creating a circular array - C# Discussion Boards

Re: always selected Listview item

Mycroft Holmes29-Aug-09 15:24

Mycroft Holmes

29-Aug-09 15:24

Set the 'Hide Selection' property to false on the listview.

Never underestimate the power of human stupidity
RAH

hide & Show a Listview Column

Jassim Rahma29-Aug-09 9:38

Jassim Rahma

29-Aug-09 9:38

I want to know how can hide and again show a column in the listview control just like visible=true or =false?

Re: hide & Show a Listview Column

Abhishek Sur29-Aug-09 10:56

Abhishek Sur

29-Aug-09 10:56

AFAIK you need to remove the item when you want it invisible, and again you can add when needed.
Cool | :cool:

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
Don't forget to click "Good Answer" if you like to.

Re: hide & Show a Listview Column

Dave Kreskowiak29-Aug-09 11:52

Dave Kreskowiak

29-Aug-09 11:52

Like was mentioned, you have to remove the column from the ListView to hide it, then re-add it when you want it to be visible.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

find all available emails under a domain name

Jassim Rahma29-Aug-09 9:37

Jassim Rahma

29-Aug-09 9:37

is there any way to give a domain name then .NET will search for all created emails under that domain name?

Re: find all available emails under a domain name

Manas Bhardwaj29-Aug-09 10:31

Manas Bhardwaj

29-Aug-09 10:31

jrahma wrote:
is there any way to give a domain name then .NET will search for all created emails under that domain name?

Why would you need that?

I can not think of any other thing other than a SPAMMER needing this.

Manas Bhardwaj
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Re: find all available emails under a domain name

Dave Kreskowiak29-Aug-09 11:51

Dave Kreskowiak

29-Aug-09 11:51

First, the question is why would yo want this?

The second question is search in WHAT for these emails? Search an Outlook archive?, an SMTP server?, your own database?, ... what is storing these emails??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

creating a circular array

Steve1_rm29-Aug-09 8:30

Steve1_rm

29-Aug-09 8:30

Hello,

VS 2008

I am filling the buffer with the read method in the code below, using SlimDX to capture the audio input from the microphone.

The problem I have is that the buffer will overrun. It there anyway to create a circuler buffer that once it gets to the the end it will start over again?

Many thanks for any suggestions,

private void bgwAudioInput_DoWork(object sender, DoWorkEventArgs e)
        {
            Int16[] samples = new Int16[8192 / sizeof(Int16)];
            Int16 audioValue = 0;
            int i = 0;
            captureBuff.Start(true);
          
            while (captureAudio)
            {
                if (!this.bgwAudioInput.CancellationPending)
                {
                    captureBuff.Read(samples, 0, true);
                    audioValue = Math.Abs(samples[i++]);
                    this.bgwAudioInput.ReportProgress(audioValue);
                }
            }
}

Re: creating a circular array

Alan N29-Aug-09 9:06

Alan N

29-Aug-09 9:06

Hi,

Steve1_rm wrote:
The problem I have is that the buffer will overrun

Are you sure about that? It looks to me as if you are attempting to read beyond the end of the array.

Every iteration of the while loop reads data into the samples array. That's ok but eventually the indexer i has the value 4096 and the array access in the line audioValue = Math.Abs(samples[i++]); will fail.

I can't understand the meaning of audioValue and how it would relate to progress. Did you mean to report total amount of data read perhaps?

Alan.

Re: creating a circular array

harold aptroot29-Aug-09 9:13

harold aptroot

29-Aug-09 9:13

Steve1_rm wrote:
It there anyway to create a circuler buffer that once it gets to the the end it will start over again?

Sure, just index with i%length or i&(length-1) for powers of 2 (which you have here)

Take data from a website and display in a program.

malcomhfc29-Aug-09 7:14

malcomhfc

29-Aug-09 7:14

So i've slowly been learning c# over few months but going slow and is my first language.

One thing i would like to know, is how it would get a c# program to take data from a website then display inside the application. (Not taking data from a database)

Could anyone possible point be at examples or tell me roughly what i would have to do.

Thanks in advance,

Malcom

Re: Take data from a website and display in a program.

Luc Pattyn29-Aug-09 8:14

Luc Pattyn

29-Aug-09 8:14

Hi,

there are a couple of ways to do that:

1.
add a WebBrowser to your form, make it navigate to your URL, then grab its DocumentText.
You could do that with a hidden WebBrowser as well.

2.
use HttpRequest and HttpResponse classes to access the web yourself.
This is faster, but a bit more complex.

FWIW: make sure to study a good book[^] on C#

Smile | :)

Luc Pattyn

Badger | [badger,badger,badger,badger...]

