Re: Problem during deserialization - C# Discussion Boards

Rob Philpott9-Apr-09 2:59

9-Apr-09 2:59

Hey nice, stopwatch is new to me. We have some performance timers in the system I work on, but they use raw API calls via interop to do their stuff. Just tried your first example - the elapse is usually 15ms but sometimes 16ms, so on XP I guess the resolution is 15.something ms.

Regards,
Rob Philpott.

Re: Get passed milliseconds from Timer

Luc 6480119-Apr-09 16:24

Luc 648011

9-Apr-09 16:24

It all depends on the available hardware; you may want to look at the article "Timer surprises, and how to avoid them"[^] which predates .NET 2.0 and hence does not mention StopWatch (which is based on PerformanceCounters anyway).

Smile | :)

Re: Get passed milliseconds from Timer [modified]

_groo_9-Apr-09 2:17

_groo_

9-Apr-09 2:17

You can create a new background thread with a manual reset event, waiting for a specified amount of seconds or an external Set.

// in your background thread
int msToWait = 5000;

do {

  // wait for Start event
  manualStartEvent.WaitOne(); 

  Stopwatch sw = new Stopwatch();
  sw.Start();
  // wait for Pause event, or until time elapses
  bool externalSet = manualPauseEvent.WaitOne(msToWait);
  sw.Stop();

  // check if Paused or elapsed
  int actualMsElapsed = sw.Elapsed.TotalMilliseconds;
  if (externalSet) // this indicates external set, so time did not elapse
  {  
    msToWait -= actualMsElapsed;
    if (msToWait < 0)
       msToWait = 0;
  }
  else // this indicates we're done
  {
    msToWait = 0;
  }

} while (msToWait > 0);

[EDIT] Code is posted only as an idea, you should take care of starting the thread, handling Stop situations and proper disposing all events.

modified on Thursday, April 9, 2009 8:39 AM

Re: Get passed milliseconds from Timer

Xmen Real 9-Apr-09 2:39

Xmen Real

9-Apr-09 2:39

hmmm nice way...thanks Wink | ;)

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R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>

-----------------------------------------------
128 bit encrypted signature, crack if you can

Problem during deserialization

lnmca9-Apr-09 0:24

lnmca

9-Apr-09 0:24

Hi All,

I am unable to deserialize the byte array to the object of structure on another machine,when i send it through TCP/IP by socket then there is no problem in serialization.,but problem occurs at the other side during deserialization.

It shows the error something like "unable to find assembly....."

I am using the following code....

private byte[] ObjectToByteArray(Object obj)
{
if (obj == null)
return null;
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, obj);
return ms.ToArray();
}
// Convert a byte array to an Object
private Object ByteArrayToObject(byte[] arrBytes)
{
MemoryStream memStream = new MemoryStream(arrBytes);
BinaryFormatter binForm = new BinaryFormatter();
memStream.Position = 0;
//memStream.Write(arrBytes, 0, arrBytes.Length);
// memStream.Seek(0, SeekOrigin.Begin);
Object obj = (Object)binForm.Deserialize(memStream);
return obj;
}

Please help,it is urgent....

Regards
Lalit Narayan

Re: Problem during deserialization

Rob Philpott9-Apr-09 0:51

Rob Philpott

9-Apr-09 0:51

That's telling you that it needs to know about the type (defined in an assembly you don't have loaded) in order to deserialise it. Make sure its in your project's references on the deserialisation side.

Regards,
Rob Philpott.

Re: Problem during deserialization

lnmca9-Apr-09 1:13

lnmca

9-Apr-09 1:13

Hi Rob,

thanks for reply,

but i have not attached the assembly at my side because i have to only read the data that is coming through TCP channel from the controller.

Please reply...

Regards,
Lalit Narayan

Re: Problem during deserialization

Rob Philpott9-Apr-09 1:21

Rob Philpott

9-Apr-09 1:21

What you have there is a method to convert an object to a byte array, and a method to convert a byte array to an object.

What you're transmitting is the member data of the object. All the methods and code for it isn't sent - that's defined in an assembly. You need to make sure that for any type which is sent this way, the assembly which contains it is on both client and server.

Find out which assembly the type you are serialising is in. Then make sure that assembly is referenced in the project dependencies of the deserialising project.

Regards,
Rob Philpott.

