Re: Jagged Arrays Definition - C# Discussion Boards

ZHAOBING_NTU15-Jan-10 19:06

15-Jan-10 19:06

If you run your program locally as a server, you need to install.
I think what you should be careful about is the connecting string of your database file.

ComboBox DropDownWidth behaviour

baranils15-Jan-10 8:36

baranils

15-Jan-10 8:36

Hello

I've just find out a strange behaviour of the ComboBox

If you set the DropDownWidth property of a combo the Width it not activated if the dropdown list is opened by typing text in the combo (SuggestAppend mode)

However if you open the list using the Combo button the given width is taken

And after the width is activated either using the button either by resizing the dropdowlist manualy the width setting remain active until the form is closed

How can I directly set the right width (is there an opening event that I can use)

Thanks for anu suggestion

send mail to yahoo

mohd_mogaly15-Jan-10 6:58

mohd_mogaly

15-Jan-10 6:58

hi men and womans
I want to send mail to yahoo
but some problem occured
as you know I used smtp class
and I wrote the server name for yahoo like that
smtp.mail.yahoo.com
but the an exception with message like that "server dose not support secure connection"
and thanks

Re: send mail to yahoo

dan!sh 15-Jan-10 8:37

dan!sh

15-Jan-10 8:37

Try setting EnableSsl property to false or see this[^] thread.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Jagged Arrays Definition

Sokka9315-Jan-10 5:35

Sokka93

15-Jan-10 5:35

Hello everyone.
As far as I know Jagged array is also called "array of array" does that mean that I can use a definition like int[][][] Jagged Array = new int[3][3][]? And does it mean "array of array of array"?
I mean if I use something like that does it contain 9 arrays in it? if I'm wrong how can I define something like that?
Thanks in advance!

Re: Jagged Arrays Definition

Rick Shaub15-Jan-10 5:52

Rick Shaub

15-Jan-10 5:52

All of your answers can be found on MSDN: http://msdn.microsoft.com/en-us/library/2s05feca.aspx[^]

Re: Jagged Arrays Definition

harold aptroot15-Jan-10 6:27

harold aptroot

15-Jan-10 6:27

Almost, yes it would be "an array of (array of (array of ints))" (with parentheses for extra clearness)
However, you can only create 1 array at the time, so you can make a new int[3][][], but then you'd have to loop over it and fill every entry with a new int[3][]
You would then have 9 places in which you could put an "array of int" (but they are all null) so only 1 + 3 arrays in total (the outer array and the three middle arrays). (until you also create the arrays of ints)

It's not all that useful to do this though (when all sub-arrays have the same length), you might as well make a new int[9][] and index it with [3*i+j] instead of [i][j], which takes much less code (you don't have to fill the outer array with arrays). You could extend this to three dimensions if all arrays of int will be the same length.

Re: Jagged Arrays Definition

Sokka9315-Jan-10 6:34

Sokka93

15-Jan-10 6:34

Thank you so much!

Re: Jagged Arrays Definition

BillWoodruff16-Jan-10 20:42

BillWoodruff

16-Jan-10 20:42

Hi Sokka93,

For an excellent discussion of "jagged arrays" compared to "multidimensional" arrays, see : [^]

For performance comparisons of jagged and multidimensional arrays see : [^]

best, Bill

"Many : not conversant with mathematical studies, imagine that because it [the Analytical Engine] is to give results in numerical notation, its processes must consequently be arithmetical, numerical, rather than algebraical and analytical. This is an error. The engine can arrange and combine numerical quantities as if they were letters or any other general symbols; and it fact it might bring out its results in algebraical notation, were provisions made accordingly." Ada, Countess Lovelace, 1844

Re: Jagged Arrays Definition

Sokka9317-Jan-10 6:03

Sokka93

17-Jan-10 6:03

Thanks!

MultiThread and File process

AlexB4715-Jan-10 2:54

AlexB47

15-Jan-10 2:54

HI All,
I need to write a routine that read, at same time, 3 files and raise each string on 3 separate event handler.
I think that the correct way to solve this problem is multithread. It's correct?
Can you help me with an example?

Thanks a lot.

Alex

Re: MultiThread and File process

Ilia Blank15-Jan-10 3:50

Ilia Blank

15-Jan-10 3:50

Can you provide more details?

Re: MultiThread and File process

AlexB4715-Jan-10 4:04

AlexB47

15-Jan-10 4:04

I need to read, at same time, 3 files that contain info to horse race. This 3 files contain the info for position istant by istant any horse (time info, x and y for draw point on virtual circuit). The start is equal for ALL, and I need to draw the position of any horse at same time ... and know how arrival first, second and three after passing the virtual "end line" ...

Alex

Re: MultiThread and File process

Ilia Blank15-Jan-10 4:12

Ilia Blank

15-Jan-10 4:12

How the drawing is initiated?
For example:
I have to update my animation when one of the files is updated on the disk.
Or
I have to update my animation with specific time intervals.

