Re: FileStream isn't Binary - C# Discussion Boards

12-Jul-05 14:56

How do I write binary files, FileStream works with files in binary form, but doesn't read or write in binary. I want a way to actually write files in binary, 1's and 0's.

Thanks for input.

Sau Fan Lee12-Jul-05 15:10

Sau Fan Lee

12-Jul-05 15:10

The FileStream class is binary, and it uses bytes to achieve that.

I think what you are looking for is a bit-stream class. Remember, the smallest unit for files are bytes, not bits (ie. You cannot have a file with, say, 4 bits, or 0.5 bytes). Therefore, FileStream works on binary bytes. As far as I know, System.IO does not provide a bit-stream class, so you may have to create your own wrapper class over an existing byte-stream class.

> whoami
The system is unable to identify you when you don't even know your name!

Expert Coming12-Jul-05 15:16

12-Jul-05 15:16

Binary is a form of count with a base of 1. So:

0000 = 0
0001 = 1
0010 = 2
0011 = 3
0100 = 4
0101 = 5
0110 = 6
0111 = 7
1000 = 8
1001 = 9
1010 = 10
1011 = 11
1100 = 12
1101 = 13
1110 = 14
1111 = 15

I need a way to write files in that format, so that humans cannot read the data.

Dave Kreskowiak12-Jul-05 15:37

12-Jul-05 15:37

Binary is base 2, not 1.

You're looking for the BinaryReader and BinaryWriter classes, here[^].

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Expert Coming12-Jul-05 17:57

12-Jul-05 17:57

So to use the binary writer, do I need to convert my strings to binary first?

Sau Fan Lee12-Jul-05 18:22

Sau Fan Lee

12-Jul-05 18:22

No, you can check out MSDN documentation on BinaryWriter.Write(String).

However, this may still not achieve the results you want. A person can still open the binary file in Notepad and see that string.

> whoami
The system is unable to identify you when you don't even know your name!

Expert Coming12-Jul-05 18:50

12-Jul-05 18:50

No I don't care if they see they document, but in true binary a file is unreadable my the human eye, at least easily, they can convert it but that is beside the point. If anyone has every used QuickBasic/QBasic before they should know what I am talking about.

Anonymous12-Jul-05 19:04

Anonymous

12-Jul-05 19:04

If you are trying to do something similar to records in QuickBasic, then I suggest you use System.Runtime.Serialization.Formatters.Binary.BinaryFormatter to achieve your purpose. This is actually the fastest way ion terms of performance, but it is the easiest.

If performance is important to you, then have a look at this article.

Dave Kreskowiak13-Jul-05 1:34

13-Jul-05 1:34

ExpertComing wrote:
but in true binary a file is unreadable my the human eye,

Only numbers qualify for this statement. String data is still readable.

And yes, I used QBasic in the past...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

p daddy13-Jul-05 2:15

p daddy

13-Jul-05 2:15

QBasic and QuickBasic. Happy days!

Big Grin | :-D

Dave Kreskowiak13-Jul-05 2:27

13-Jul-05 2:27

Like I said, it's "in the past." I'm not proud of it! :->

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

DavidNohejl13-Jul-05 2:38

DavidNohejl

13-Jul-05 2:38

Dave Kreskowiak wrote:

ExpertComing wrote:
but in true binary a file is unreadable my the human eye,

Only numbers qualify for this statement. String data is still readable.

It would be fun to write real "binary" writer - it would produce stream of characters '0' and '1' Big Grin | :-D

Totally unreadable, just as ExpertComing wants! yeah, and totally useless, too.

David

Bert [Otherside82] Derijckere

Bert [Otherside82] Derijckere13-Jul-05 2:46

13-Jul-05 2:46

But imagine the compression ratios you could get on a file with only 2 different bytes in it Laugh | :laugh:

Re: Problems closing forms

DavidNohejl13-Jul-05 3:01

DavidNohejl

13-Jul-05 3:01

haha

David

Problems closing forms

bootn12-Jul-05 14:47

bootn

12-Jul-05 14:47

HI all,

I am pretty new to the whole C# and Visual Studio scene and I am having a problem with closing my forms. I have a main form open, then after clicking a button (ie search) I pop-up another window. When I have finished with the window the user must close it, but everytime you click it it will close both the window and the main form instead of just the window.

I have tried:
- this.Close();
- this.Close(frmSearch);
- Form.ActiveForm.Close();

But to no avail.

Any help would be great!

Cheers Guys

Carnal (Car-Lan) Car and Computer Club http://carnalonline.org.

seee sharp12-Jul-05 17:17

seee sharp

12-Jul-05 17:17

I preassume that you create instance of form when you click button(search).

FormSearch search = new FormSearch();
search.show();

to close this you can use

search.Close();
This will close only search form.

And if the close button is on search form itself, you should be able to use this.Close();

Smile | :)

- ashish

Re: Problems closing forms

bootn13-Jul-05 15:19

bootn

13-Jul-05 15:19

Thanks for the reply but that doesnt seem to work. It closes the form but still closes the whole system.... I am totally out of ideas! If anyone can help that would be great!

Re: Problems closing forms

grim_zax14-Jul-05 13:12

grim_zax

14-Jul-05 13:12

try looking at the close() events... maybe there is a close there somewhere ... and also try looking for Application.Exit method ... maybe you place something like this in your app

its me =Þ
grim zax

Visual Studio 2003 with C# 2.0

dave_ing12-Jul-05 14:39

dave_ing

12-Jul-05 14:39

Is there a way to upgrade Visual Studio 2003 to the new language specifications for C# 2.0?

Dave

Re: Visual Studio 2003 with C# 2.0

Dave Kreskowiak12-Jul-05 15:33