Multi-Threading Question - C# Discussion Boards

Luc Pattyn12-Mar-09 5:26

12-Mar-09 5:26

Hi,

not sure why I am getting all this, thanks anyway.

some remarks:

1.
either this struct has strict requirements or it has not.
if it has, I doubt it should hold both public byte[] dataSenderBytes; and public string dataSender; // 12
same for public byte[] dataMessageBytes; and public string dataMessage; // 24
if it has not, don't see why it should need a Pack=1 attribute

2.
your problem is with string handling.
in the native world (C, C++) strings consist of 8-bit characters (or 16-bit wide characters) and they end on the first ASCII NULL character (byte value zero), which means the NULL character itself cannot be embedded in a string.
in the managed world strings can contain any character you choose; if you give 12 bytes (dataSenderBytes) to ASCII.GetString() it probably returns a 12-character string of which several could be NULL (or \0).

So I suggest you get the meaningful length of those strings somehow from the byte[] or from the native world, then use ASCIIEncoding.GetString(Byte[], 0, length)

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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Re: Blackhole string!

Nagy Vilmos12-Mar-09 4:19

Nagy Vilmos

12-Mar-09 4:19

Running it within the IDE, put some breakpoints in on the entry to each of your methods.
Step through and see what the values are that are being received.
Maybe instead of:

chatView.Text = chatView.Text + Environment.NewLine + myName + ": "+ myText;

Try:

String newText = chatView.Text + Environment.NewLine + myName + ": "+ myText;
chatView.Text = newText;

Then after newText has been created you can be sure the correct value is going ito the RHS of the expession.
This is debug problem, you just need to establish the values at every step of the process.

Panic, Chaos, Destruction.
My work here is done.

Re: Blackhole string!

Member 349379912-Mar-09 4:30

Member 3493799

12-Mar-09 4:30

Used breakpoints, saw the values and they were correct.

newText was highlighted in red though when I got to the" chatView.Text = newText" (dont know what that means: VS2008).

myName = "test"
myText = "ETST13245"

newText	"\r\Test\0\0\0\0\0\0\0: ETST13245\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"	string

Re: Blackhole string!

Nagy Vilmos12-Mar-09 4:35

Nagy Vilmos

12-Mar-09 4:35

Member 3493799 wrote:
\0\0\0\0\0\0\0

As soon as it's hitting the null char, the display is being truncated.

Panic, Chaos, Destruction.
My work here is done.

Re: Blackhole string!

Member 349379912-Mar-09 4:36

Member 3493799

12-Mar-09 4:36

Cheers, that makes sense, will change it accordingly.

Re: Blackhole string!

Nagy Vilmos12-Mar-09 4:42

Nagy Vilmos

12-Mar-09 4:42

You are welcome. Blush | :O

After yesterday's retardfest it is nice to have a real question to answer.

BTW My first port of call when code is not behaving is to debug the thing to smithereens until I find the problem. My second is a call for Port.

Panic, Chaos, Destruction.
My work here is done.

Re: Blackhole string!

Member 349379912-Mar-09 4:45

Member 3493799

12-Mar-09 4:45

Opening a good old Port may be the solution to many a networking problem Wink | ;-)

Multi-Threading Question

Programm3r12-Mar-09 3:01

Programm3r

12-Mar-09 3:01

Hi all,

I have created a multi-threaded TCP/IP server. Each client connection runs in it's own thread.
The problem that I have it when I close the server and there are still clients connected. The thing is that the client threads remain active.

How can stop / dispose of the client threads so that the server can be closed for good?

Many thanks in advance

Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Multi-Threading Question

musefan12-Mar-09 3:11

musefan

12-Mar-09 3:11

well you need to handle connections when you close down the server.

You should have a list of all connected clients, right?

so you will want to stop incomming connections.
then you can abort all client threads, preferable after sending information to the client about the shut down

Life goes very fast. Tomorrow, today is already yesterday.

Re: Multi-Threading Question

Programm3r12-Mar-09 3:42

Programm3r

12-Mar-09 3:42

musefan wrote:
You should have a list of all connected clients, right?

Yes.

musefan wrote:
then you can abort all client threads

The only thing is that the client threads spawn out of another thread that is listening for any incoming connections. If a new connection is accepted by the listen thread the listen thread spawns a new thread for that connections. Thus I do not have the handle to each of the client threads that have been spawned, well I think so anyway.

