Re: Synchronizing Mulithreaded Loops - C# Discussion Boards

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Re: How to make setup & deploy a Pocket Pc application

Raza Hussain26-Jul-07 2:00

Raza Hussain

26-Jul-07 2:00

Thanks Jalpesh B. Patel.
Dear Patel i found Add Project output Group empty after so how do i achieve this; "In the File System pane, right-click Application Folder and select Add—>Project Output…. Add Project Output Group window, select Primary output set Primary output."
Thanks again
waiting for your response.

playing video files?

Tarun.Suneja25-Jul-07 4:07

Tarun.Suneja

25-Jul-07 4:07

i am working with a project likely to be a media player.
can sum one tell me how to play video files in c#?
which namespace to be included?
which class to be used?

with thanks...

Re: playing video files?

ashukasama25-Jul-07 4:21

ashukasama

25-Jul-07 4:21

Namespace: System.Media

http://msdn2.microsoft.com/en-us/library/system.media.aspx

Smile | :)

Re: playing video files?

Tarun.Suneja25-Jul-07 4:37

Tarun.Suneja

25-Jul-07 4:37

System.Media just contain classes for Sound Player but not 4 vido files. If u know how to play video files , can u give me a short codes

Re: playing video files?

ekynox25-Jul-07 4:50

ekynox

25-Jul-07 4:50

You should look into WPF it has some fantastic ability to handle media files. Try this article
http://msdn.microsoft.com/msdnmag/issues/07/03/DigitalMedia/default.aspx

Synchronizing Mulithreaded Loops

Salamandras25-Jul-07 4:05

Salamandras

25-Jul-07 4:05

Greetings
I am trying to make threads that run loops to be at the exact same step as the other threads. For example an output to the application could be the following:

Thread 1 = iteration 1
Thread 2 = iteration 1
Thread 3 = iteration 1
Thread 4 = iteration 1
Thread 1 = iteration 2
Thread 2 = iteration 2
Thread 3 = iteration 2
Thread 4 = iteration 2
and not
Thread 1 = iteration 3
Thread 2 = iteration 2
Thread 3 = iteration 1
Thread 4 = iteration 1
Thread 1 = iteration 4
Thread 2 = iteration 3
Thread 3 = iteration 2
Thread 4 = iteration 1

I am thinking of an implementation such as:
the first thread runs the iteration and waits
the second thread runs the iteration and waits...
the last thread runs the iteration and notifies all the other threads to wake (and go to the next step)
I have tried the following but it doesnt work:

<br />
CommonClass commonObject = (CommonClass)o;//a public object created in Main for all the threads to acquire lock to<br />
        for (int i = 0; i < 4; i++)<br />
        {<br />
            Console.WriteLine("Thread " + Thread.CurrentThread.Name + " is in iteration " + i);<br />
            lock (commonObject)<br />
            {<br />
                if (Interlocked.Decrement(ref threadCounter) == 1)//last thread <br />
                {<br />
                    threadCounter = 4;//reset the counter<br />
                    Monitor.PulseAll(commonObject);//notify all the other threads to wake<br />
                }<br />
                else { Monitor.Wait(commonObject); }//or wait until notified<br />
            }            <br />
        }<br />

Do you find this approach correct?
Can you please suggest feasible solution?

Thanks in advance

Re: Synchronizing Mulithreaded Loops

PhilDanger25-Jul-07 4:37

PhilDanger

25-Jul-07 4:37

Disclaimer: although I have studied threading, I am no guru, so take my suggestion with a grain of salt.

Also I'm not sure of .NET threading syntax, so everything will be in pseudocode.
---

Have one thread act as a scheduler for the rest of the threads, telling them when they are allowed to run.

1. Start running each thread.
2. When a thread completes an iteration, tell it to Wait on some condition variable that is regulated by the scheduler thread.
3. The scheduler thread will do nothing until the wait queue is "full" IE all available thread are waiting, or the "running" queue is empty.
4. The scheduler broadcasts to all waiting threads, telling them to wake up and start running.

Re: Synchronizing Mulithreaded Loops

pbraun25-Jul-07 12:48

pbraun

25-Jul-07 12:48

To do what you want you can use a locking mechanism on a data object and start the threads in order. Essentially the locking mechanism causes a side effect of putting the threads in the order that they are received at the lock.

HOWEVER, the order that the threads arrive at the lock is not guaranteed and thus your program may not run the order that you want.

I don't understand why you would use separate threads if the order that these operations be done is critical. If the order is critical, then you should use a single thread to process the operations in order to guarantee the order.

