C# Discussion Boards - CodeProject

haha200014-Mar-05 15:39

haha20001

4-Mar-05 15:39

the end i use two threads to ping more hosts.
one thread calls sendto function,the other calls receivefrom.
if i ping one host twice in one cycle,and the first time it costs 56ms,and the second time costs 1ms,why?

Re: ping use too long time

Dave Kreskowiak4-Mar-05 16:15

Dave Kreskowiak

4-Mar-05 16:15

Look at what your timing! THe code as you wrote it, will time the DNS lookup of the host, the building of the ICMP Packet, opening the socket connection, sending the echo packet, ...

You're not timing the packet travel time, you're timing nearly your entire application from the time you hit enter to the time it takes for the first echo packet to come back. The only thing you weren't timing was how long it took to parse the command line parameters.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: ping use too long time

haha200015-Mar-05 6:08

haha20001

5-Mar-05 6:08

i have correct it,record the time just before sending the packet,
but the time costed is 56ms too

Re: ping use too long time

Dave Kreskowiak5-Mar-05 6:17

Dave Kreskowiak

5-Mar-05 6:17

Somehow, I doubt it. On top of that, unless you rewrite this code so you setup EVERYTHING you need to send and receive the packet, without doing anything in between the two, your still timing code to setup the receive.

The only thing that'll get the timing down to <10ms on loopback, is to rewrite the code so it's far more efficient. And from what I've seen, you've got a bunch of work to do.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Authorisation Code Ideas?

Tom John4-Mar-05 3:18

Tom John

4-Mar-05 3:18

Hi
I am looking for a new way to licence our products. We currently ask the user to enter a company name, plus a load of parameters (such as package limits, number of users, expiry date, etc) which are then validated against an authorisation code we provide.

Each of our products have different parameters that relate to the functionality of that product, and as functionality increases, the number of parameters is also increasing.

Therefore, i am attempting to come up with a system that allows the user to enter just two bits of information, the Company Name and an Authorisation Code. The authorisation code is validated against the compan name and then the licence information is extracted out of the authorisation code.

It sounds great in principle, but i've no idea where to start on this, or if it is at all possible.

Any ideas or suggestions would be greatly appreciated.

Thanks

Tom

utf8 convert....

ABBASI_RA4-Mar-05 3:07

ABBASI_RA

4-Mar-05 3:07

hi i have a sqldb with unicode data column.(nvarchar)
i search the user data entry in textbox in webpage , in database.
please tell me how to convert string to utf8 charset?

thanks

Authentication/Sql Server and C#

C# Angel4-Mar-05 2:56

C# Angel

4-Mar-05 2:56

Hello All,

I am writing an application using c#. This is a client server application. I am trying to make a login box which would allow users to enter the windows user id and password. Then I would like to check that user id and password against what the user id and password of who is login onto the machine. After that I would then like to check that user id and password against the sql server database to see if they have permission to access the database. Please someone provide guidance. I have looked everywhere and no one seems to have an answer to this question! Thanks

Re: Authentication/Sql Server and C#

Colin Angus Mackay4-Mar-05 6:14

Colin Angus Mackay

4-Mar-05 6:14

This is not good policy - If your users already log into Windows at the start of the session then you should consider that they have already passed through an authentication mechanism. Asking then to log on again during as session will desensitise them to providing a user name and password whenever prompted so that eventually they will do it automatically without thinking (that's how phishing scams work - they prey on the psycology of the person just following a set of instructions blindly - so don't encourage them for goodnesssake!).

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Re: Authentication/Sql Server and C#

Anonymous15-Mar-05 10:05

Anonymous

15-Mar-05 10:05

O.k. Thanks for your help

Still no solution :(

Radgar4-Mar-05 2:43

Radgar

4-Mar-05 2:43

Friends,
I've been searching for a solution to a problem for 2 days on Google and forums but couldn't succeed. The problem is how do I get the ListView selection highlight style as it is in VS .NET menus. There is an article "TreeListView" here http://www.codeproject.com/cs/miscctrl/treelistview.asp[^] that has this feature but it's a little complicated for me to distinguish this feature from rest of the code.

This is my 3rd post on the same subject and will be the last - so please forgive me.
Thanks.

Radgar
"Imagination is more important than knowledge." - Albert Einstein

Re: Still no solution :(

Dave Kreskowiak4-Mar-05 4:28

Dave Kreskowiak

4-Mar-05 4:28

There is no such property. The control uses the system's Display Properties/Appearance colors to draw the highlights.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Still no solution :(

Radgar4-Mar-05 8:37

Radgar

4-Mar-05 8:37

Dave, thanks for your time but I never said the control has the property. If it had, I'd never have asked this question, would I? The control can be inherited and/or custom-drawn via some Windows APIs or so.. I know it's possible and I gave a link of an example actually. But that example has too crowded code which is hard for me to pick the parts I need. Don't get me wrong but please read the post fully next time before answering because now my post seems like answered to other users who possibly has the correct solution I need.

