of getting that too? Maybe i am asking for too much here. Smile | :)

Regards,

Samar