Re: MultiThread and File process

AlexB4715-Jan-10 4:19

AlexB47

15-Jan-10 4:19

in 2 mode:

- In real time from event receive from 3 comPort
- in post processing by read all files saved on hard disk (read time field saved internal)

Alex

Re: MultiThread and File process

Ilia Blank15-Jan-10 4:29

Ilia Blank

15-Jan-10 4:29

Correct me if I am wrong, in both cases the files will contain full history of the race for given horse.
For example:
0 milliseconds 0 meters
2 milliseconds 0.3 meters
8 milliseconds 0.8 meters
12 milliseconds 1.1 meters
…
88354 milliseconds 2000 meters //Finish

Re: MultiThread and File process

AlexB4715-Jan-10 4:45

AlexB47

15-Jan-10 4:45

Yes, in theory ... but I don't know what problem can generate a COM PORT EVENT ...

Alex

Re: MultiThread and File process

Ilia Blank15-Jan-10 5:33

Ilia Blank

15-Jan-10 5:33

Assuming that you have three files with full history of the race for each horse from start to finish and you are requested to create animation that simulates the race while preserving proper timing of the race. That what I would do

1. Load each file into corresponding list. Each list element represents position of the horse and timing of this position. Each list is sorted by time.
2. Merge three arrays into one list. Each list element represent time and position of all three horses at this time. The list is sorted by time.
3. Develop UI control that is capable of painting one race frame based on individual element from array created on step 2. Development of such control might be challenging but in general you have to assure that method called to draw particular frame “HorseRaceArenaControl::DrawRaceFrame (horse1Position, horse2Position, horse3Position ) “ can be called from arbitrary thread. The topics that you have to explore are Control::Invoke, Control::OnPaint, “implementing own-drown control”,
4. To call DrawRaceFrame method for each element in the list created in step 2. The method has to be called with time intervals as recorded in each element. You can use .Net System.Threading.Timer class to assure proper timing.
I realize that this is not detailed instruction but rather general guidelines. Hopefully it can serve as starting point.

Re: MultiThread and File process

AlexB4717-Jan-10 20:42

AlexB47

17-Jan-10 20:42

Thanks, this is good solution for post-processing files ... but in real time?

Alex

Re: MultiThread and File process

Ilia Blank18-Jan-10 4:53

Ilia Blank

18-Jan-10 4:53

Sorry, I failed to understand last statement.
You indicated that you use com3 event to drive “real time” animation. Can you provide more details?

Re: MultiThread and File process

AlexB4718-Jan-10 4:58

AlexB47

18-Jan-10 4:58

example ... 3 GPS-GSM that trasfer horse position in real time. I connect a modem receiver to my PC, open a COM PORT for it, ad using, in real time, a sentences that I receive. For any horse.

Alex

Re: MultiThread and File process

Ilia Blank18-Jan-10 5:04

Ilia Blank

18-Jan-10 5:04

Sounds as horse position is embedded inside com3 message. Am I right?

Re: MultiThread and File process

wjp_auhtm15-Jan-10 3:54

wjp_auhtm

15-Jan-10 3:54

Hi:

I just write a simple example for you. I hope it was useful for you.

<br />
    /// <summary><br />
    /// example of MultiThread<br />
    /// </summary><br />
    class MultiThread<br />
    {<br />
        Thread td_example = null;<br />
        System.Windows.Forms.Control _ctl;<br />
        public MultiThread(System.Windows.Forms.Control ctl)<br />
        {<br />
            td_example = new Thread(new ThreadStart(CalledMethod));<br />
            _ctl = ctl;<br />
        }<br />
<br />
        /// <summary><br />
        /// start the thread<br />
        /// </summary><br />
        public void startThread()<br />
        {<br />
            td_example.Start();<br />
        }<br />
<br />
        /// <summary><br />
        /// pause the thread<br />
        /// </summary><br />
        public void suspendThread()<br />
        {<br />
            td_example.Suspend();<br />
        }<br />
<br />
        /// <summary><br />
        /// stop the thread<br />
        /// Don't forget release the thread by this method<br />
        /// sometimes, the thread willn't exit and still run after the form closed<br />
        /// so, I suggest that to call this method before you want to close the main form.<br />
        /// </summary><br />
        public void abortThread()<br />
        {<br />
            td_example.Abort();<br />
        }<br />
<br />
        int i = 0;<br />
        private void CalledMethod()<br />
        {<br />
            //<br />
            // TODO:write your code here.<br />
            //<br />
            while (true)<br />
            {<br />
                i++;<br />
                System.Windows.Forms.MessageBox.Show(i.ToString());<br />
<br />
                Thread.Sleep(1000);<br />
            }<br />
        }<br />
    }<br />

good luck!

Re: MultiThread and File process

AlexB4715-Jan-10 4:06

AlexB47

15-Jan-10 4:06

the class is 1 for all the 3 istance?

Alex

Re: MultiThread and File process

wjp_auhtm16-Jan-10 2:29

wjp_auhtm

16-Jan-10 2:29

You can instantiate the class to a variable. Then use the variable which instantiated to open each files.

I just write a simple example for you. And, this is only a guiding idea. I consider that the more problems solved by oneself the more he/she learned.

There was an old sentence, in our country, said that,"Teaching someone fishing than giving he/she fishes."

I suggest that trying each one's answer and google it,I think you will learn more by yourself.

I am sorry for my poor English.

Good Luck!

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.