Many thanks for your response
Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Multi-Threading Question

Member 349379912-Mar-09 3:44

Member 3493799

12-Mar-09 3:44

Did you use Socket.beginAccept?

Re: Multi-Threading Question

musefan12-Mar-09 3:47

musefan

12-Mar-09 3:47

well you may want to change it so you store you connections somewhere you can access.

you could try using a static collection of threads. that way they can be accessed from both your connection handling thread and you main thread.

Life goes very fast. Tomorrow, today is already yesterday.

Re: Multi-Threading Question

Programm3r12-Mar-09 3:59

Programm3r

12-Mar-09 3:59

Mmmm .... yes I think that can do the trick.

Is it possible to terminate a thread if one has the thread handle?

Thanks again
Regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Multi-Threading Question

musefan12-Mar-09 4:08

musefan

12-Mar-09 4:08

I assuming its system.Threading.Thread, you can use .Abort to end the thread.

Life goes very fast. Tomorrow, today is already yesterday.

Re: Multi-Threading Question

Programm3r12-Mar-09 4:28

Programm3r

12-Mar-09 4:28

musefan wrote:
I assuming its system.Threading.Thread

Yes.

Thanks

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Multi-Threading Question

Luc Pattyn12-Mar-09 4:19

Luc Pattyn

12-Mar-09 4:19

Hi,

if all you need is for the server to be able to stop whenever it wants to, turn all the client-serving threads into background threads by setting their IsBackground property true. FYI: ThreadPool threads and BackgroundWorkers always are background threads, so they can't prevent your app from exiting.

however if you need to communicate with the clients about the imminent shutdown, obviously you would need to keep a list and provide the appropriate code.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: Multi-Threading Question

Programm3r12-Mar-09 5:16

Programm3r

12-Mar-09 5:16

Luc Pattyn wrote:
threads by setting their IsBackground property true. FYI: ThreadPool threads and BackgroundWorkers always are background threads, so they can't prevent your app from exiting.

Thank you for the information. This has helped a lot.

Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Multi-Threading Question

Luc Pattyn12-Mar-09 5:28

Luc Pattyn

12-Mar-09 5:28

You're welcome.

PS: I'd rather not look like this: Green Alien | [Alien]

Luc Pattyn [Forum Guidelines] [My Articles]

Method Error [modified]

Goobashi12-Mar-09 2:34

Goobashi

12-Mar-09 2:34

http://www.pastey.net/110020[^]

The following link is a simple method I created for converting a Directory based string into a compatible Dos string.
It's not working as intended;

The idea was to convert:

C:\test\test this\Example Here\Test Again\

into

c:\test\"test this"\"Example Here"\"Test Again"\

instead the code turns it into

"C:\test\test this\Example Here\Test Again\"

Please help! I'm not sure where I'm going wrong
*richTextBox1.Text += Sections[i] + "\n" + "test";* was a debug line for me.

Thanks,
Colin

modified on Thursday, March 12, 2009 7:40 AM

Re: Method Error

0x3c012-Mar-09 2:48

0x3c0

12-Mar-09 2:48

I posted an alternative unmanaged method which handles this for you automatically in your previous topic

DirectSound Buffer

maerki9012-Mar-09 0:36

maerki90

12-Mar-09 0:36

Hi,
I want to store a lot of sounds in a DirectSound buffer, so how can I do that? I've tried with buffer[][] but it doesn't work. There's an error message that I have to create a new instance! I've tried with:

for(int i = 1; i <= 6; i++)
{
buffer[i][0] = new Buffer("sound/" + i.ToString() + ".wav", device);
}

I think there's no problem with the path of the sound file, because i've tested it with an normal path.

Greeting shainsen

Re: DirectSound Buffer

Xmen Real 12-Mar-09 1:10

Xmen Real

12-Mar-09 1:10

what is the error and post the declaration code of that 2D array. I guess you're getting Object reference not set to an instance of an object.

TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Re: DirectSound Buffer

maerki9012-Mar-09 3:17

maerki90

12-Mar-09 3:17

Yes that's the error. Should I first declarate all the field of the array?

Greetings shainsen

Re: DirectSound Buffer

Xmen Real 12-Mar-09 3:19

Xmen Real

12-Mar-09 3:19

yes

Re: DirectSound Buffer

maerki9012-Mar-09 3:29

maerki90

12-Mar-09 3:29

I'll try. Thx a lot

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