Re: trim byte[] to new size - after socket.receive - C# Discussion Boards

trim byte[] to new size - after socket.receive

10-Aug-03 9:57

well you cant really force the GC to run your just asking it to.

implement the dispose method on those references and set them to null so you can force the release.

make sure no other object holds a reference to it or it will not release. Much like the old com refernece counter.

nick

I'm not an expert yet, but I play one at work. Yeah and here too.

MeisterBiber9-Aug-03 23:27

MeisterBiber

9-Aug-03 23:27

Hello !

is there an efficient way to trim a byte[] to a new size?

i need this for a socket.receive:
byte[] data = new byte[1024]; //Input-Buffer
int recv = s.ReceiveFrom(data,ref sender);

i tried this:
byte[] trimmedData = new byte[recv];
for (int i = 0;i

Taka Muraoka9-Aug-03 23:51

Taka Muraoka

9-Aug-03 23:51

The best way to do this is to use a vector<byte> and then you can just use resize().

[edit]
Whoops. Thought I was in the C++ forum. Sorry Blush | :O

[/edit]

"Sucks less" isn't progress - Kent Beck [^]

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Nick Seng10-Aug-03 17:28

Nick Seng

10-Aug-03 17:28

I read the first line and thought," WHOA, we can do vectors in C# ??? Confused | :confused:

God, I pity me! - Phoncible P. Bone

If I end up Windows ME someone is going to be hurting. - One of the answers to a question for What OS are you

Anthony_Yio11-Aug-03 2:00

Anthony_Yio

11-Aug-03 2:00

lol

Sonork 100.41263:Anthony_Yio

Ista10-Aug-03 13:14

Re: control the connection

10-Aug-03 13:14

byte[] trimmedData = new byte[recv];

Array.Copy(data, 0, trimmedData, 0, trimmedData.Length );

I'm not an expert yet, but I play one at work. Yeah and here too.

control the connection

Ahmed Mazrou39-Aug-03 17:16

Ahmed Mazrou3

9-Aug-03 17:16

hi i wanna ask about how can i control the connection of the internet of a pc within lan(lased line)
i mean how can i pause and restore the connection again in this pc

HINT: again the connect isn't dial up connection
it is lased line and all computers connected by network and the

connection of the internet within this lased line

thank you and i hope u can help me

Ahmed Mazrou3

Ista10-Aug-03 10:18

Please help decipher this MSDN threading sample!

10-Aug-03 10:18

your going to need to use the wininet.dll to control internetconnect and few other functions from that library

http://www.c-sharpcorner.com/vbnet/vbcode/CallingWinInetVK.asp

This shows some examples

I'm not an expert yet, but I play one at work. Yeah and here too.

IF STATMENT

eggie59-Aug-03 17:01

eggie5

9-Aug-03 17:01

Here's my class...

using System;
using System.Windows.Forms;

namespace GPG__
{

	/// <summary>
	/// Summary description for logging.
	/// </summary>
	public class logging
	{
		LOG logForm=new LOG();
		aOut caller=new aOut();
		Form1 guiForm=new Form1();

		int k;
	
		public logging(string [] aLog, string start, string end, string duration, int delay, string file)
		{
			logForm.Show();
			
			logForm.listBoxLog.Items.Add(DateTime.Now.ToString("hh:mm:ss")+": Processing: "+file);

<big>			if(guiForm.checkBoxEnableDelay.Checked==true)
			{
				MessageBox.Show("CHECKED");
				logForm.listBoxLog.Items.Add(DateTime.Now.ToString("hh:mm:ss")+": Delay "+delay.ToString());
			}
			else
			{
				MessageBox.Show("NOT CHECKED");
			}</big>			
for (k=1; k<aLog.Length; k++)
				
				logForm.listBoxLog.Items.Add(DateTime.Now.ToString("hh:mm:ss")+": ["+aLog[k].ToString()+"]");
		}
	}
}

Now, look at the if statment asking if checkBoxEnableDelay is checked...

