Re: How can I create own Browser? - C# Discussion Boards

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Re: how to use event to re-write this code segment?

George_George3-Jun-08 1:36

George_George

3-Jun-08 1:36

Thanks PIEBALDconsult,

I have got your idea. Compared with my original code using sleep in the very first post, does your code have better performance (e.g. less impact to the whole application performance)?

regards,
George

Re: how to use event to re-write this code segment?

PIEBALDconsult3-Jun-08 17:59

PIEBALDconsult

3-Jun-08 17:59

George_George wrote:
better performance

Doubt it's any better or worse, but I find it easier to read and maintain. Which is why I use Timers for my Services.

Re: how to use event to re-write this code segment?

George_George3-Jun-08 18:27

George_George

3-Jun-08 18:27

Thanks PIEBALDconsult,

1.

We have discussed solutions using only Timer, using only Sleep. Is it possible to have solutions using only Event? (I showed a solution using Timer together with Event, which I think is not good.)

2.

The most concern why I can not find a solution using Event only is, there is no way to check whether a signal is set or not after Wait (with timeout), right?

regards,
George

Re: how to use event to re-write this code segment?

PIEBALDconsult3-Jun-08 18:49

PIEBALDconsult

3-Jun-08 18:49

1) Not to my knowledge.

2) Those events (which I don't use and hadn't heard of until you mentioned them) require a thread of some sort.

Unless this is homework and you have to use those events, just do what you know works.

Re: how to use event to re-write this code segment?

George_George3-Jun-08 19:00

George_George

3-Jun-08 19:00

Thanks PIEBALDconsult,

This is not homework. Just my interest to find alternative solutions. Smile | :)

Here is my question showed by the code, it seems there is no way to check whether the signal is set or not after WaitOne(1000) returns, right? So, we can not just use a singal to check the stop condition for a thread, and we need some other approaches to check?

(my previous ideas is to check whether the signal is set or not, if it is set after WaitOne(1000), then I can stop the thread, but after MSDN document study, seems no way to check whether a signal is set or not after WaitOne(1000)?)

static void ThreadMethod3()
{
    while (true)
    {
        CheckEvent.WaitOne (1000);
        // we can not know whether the event is set or not here?
        Console.WriteLine(DateTime.Now);
         // do some work
    }
}

regards,
George

Re: how to use event to re-write this code segment?

PIEBALDconsult3-Jun-08 19:03

PIEBALDconsult

3-Jun-08 19:03

I don't know, I don't use those, I don't foresee a need for them.

How can I create own Browser?

lockepeak1-Jun-08 14:08

lockepeak

1-Jun-08 14:08

I want to create my own browser,it is like Oicq or icq ,this is his clinet can reration his server.How can I do?help me,thank you!

Re: How can I create own Browser?

Christian Graus1-Jun-08 15:54

Christian Graus

1-Jun-08 15:54

lockepeak wrote:
it is like Oicq or icq

These are not browsers, they are chat programs. You do it by writing client code, and server code. There is an example here on CP. Odds are you need to buy a book, and choose some more basic projects first.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Reading Registry Key Problem.

Jammer1-Jun-08 13:56

Jammer

1-Jun-08 13:56

Hi All,

I've been reading up on this and all the examples I can find show the exact method I'm using to read a value yet my value is never retrived. I'm checking the version of WMP installed on the system using:

Microsoft.Win32.RegistryKey wmpRegKey = Microsoft.Win32.Registry.LocalMachine.CreateSubKey(@"SOFTWARE\Microsoft\Active Setup\Installed Components\{22d6f312-b0f6-11d0-94ab-0080c74c7e95}");
string wmpVersion = (string)wmpRegKey.GetValue("Version");

as soon as the last line is executed the wmpVersion won't even pop up a debugger widget and wmpRegKey won't either.

Any Ideas?

Jammer

Going where everyone here has gone before! Smile | :)

My Blog

Re: Reading Registry Key Problem.

Sujith C Jose2-Jun-08 2:58

Sujith C Jose

2-Jun-08 2:58

using Microsoft.Win32;

//Statements (In your case)
//------------------------------

RegistryKey Reg;

//open the registry key
Reg = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Active Setup\Installed Components\{22d6f312-b0f6-11d0-94ab-0080c74c7e95}");

//get the requested values
if(Reg!=null)
{
string str1 = Reg.GetValue("Version").ToString();
MessageBox.Show(str1);
}

//close the key
Reg.Close();

//Regards Smile | :)

Sujith
Blog 123

Can I find out how many dataset are in a project?

belzer1-Jun-08 11:20

belzer

1-Jun-08 11:20

Hello

Is there a way to find out if any dataset is attached to a project

i.e. MyPoject.Dataset.count

Thanks

Re: Can I find out how many dataset are in a project?