Radgar
"Imagination is more important than knowledge." - Albert Einstein

Re: Still no solution :(

Dave Kreskowiak4-Mar-05 11:02

Dave Kreskowiak

4-Mar-05 11:02

Radgar wrote:
Don't get me wrong but please read the post fully next time before answering because now my post seems like answered to other users who possibly has the correct solution I need.

I did. The solution IS to ownerdraw the entire control and use the colors you want, not the system. If the example that you found is too much to wrap your brain around all at once, pick it apart. Try certain things and see what they do. Because nearly all of what you saw in the example is what your going to have to go through to get the functionality you want. The question you show now be asking yourself is "Is this worth it?"

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

I need some information

iceburnbarry4-Mar-05 2:36

iceburnbarry

4-Mar-05 2:36

I need information about web pages that rent coders.
Thanks for your time Smile | :)

Re: I need some information

Dave Kreskowiak4-Mar-05 7:29

Dave Kreskowiak

4-Mar-05 7:29

The Code Project isn't one of them. Thank you Chris!

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Socket and Struct

James Poulose4-Mar-05 2:35

James Poulose

4-Mar-05 2:35

Hi,
I have two sockets and i want to transfer a struct object.How can i convert object to binary abd vice versa?Thanks for you time.
Cool | :cool:

Wanna be C#

Re: Socket and Struct

felopater4-Mar-05 4:50

felopater

4-Mar-05 4:50

hii,that's too simple in c# first add Serializable attrubite before your struct
[Serializable]
struct YourStruct
{..}if struct also contains (nested) other structs objects. thier structs also must have Serializable attrubite then
using System.Runtime.Serialization.Formatters.Binary;
using System.IO
BinaryFormatter bin=new BinaryFormatter();
MemoryStream memory=new MemoryStream();
bin.Serialize(memory, yourStructObject);
byte[]data=memory.GetBuffer();//your struct in bytes
//to Reverse operation:
memory=new MemoryStream(data);
memory.Seek(0,System.IO.SeekOrigin.Begin);
yourStructObject=(YourStruct) bin.Deserialize(memory);

marcoryos

Re: Socket and Struct

James Poulose4-Mar-05 23:17

James Poulose

4-Mar-05 23:17

Thank u man..thanks a lot.That was simple and very specific Smile | :)

Network programming

felopater4-Mar-05 1:51

felopater

4-Mar-05 1:51

hii,i want to transfer a file from two hosts using Tcp protocol but the problem is i don't know the suitable transfer rate (the connection speed between those hosts)
felopater

Re: Network programming

Colin Angus Mackay4-Mar-05 2:06

Colin Angus Mackay

4-Mar-05 2:06

That is not a function of Sockets. That is a function of the network device(s) that are being used between the source and destination. Sockets are an abstaction that concentrate on the data being transmitted and received rather than the physical process of sending or receiving data.

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Re: Network programming

turbochimp4-Mar-05 11:05

turbochimp

4-Mar-05 11:05

The previous post is correct. Are you, perhaps, referring to the send and receive buffer sizes instead? That would reflect the largest "chunk" size that could be sent or received by the server and client.

If you're really referring to line speed then there's not a lot you can influence merely by using sockets or not.

The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’

Exception Handling - back into method

Seraphin4-Mar-05 1:25

Seraphin

4-Mar-05 1:25

I have a problem here with an exception.

<br />
try<br />
{<br />
  ... some code ...<br />
  Exception appears here<br />
}<br />
catch(Exception ex)<br />
{<br />
  ... some code ...<br />
  (go back into try block, but how ?)<br />
}<br />

After exception was thrown, application should continue code processing in the try block. Is it possible to avoid processing a special error with given error number ? Otherwise, code processing will be interrupted and application close this process.

Re: Exception Handling - back into method

Chamadness4-Mar-05 1:51

Chamadness

4-Mar-05 1:51

you can try the following Smile | :)

public void HandleException( Exception ex )
{
... Do something, as in old catch ...
... some code ...
}

try
{
... some code ...

try
{
// Where exception appears
}
catch(Exception ex)
{
HandleException( ex )
}
}
catch(Exception ex)
{
HandleException( Exception ex )
}

CodeMadness - Code before you go mad!

Re: Exception Handling - back into method

Colin Angus Mackay4-Mar-05 2:03

Colin Angus Mackay

4-Mar-05 2:03

Seraphin wrote:
application should continue code processing in the try block

Make your try blocks smaller.

So if you have

try
{
    // Do item 1
    // Do item 2
    // Do item 3
}
catch(Exception ex)
{
    // Handle the exception
}

Change it to:

try
{
    // Do item 1
}
catch(Exception ex)
{
    // Handle the exception
}
try
{
    // Do item 2
}
catch(Exception ex)
{
    // Handle the exception
}
try
{
    // Do item 3
}
catch(Exception ex)
{
    // Handle the exception
}

Or a better solution would be to refactor your code so that item 1, item 2 and item 3 individual private methods that get called, each of which has their own try/catch block.

Does this help?

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A perfect example where goto should be used

leppie4-Mar-05 5:19

leppie

4-Mar-05 5:19

RESTART:
try
{
... some code ...
Exception appears here
}
catch(Exception ex)
{
... some code ...
  goto RESTART;
}

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