When ever I run this, it always evaluates to false, and the else stament runs... and yes, the box IS checked...

If I put the same code on my main FORM it runs fine...

WHat is the problem?

p.s. (ignore the broken for statment at the bottom... it's not like that in my code..._)

/\ |_ E X E GG

Re: IF STATMENT

eggie59-Aug-03 17:41

eggie5

9-Aug-03 17:41

hmm... I think it has somthing to do with if the check box is checked at form load, or not...

cause if I set the checkbox to checked in the PROPERTY EXPLORER, the if statment elvaluates to true. But if I un check it in the RUNNING FORM, it still evaluates to true...

and it's the same vice versa... if I uncheck it in the PROPERTY EXPLORER, it will elvauate to false, even if I CHECK it in the running FORM...

any ideas?

/\ |_ E X E GG

Re: IF STATMENT

Csharp™10-Aug-03 0:25

Csharp™

10-Aug-03 0:25

it's because you are declaring a " new " instance of Form1

eggie5 wrote:
Form1 guiForm=new Form1();

Form1 guiForm=new Form1();
..............................

why not add the checkbox to the logging sub, eg:

public logging(string [] aLog, string start, string end, string duration, int delay, string file,CheckBox cb)<br />
if(cb.Checked==true)<br />

Re: IF STATMENT

eggie510-Aug-03 18:23

eggie5

10-Aug-03 18:23

Thank you thank you.

your are a good man.

/\ |_ E X E GG

devvvy9-Aug-03 16:26

devvvy

9-Aug-03 16:26

Thanks for taking time to respond to my question. I'm going over a threading sample from MSDN and is having a hard time trying to understand the sample:
(a) Monitor.Wait
(b) Monitor.Pulse
(c) waiting Vs ready queue in context of threading
(d) Why you need to add a "readerFlag" in the resource you are acquiring a lock on when you have already locked the resource using "lock( )" statement.

Before going further, reference to MSDN here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vcwlkthreadingtutorial.asp

QUESTION 1:
"A lot of times there are a couple of steps to locking an object"
>> Q1-a: I don't get it. To lock and unlock an object:

Monitor.Enter(thisObj); //This won't return until you get the lock
thisObj.DoSomething();
Monitor.Exit(thisObj);

To try to lock and obj, use Monitor.TryEnter instead. But, in our MSDN sample:

public void WriteToCell(int n)
{
lock(this) // Enter synchronization block: The "lock()" block.
{
if (readerFlag)
{ // Why do you need this flag if you have already "lock" the resource???
}

} // Q1-b: Lock release here - my understanding correct?? This means you can do whatever you want in the "lock" block.? (Exiting THE "lock()"-block)

}
}

>> Q1-c: Once you acquire the lock (via Monitor.Enter or lock() function as in sample), NO other thread can acquire lock on "thisObj" until "Monitor.Exit". There's NO need for "readerFlag".

QUESTION 2:
Quote:
"Now that the cook is done, you go "hey over there, it's my turn! No one else is allowed to cut in front of me!" so you call
[
Monitor.Wait(this);
]"

>> Q2-a: Doesn't Wait function surrender lock to resource to next thread in "waiting queue". According to MSDN, Wait() does this:
* "Releases the lock on an object in order to permit other threads (in waiting queue) to lock and access the object."
* "Releases the lock on an object and blocks the current thread until it reacquires the lock."
My question is, why release lock BEFORE you actually do something (Read) with reseource?

public int ReadFromCell( )
{
lock(this) // Enter synchronization block: The "lock()"-block
{
if (!readerFlag) //WhY?? You ALREADY have the lock on "this" resource.
{
try
{
// Again, WHY!? You ALREADY have lock on "this" resource.
Monitor.Wait(this);
}
... catch statements...
}
Console.WriteLine("Consume: {0}",cellContents); //Q2-b: NOW you're reading - but why can't you read immediately after "lock(this)" statement???

readerFlag = false; // Q2-c: I have no idea why we need this flag.
// is done.
Monitor.Pulse(this); // Q2-d: I have no idea why we need to pulse - exitining the "lock()" block surrender the lock, other threads waiting for the resources will naturally be able to acquire it once execution exit the "lock()" block, why Pulse???

