Re: Quiz Application In c#.net - C# Discussion Boards

13-Jan-11 9:39

LPXYZ
word cont*aining an asterisk

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

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test (just ignore)

Luc Pattyn13-Jan-11 9:39

test (just ignore) [modified]

13-Jan-11 9:39

LPXYZ
word cont3aining a digit

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Luc Pattyn13-Jan-11 9:40

13-Jan-11 9:40

LPXYZ
words containing a period
for.each
object.field
object.method(parameter)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

modified on Thursday, January 13, 2011 3:46 PM

test (just ignore)

Luc Pattyn13-Jan-11 9:56

Quiz Application In c#.net

13-Jan-11 9:56

LPXYZ double
words containing a period
for.each
object.field
object.method(parameter)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

varun.g4-Jan-11 23:03

varun.g

4-Jan-11 23:03

Hi developers

I want make a quiz program.
It use image recognition (recon the person from the given image) also.Every questions have a four options as answers.And the entire quiz is controlled with timer.Means it must end within the given time.Am really doubtful in so many factors.I searched many in CodeProject,but couldn't find an appropriate application to study.If you have any idea please help me.

I need help to build it in c#.net

varun

JF20154-Jan-11 23:16

JF2015

4-Jan-11 23:16

Hi,

the trickiest part will be the face detection. Here are two articles that describe some basics:

Face Detection in C#[^]

Face and Eyes Detection Using OpenCV[^]

You would need to capture an image with a webcam and try to recognize a face that is stored somewhere (image file or just in database). The whole quiz-timer thing should be quite simple. Try to break down your problem in simple tasks and solve them step for step.

varun.g4-Jan-11 23:33

varun.g

4-Jan-11 23:33

Thanks first

Your help is so much valuable for me.but still i am confused in making that to work with in the given time.Can you point me to any c# source codes available

JF20155-Jan-11 2:05

JF2015

5-Jan-11 2:05

There is no ready to use source code that will do your task. This is why you need to develop it on your own. Try to learn about face recognition and the use of timers to control your quiz flow.

varun.g5-Jan-11 16:48

varun.g

5-Jan-11 16:48

Thanks again

I will try to do that,and update it here

backgroundWorker

arkiboys4-Jan-11 22:34

4-Jan-11 22:34

In the windows service, here is how I have setup the backgroundworker.

Question.
I do not know why the backgroundworker_progresschanged event does not get called.
Do you see what the problem is please?
Thanks

private BackgroundWorker backgroundWorker;

protected override void OnStart(string[] args)
        {
backgroundWorker = new BackgroundWorker();
                backgroundWorker.WorkerSupportsCancellation = true;
                backgroundWorker.WorkerReportsProgress = true;
                backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker_DoWork);
                backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker_ProgressChanged);
                
                backgroundWorker.RunWorkerAsync();
}

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            
        }

private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {      
        }

JF20154-Jan-11 22:39

JF2015

4-Jan-11 22:39

You have to call the ReportProgress method. This fires the progress changed event.
See here for more information:

http://msdn.microsoft.com/de-de/library/ka89zff4.aspx[^]

Pete O'Hanlon4-Jan-11 22:41

Pete O'Hanlon

4-Jan-11 22:41

I don't want to seem as though I'm being funny here, but how would it report progress. You have no functionality in your DoWork to report progress from. In your DoWork, you'd need to report progress using something like the following:

BackgroundWorker worker = sender as BackgroundWorker;
worker.ReportProgress(10);

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arkiboys4-Jan-11 23:17

4-Jan-11 23:17

Thanks for the reply...
I have read afew articles regarding the backgroundworker.
I am not sure if I am asking the correct question here, but my purpose is to make the backgroundworker to do some checking every few miliseconds.
1-
It seems to me that the checking has to be done in the progresschanged event. Am I correct?
2-
Where do I set the time interval in the backgroundworker?

Thank you

Pete O'Hanlon4-Jan-11 23:32

Pete O'Hanlon

4-Jan-11 23:32

The purpose of the background worker is to run a task in the background. The purpose of the progress changed event is to indicate that some progress has been made, so you'd typically use this to update the UI to indicate that a task is working successfully. I wouldn't use a background worker for the purpose you want to - you'd be better off using a timer.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

arkiboys4-Jan-11 23:44

4-Jan-11 23:44

I did think about a timer at first but I do not think it is a good decision because of the following:
1-
There is a separate event which gets fired everytime a new message is received (i.e. every few milliseconds).
At this time, a collection is populated with the data being recieved in the above event.

2-
I am thinking of having a separate thread in the windows service to constantly check the collection and delete items where necessary...

What do you think?

Thanks

DaveyM695-Jan-11 0:55

DaveyM69

5-Jan-11 0:55

The checking can be done on the background thread which the DoWork event is called on and any updates to the UI can be done by reporting progress.

Two problems here:
Once the DoWork handler method returns then the RunWorkerCompleted event fires and the thread will be closed so you would either need to a. Ensure the DoWork handler never returns or b. start a new BackgroundWorker/restart from the RunWorkerCompleted handler. This is why Pete suggested a timer as it can raise an event on a background thread periodically for you.

The background thread is going to be chewing up processor cycles if you just loop in your DoWork handler - this isn't a good idea! Sleeping the thread on each loop may be a quick solution to this - but still a timer makes more sense.

Dave

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arkiboys5-Jan-11 1:08

how to fire form_activated event in MDI Child Form...

5-Jan-11 1:08

ok, thank you.

Manish_Kumar_Nayak4-Jan-11 21:27

Manish_Kumar_Nayak

4-Jan-11 21:27

hi,

I have a MDI Parent From, MDI Child Form & a third Dialog Form.
I call a third Form by clicking a button using ShowDialog() placed in MDI Child.
I like to refresh MDI Child after closing that third Form...

but after closing of third Form,
MDI Parent fired Activated event instead of MDI Child ...!

Give the solution...

Re: how to fire form_activated event in MDI Child Form...

Eddy Vluggen5-Jan-11 0:09

Eddy Vluggen

5-Jan-11 0:09

Manish_84 wrote:
I call a third Form by clicking a button using ShowDialog() placed in MDI Child.
I like to refresh MDI Child after closing that third Form...

The ShowDialog method is blocking; you can refresh your MDI child right after the line where you show the dialog. Once the dialog is closed, execution will continue there.

Manish_84 wrote:
Give the solution...

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Simple Unzip of zip file containing multiple files and folders [modified]

arun_pk4-Jan-11 19:46

arun_pk

4-Jan-11 19:46

please advice me a simlple unzip method in C#
other than using Shell object...
note : zip file contains files and multiple folders

modified on Wednesday, January 5, 2011 1:57 AM

Hiren solanki4-Jan-11 19:50

Hiren solanki

4-Jan-11 19:50

What about THIS[^] ?

Regards,
Hiren.

My Recent Article: - Way to know which control have raised a postback
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arun_pk4-Jan-11 19:55

arun_pk

4-Jan-11 19:55

this will help me to unzip multiple folders??

Hiren solanki4-Jan-11 19:57

Hiren solanki

4-Jan-11 19:57

Yes it is.

If you can unzip one folder then further you can unzip any number of folders, There are lot of features in a language of looping, Just change your program accordingly.

Regards,
Hiren.

My Recent Article: - Way to know which control have raised a postback
My Recent Tip/Trick: - Building Hierarchy using Recursive CTE