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Take data from a website and display in a program.

malcomhfc29-Aug-09 8:42

malcomhfc

29-Aug-09 8:42

Yeah i have heard of HttpRequest and Response. I didn't want to use a browser.

So on return of the data it is possible to display it differently. For example come up in a textbox or different controls im not really thinking of just now.

Thanks for the book recommendation, i'm looking for the best one at Amazon Smile | :)

Re: Take data from a website and display in a program.

Luc Pattyn29-Aug-09 9:00

Luc Pattyn

29-Aug-09 9:00

the response is always a string, it is a text following HTML conventions.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Take data from a website and display in a program.

malcomhfc29-Aug-09 9:09

malcomhfc

29-Aug-09 9:09

Thanks for the help Smile | :)

Re: Take data from a website and display in a program.

Luc Pattyn29-Aug-09 9:10

Luc Pattyn

29-Aug-09 9:10

You're welcome.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Take data from a website and display in a program.

Gindi Bar Yahav30-Aug-09 11:45

Gindi Bar Yahav

30-Aug-09 11:45

You can use ADO.NET to create database for the website, and then connect to it with the C# application.

or you can do someting that call "web service" - open new ASP.NET Web service in your Visual Stduio, there, you can define methods that after you can call to then with your C#.

after you finish define, go to the C# project, and then on the solution explorer->referance of the project click left mouse, click "Web referance", and look for your web service address, then you can use all the methods you defined.

Gindi Bar Yahav - Web & Software developer.

How to show the characters of a text box in which its PasswordCharacter is set to '*'?

CoderForEver29-Aug-09 5:11

CoderForEver

29-Aug-09 5:11

Hey my friends ...... I have a password text box(i.e PasswordCharacter='*') there is one check box which allows the user to see its password or just the star ....... I tried to change the value of the text boxes passwordCharacter(i.e txtbox1.PasswordCharacter='') but it says "it is not allowed to make empty" ... so how can I do that??

Thank you

Re: How to show the characters of a text box in which its PasswordCharacter is set to '*'?

OriginalGriff29-Aug-09 5:38

OriginalGriff

29-Aug-09 5:38

matiIsGreat wrote:
I tried to change the value of the text boxes passwordCharacter(i.e txtbox1.PasswordCharacter='') but it says "it is not allowed to make empty"

No, you can't have an empty character literal - unlike a string which has a variable length 0..n and thus can be empty, a character has a fixed size (16 bits). Use '\0' for a null character and it will do what you want. Or, use "UseSystemPasswordChar" instead of "PasswordChar".

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

how to restrict users from setting focus to multiple cells in DataGridView ?

alladeen29-Aug-09 5:05

alladeen

29-Aug-09 5:05

I read an article on Msdn about how to restrict users from setting focus to a specific cell in DataGridView , and I understood how it work , but what really I need to now is how to restrict users form set focus to a multiple cells and especially if two cells are exactly adjacent
for example if I have 4 columns in a DataGridView and and the columns to skip are 2nd and 3rd , so how can i do that

Re: how to restrict users from setting focus to multiple cells in DataGridView ?

Henry Minute29-Aug-09 7:51

Henry Minute

29-Aug-09 7:51

Take a look at How to: Make Columns Read-Only[^] on MSDN.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

print a image and text without using printer driver. using C#.NET

shaktisinh29-Aug-09 3:57

shaktisinh

29-Aug-09 3:57

hi Developers..
I need to print a text and images without using printer driver.
using c#.net
i really need it done any how..
thanking you

Re: print a image and text without using printer driver. using C#.NET

Dave Kreskowiak29-Aug-09 5:47

Dave Kreskowiak

29-Aug-09 5:47

I hope you know exactly the commands you need to send to the printer to do what you want. You can bypass the printing system. There's an example in this KB article[^].

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: print a image and text without using printer driver. using C#.NET

shaktisinh30-Aug-09 23:54

shaktisinh

30-Aug-09 23:54

Dear Dave,
Thanks for your replay
I have already gone through the link you have given ..
actually I need to print image at the top, text and image at the bottom.
I dont know exact commands which i nee to send printer to print image and text
Thanking you,

Re: print a image and text without using printer driver. using C#.NET

Dave Kreskowiak31-Aug-09 1:01

Dave Kreskowiak

31-Aug-09 1:01

Those ARE the commands you use to send the data. You need the know WHAT you're sending to the printer. What do you have to send to the printer to tell it how to render the text and image you want. This is NOT going to be done for you and the commands will be different for every printer. This stuff will be documented in the manual for the printer. If you don't have it, contact the manufacturer of the printer to get one. Without it, you have no hope of doing what you want.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

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