} // Exit synchronization block: The "lock()"-block
return cellContents;
}

>> Q2-f: waiting queue Vs ready queue - What the... It's in Monitor class documentation (.NET framework).

Help!

Re: Please help decipher this MSDN threading sample!

Meysam Mahfouzi10-Aug-03 17:31

Meysam Mahfouzi

10-Aug-03 17:31

I think by only changing one variable name you will get out the confusing situation you are in!;)

Just change 'readerFlag' name to 'dataAvailable'
You see? every thing's now clear, huh?

norm wrote:
public void WriteToCell(int n)
{
lock(this) // Enter synchronization block: The "lock()" block.
{
if (readerFlag)
{ // Why do you need this flag if you have already "lock" the resource???
}

} // Q1-b: Lock release here - my understanding correct?? This means you can do whatever you want in the "lock" block.? (Exiting THE "lock()"-block)

}
}

Suppose you want to read the cell, so you lock it, and you may see nothing is available in cell, so what should you do? Ahhhhaaaa, you should release the lock and wait until the writer puts some thing in cell and signals you to wake up, again acquire the lock and read the cell.

the same happens for writer, if cell is full, it will wait untill reader reads the cell.

I hope this helps Smile | :)

Don't forget, that's

Persian Gulf

not Arabian gulf!

Re: Please help decipher this MSDN threading sample!

devvvy11-Aug-03 2:56

devvvy

11-Aug-03 2:56

Well explained, let me go back and see if I truely understand it. Thanks.

norm

Re: Please help decipher this MSDN threading sample!

devvvy13-Aug-03 6:57

devvvy

13-Aug-03 6:57

Thanks a lot, gone thru the sample today.

norm

WSDL question

Mazdak9-Aug-03 9:52

Mazdak

9-Aug-03 9:52

When I developing my webservice can I edit WSDL file? I can't find this file in the folder of XML application.It create in my consumer application when I addd reference to it, so does this file create on the server?

Mazy

No sig. available now.

James T. Johnson9-Aug-03 11:27

James T. Johnson

9-Aug-03 11:27

The WSDL is generated by passing a parameter to the webservice's .asmx file.

For the CP webservice (http://www.codeproject.com/webservices/latest.asmx) the WSDL is at: http://www.codeproject.com/webservices/latest.asmx?WSDL

Mazdak wrote:
When I developing my webservice can I edit WSDL file?

I don't think so, I think .NET always generates the WSDL file based on what the webservice offers.

James

"My words but a whisper -- your deafness a SHOUT.
I may make you feel but I can't make you think." - Thick as a Brick, Jethro Tull 1972

Ista9-Aug-03 12:13

9-Aug-03 12:13

Do a search for the wsdl file

or using the .net prompt type
wsdl /language:CS /out:<filename>.cs <webservicename>.wsdl

this creates your wsdl file or just do a serach for *.wsdl

its an xml file so you can easily edit it in vs, notepad, xml spy or whatever although I dont know of any valid reason to.

you can do it throuogh the IDE and then just edit it there

nick

I'm not an expert yet, but I play one at work. Yeah and here too.

Mazdak10-Aug-03 1:54

Mazdak

10-Aug-03 1:54

Thanks for reply james.

Ista wrote:
you can do it throuogh the IDE and then just edit it there

But where can I save it? When user request it how can I force VS.NET use my wsdl, not create its own version?

Mazy

No sig. available now.

Ista10-Aug-03 9:53