Re: Problem during deserialization

lnmca9-Apr-09 1:36

lnmca

9-Apr-09 1:36

Hi Rob,

Thanks for ur reply..

Actually the problem is that we are communicating the DDC through windows service,on DDC side there is no .Net assembly but the embeded type of work over there(like C++ type).
Now if when we receive the byte array from DDC then i have to convert it into object of my own created structure same as DDC side.

But for testing purpose i am communicating between two computers that have .net application and windows service.But basically i have to set up communication between windows service and the DDC.
So i do not want to attach the assembly..because there will no assembly on other side in real time.

Please reply...

Regards,
Lalit Narayan

Re: Problem during deserialization

Rob Philpott9-Apr-09 1:57

Rob Philpott

9-Apr-09 1:57

lnmca wrote:
Now if when we receive the byte array from DDC then i have to convert it into object of my own created structure same as DDC side.

That's not good enough. When you call serialize, it packages up the fully qualified type name - that includes namespace, type name and assembly. When deserialising on the other side it will use all these things to create the type prior to populating it. Just because you have a type with the same name .NET will not use that.

I don't entirely understand what's you trying to do, but unless both sides are .NET you want to steer clear of Serialisation and just send the relevant fields one by one.

Regards,
Rob Philpott.

Re: Problem during deserialization

Giorgi Dalakishvili9-Apr-09 2:11

Giorgi Dalakishvili

9-Apr-09 2:11

If on the other end you have a different type but with same fields then this how to deserialize: Advanced Binary Serialization: Deserializing an Object Into a Different Type Than the One It was Serialized Into[^]

Giorgi Dalakishvili

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UDP Hole Punching/STUN tutorials/SDK?

softwarejaeger9-Apr-09 0:21

softwarejaeger

9-Apr-09 0:21

Hello,

has somebody a tutorial for UDP Hole Punching or STUN? I have a few problems with the UDP Punching and a few points which i don't understand, maybe somebody could help me:

Here an article to UDP Hole Punching: http://www.h-online.com/security/How-Skype-Co-get-round-firewalls--/features/82481[^]">

so, UDP Hole Punching works like this, you have 2 clients and one server which knows the IP-Adresses of the clients and their ports over which they would send their UDP Packages (so here's the first problem, from where does the server know, which ports the client use?)

first step: Client1 gets the IP-Adress and the Port (see above, here's the problem) of Client 2.
second step: CLient1 (IP: 1.1.1.1:1000) sends a package to Client 2 (IP: 2.2.2.2:???? Which port is it?) over UDP, which will be deleted on the NAT-Router of Client 2 (no incoming packages)
third step: Client 1 sends the server the information to initiiate a connection to Client 2 over the port 1000 (Client 1) and the Port ???? (Client 2).
fourth step: CLient 2 gets the information to create a udp-connection to CLient 1 (IP: 1.1.1.1:1000) over his Port ????.

Well, you see the principle is easy, but the Ports of CLient 2 are my big problem, how do i find that out? Has somebody experience in UDP Hole Punching or STUN? Well, what's STUN? I get from a STUN server only my Port, from which i sendet my package to the Server, but another client couldn't do anything with that port and thats the problem how to find out the port of my partner.

Many Thansk

Re: UDP Hole Punching/STUN tutorials/SDK?

bewithram4-Jul-09 9:59

bewithram

4-Jul-09 9:59

Hi,

I am also trying to figure out the solution for the same problem.

Does anyone have the answer?

Re: UDP Hole Punching/STUN tutorials/SDK?

digichetan4-Sep-09 11:40

digichetan

4-Sep-09 11:40

I guess, this is how it should be done

1. You get back your mapped port and mapped address from the STUN
2. CLient2 also gets back its mapped port and mapped address from the STUN

3. The STUN server should store these info. When either clients want to communicate with the other, it sends a request to the STUN server. The Stun server then sends a message to both the clients with the mapped Addr and port of their counterpart.

4. After this, hole punching can be done by the method shown in the article above.

Re: UDP Hole Punching/STUN tutorials/SDK?

Cosby5-Dec-09 12:09

Cosby

5-Dec-09 12:09

Hi guys, i'm interesting at this. have you found some examples or howto?? How do you solve this problems??

Re: UDP Hole Punching/STUN tutorials/SDK?

Cosby7-Dec-09 2:26

Cosby

7-Dec-09 2:26

Hi guys, i'm interesting at this. have you found some examples or howto?? How do you solve this problems??