Christian Graus1-Jun-08 15:54

Christian Graus

1-Jun-08 15:54

You'd need to keep that count for yourself.

Re: Can I find out how many dataset are in a project?

belzer2-Jun-08 4:21

belzer

2-Jun-08 4:21

Thanks for your reply,

i need to write a foreach loop for datasets, how can i write it?

foreach dataset in what?

Thanks again

Can we declare method with optional parameters ?

Mohammad Dayyan1-Jun-08 9:43

Mohammad Dayyan

1-Jun-08 9:43

Hi there.

I want declare method with optional parameters.
For example I want declare this method :

private void tree (string optional_parameter)
{
...
}

that I could call it like this :

tree();

Id est , I can omit optional_parameter.
Can we do it in C# ?

Sorry for my English. I'm a freshman .

Re: Can we declare method with optional parameters ?

Giorgi Dalakishvili1-Jun-08 9:53

Giorgi Dalakishvili

1-Jun-08 9:53

Here you go: Handling optional parameters in C#[^]

Giorgi Dalakishvili

#region signature
my articles
#endregion

Re: Can we declare method with optional parameters ?

Scott Dorman1-Jun-08 17:05

Scott Dorman

1-Jun-08 17:05

C# doesn't support optional parameters. You achieve this concept by using method overloading.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

[Forum Guidelines] [Articles] [Blog]

Re: Can we declare method with optional parameters ?

Jaime Olivares1-Jun-08 19:21

Jaime Olivares

1-Jun-08 19:21

Just do as:

private void tree(params string[] optional_parameter)
{
    if (optional_parameter.Length > 1)
       throw new Exception("tree(): Invalid parameter count");
    else if (optional_parameter.Length == 1)
    {
           // do something with optional_parameter[0]
    }
    // regular code
}

Best regards,
Jaime.

Re: Can we declare method with optional parameters ?

Mohammad Dayyan1-Jun-08 22:26

Mohammad Dayyan

1-Jun-08 22:26

Thanks , your answer was helpful .

Sorry for my English. I'm a freshman .

How to prevent to changing row in DataGridView when user is edit Mode ?

hdv2121-Jun-08 7:46

hdv212

1-Jun-08 7:46

hi i have a dataGridView and some textBox for each field, i want when i user double click on dataGridView, my controls bind to datasource that my dataGridView bound to, hitherto, it worked correctly and all row information display in appropirate textBox, this is edit mode, i want in this state, user can't change row until click ok or cancel info, but how to prevent row changing in datagridView ?
thanks

ftp treeview

jammmie9991-Jun-08 1:27

jammmie999

1-Jun-08 1:27

How do i dispaly the files and folders of a site in a tree view or simular format to windows explorer

Thanks

Re: ftp treeview

Christian Graus1-Jun-08 4:00

Christian Graus

1-Jun-08 4:00

With a tree view control.

Check Box in grid view

venkat86_ece31-May-08 23:54

venkat86_ece

31-May-08 23:54

Hi,

In grid view Control,How can i represent a check box which is embed in the grid view.

Re: Check Box in grid view

Christian Graus1-Jun-08 4:01

Christian Graus

1-Jun-08 4:01

I am close to certain there's a code project article on how to do this.

CP Ignore

leckey1-Jun-08 10:14

leckey

1-Jun-08 10:14

Cross-post

Shhhhh.....
http://craptasticnation.blogspot.com/[^]

Windows service status checking

George_George31-May-08 22:09

George_George

31-May-08 22:09

Hello everyone,

I am using the following code segment to check the status of a specific Windows service. My question is, if the service name does not exists, when we tries to get the Status property of the Windows service, there is InvalidOperationException. What is the elegant way to solve this issue (I have not found an API to check whether a service exists, and if I can check whether a service exists, I can check the Status property only for the service which exists)?

    ServiceController controller = new ServiceController("not existing service");
    try
    {
        if (controller.Status == ServiceControllerStatus.Running)
        {
            // do something
        }
    }
    catch (InvalidOperationException ex)
    {
        // come here when service name does not exist
    }
}

thanks in advance,
George

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