Phil

Tab Controls...How can I select a Tab with a keyboard press? plz help

flyingnome25-Jul-07 4:03

flyingnome

25-Jul-07 4:03

hello C# community,

I have a windows form with a tab control in it, that acts as the container for 6 or 7 tabs. I would like to add shortcut functionality, so that when a user presses the F3 key on the key board it will go to tab1 of the tab control, F4 to tab2 of the tab control.....and so on.

I know I read how to do this somewhere, I have been having trouble locating where that was. Is it a property on the individual tab page or is it in the tabcontrol?

perhaps someone knows off the top of their head.

thanks in advance,
FG

-- modified at 10:38 Wednesday 25th July, 2007

I am who I am because of who everyone around me is.

[Message Deleted]

flyingnome25-Jul-07 6:53

flyingnome

25-Jul-07 6:53

[Message Deleted]

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help

Dave Kreskowiak25-Jul-07 7:22

Dave Kreskowiak

25-Jul-07 7:22

Impatient, aren't you?

This board is supported by volunteers who do this on their own time, not yours. You're not paying for support, so why are you bitching that you're not getting it fast enough??

Enable the KeyPreview property of your form, then handle the form's KeyDown event. Check for the hot keys you want and show the appropriate tab depending on which key was hit.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help

Paul Conrad25-Jul-07 7:40

Paul Conrad

25-Jul-07 7:40

Dave Kreskowiak wrote:
You're not paying for support, so why are you bitching that you're not getting it fast enough??

I could give him a rather drawn out solution, but he'd have to pay up to me through PayPal first. Oh and by the way, my solutions are As-is, no refunds Poke tongue | ;-P

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help [modified]

flyingnome25-Jul-07 8:16

flyingnome

25-Jul-07 8:16

relax...I just thought it was not such a hard question for this tremendous community.... In any case, I did not think that my post was particularly "rude", if I offended you or anyone else here at Code Project, my sincerest apologies.
Why does everything have to boil down to money. No I am not paying for support, but I am not paying for you to scowl me because I added a short comment to my own post. A great part of being part of a community is knowing how to interact in a community.

just like you, I am a volunteer as well, and where I can, I help people that need the help.

-- modified at 15:16 Wednesday 25th July, 2007

-- modified at 15:26 Wednesday 25th July, 2007

I am who I am because of who everyone around me is.

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help [modified]

flyingnome25-Jul-07 8:18

flyingnome

25-Jul-07 8:18

P.S. a simple "I don't know" would have sufficed.....but thanks for your help anyhow.

-- modified at 15:15 Wednesday 25th July, 2007

I am who I am because of who everyone around me is.

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help

Dave Kreskowiak25-Jul-07 13:51

Dave Kreskowiak

25-Jul-07 13:51

flyingnome wrote:
P.S. a simple "I don't know" would have sufficed

How does "Turn the form's KeyPreview on and handle its KeyDown event..." translate to "I don't know how to solve your problem"?? Sounds like a solution that works to me...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help

flyingnome26-Jul-07 3:33

flyingnome

26-Jul-07 3:33

thanks Dave.

I am who I am because of who everyone around me is.

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help

Paul Conrad25-Jul-07 7:38

Paul Conrad

25-Jul-07 7:38

flyingnome wrote:
Is there really no one that knows how to do this?

Give people time to respond if they know. Impatience like that only is going to piss people off and allow them to be less likely to answer your question.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Tab Controls...How can I select a Tab with a keyboard press? plz help

flyingnome25-Jul-07 8:20

flyingnome

25-Jul-07 8:20

Paul Conrad wrote:
Impatience like that only is going to piss people off

I didn't mean to piss anyone off.....just needed some help....sorry if you read the post and wanted to kick your dog.

I am who I am because of who everyone around me is.

on click enter button

vikas198225-Jul-07 3:34

vikas1982

25-Jul-07 3:34

I have a login page that contains user id and password and then a button called ok...

My problem is after typing tha password i have to click the oke button... now i want this to happen on click of any button...like enter

please help me i am new to c#

Thanks Vikas

Re: on click enter button

ashukasama25-Jul-07 3:48

ashukasama

25-Jul-07 3:48

There is property on the form, not the button.
After adding the button to the form, on the form set the AcceptButton property on the form. You also have a CancelButton property.

all can be done in form load

IButtonControl ib = (IButtonControl )button1;
this.AcceptButton = ib;

similarly others

Smile | :)

Re: on click enter button

vikas198225-Jul-07 4:31

vikas1982

25-Jul-07 4:31

i am doing all this

this.DialogResult = DialogResult.ok
this.Hide();
this.Dispose(true);

Now here this is happening on click the ok button

this i want to happen on click of enter button

Thanks in advance..
vikas

Re: on click enter button

ashukasama25-Jul-07 4:35

ashukasama

25-Jul-07 4:35