PLEASE HELP ME

Re: UDP Hole Punching/STUN tutorials/SDK?

srdusad17-Apr-10 0:14

srdusad

17-Apr-10 0:14

hi guys

if anybody found any solution regarding NAT traversal , please email me at : sanjudusad@gmail.com

Thanks in advance Sigh | :sigh:

how can i minimize my program i the sytem try ?

ariyanna9-Apr-09 0:09

ariyanna

9-Apr-09 0:09

hi everyone,
i want to know how can i minimize my program in the system try , in fact i want to know how can i create my program that when a user clicks on the minimize button program minimize in the system try (beside the system digital clock)?
I'm coding with C#.Net....tanx a lot Rose | [Rose]

Re: how can i minimize my program i the sytem try ?

DaveyM699-Apr-09 0:15

DaveyM69

9-Apr-09 0:15

Add a NotifyIcon to your form. Subscribe to the form's Resize event, check it's state and if minimized, set Visible to false and the NotifyIcon's visibility to true. You'll need to add a context menu as well so your tray icon has funtionality but that's the basics.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: how can i minimize my program i the sytem try ?

Giorgi Dalakishvili9-Apr-09 0:16

Giorgi Dalakishvili

9-Apr-09 0:16

You can use NotifyIcon to show icon in the system tray. To hide your form, call Hide() method.

Giorgi Dalakishvili

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Re: how can i minimize my program i the sytem try ?

jaypatel5129-Apr-09 20:46

jaypatel512

9-Apr-09 20:46

And one more thing..
You need to set show in taskbar set to false;

Create dll

Trih8-Apr-09 23:55

Trih

8-Apr-09 23:55

Hello,
I have a problem which shouldn't be one really. I need to convert a program to a dll but when I compile it with csc I get an empty dll (checked with DumpBin.exe).

I created a small test class and compiled a dll from it but I cannot invoke the method using Dllimport, it says it cannot find an entrypoint named testMethod.

The code:

test.cs:

using System;
namespace test
{
	public class test
	{
		public string testMethod()
		{
			return "test";	
		}
	}
}

dllTest.cs:

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices; 

namespace dllTester
{
	public class dllTester
	{
		[DllImport(@"test.dll", EntryPoint = "testMethod")]
		static extern string testMethod();
		static void Main(string[] args)
		{
			Console.WriteLine(testMethod());
			Console.ReadKey();
		}
	}
}

I compile test.cs: csc /t:library /out:test.dll test.cs without any errors or warnings.
I compile dllTester: csc /out:dllTester.exe dllTester.cs without any errors or warnings.

When I try to run dllTester I get this:

Unhandled Exception: System.EntryPointNotFoundException: Unable to find an entry point named 'testMethod' in DLL 'test.dll'.<br />
   at dllTest.dllTester.testMethod()<br />
   at dllTest.dllTester.Main(String[] args)

Any ideas?

Br
Trih

Re: Create dll

stancrm9-Apr-09 0:08

stancrm

9-Apr-09 0:08

Do you want to use a .NET Dll in a .NET Application, but using DllImport ??

Re: Create dll

Giorgi Dalakishvili9-Apr-09 0:08

Giorgi Dalakishvili

9-Apr-09 0:08

As far as I know DllImport works with unmanaged assemblies, while your code produces a managed one.

Giorgi Dalakishvili

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Re: Create dll

dojohansen9-Apr-09 0:34

dojohansen

9-Apr-09 0:34

First of all, I think the previous poster is correct - DllImport is definitely meant for unmanaged libraries, like the Windows APIs, and not managed (.net) ones like yours. I can't say for sure that it cannot be used with managed assemblies, but I doubt it - there are better ways to do this you see.

That having been said, your DLL does not have any entry points! Entry points are necessarily static, and your library only contains a class with an instance method.

If you wanted to "convert" the program to a DLL in order to make it available to non-.NET clients there is presumably a way, but I don't know what it is (Google is your friend though).

If you just want to use the assembly in other .net applications, the simplest is of course to just add a reference to it. But if you want to load assemblies dynamically (this can be useful for things like a plug-in architecture) you should have a look at the Assembly class and in particular the Load() method. There's lots of goodies here and you can easily do things like discover all classes that implement certain interfaces or derive from particular classes. Smile | :)

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