C# Discussion Boards - CodeProject

David Stone12-Nov-02 4:42

12-Nov-02 4:42

I dunno. But Jeffery Richter says not to. So you know what I don't do? Use the String constructor. In Applied Microsoft .NET Framework Programming, page 253, he says:

"In C#, you can't use the new operator to construct a String object..."

Go figure... Unsure | :~

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-Chris Maunder

Re: Password Encryption

Derek Lakin12-Nov-02 19:56

Derek Lakin

12-Nov-02 19:56

David Stone wrote:
"In C#, you can't use the new operator to construct a String object..."

The code I gave does work as it should do so, can't is a bit misleading; shouldn't may have some merits, though.

David Stone wrote:
Jeffery Richter says not to

If Jeffrey says so, then I will cease this instant. I keep meaning to get the book or something similar, but haven't quite got round to it yet. I'm too busy blundering about unguided Big Grin | :-D

Derek Lakin.
I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

Re: Password Encryption

Pete Bassett11-Nov-02 4:59

Pete Bassett

11-Nov-02 4:59

AHHH. Damn and blast. David beat me to it.

Yeah, hes right. Yours isn't the best way of doing it.

public string test2(string strBoxPassword)
{
	// Copy the char array into a byte array for encryption
	byte[] bPassword = System.Text.Encoding.Default.GetBytes(strBoxPassword);

	// Hash the password
	System.Security.Cryptography.SHA1 shaM = new System.Security.Cryptography.SHA1Managed();

	byte[] hash = shaM.ComputeHash(bPassword);

	return System.Text.Encoding.Default.GetString(hash);
}

Note that this and Davids reply are pretty similar except he excplicitly speficies the Unicode encoder. However, please note that both these methods WILL NOT return the same hash as your old method. The reason beeing is that you hard code 50 characters in the source byte array no matter what the actual length is. Our methods only hash the actual contents of the data and no extra trailing bytes.

Therefore if you already have hashes in your DB based on the originial code your probably going to have to either stick with what you have or re generate all the hashes...

Pete

Insert Sig. Here!

Re: Password Encryption

David Stone11-Nov-02 4:58

David Stone

11-Nov-02 4:58

Pete Bassett wrote:
AHHH. Damn and blast. David beat me to it.

Poke tongue | ;-P

It helps if you were working on the same bit of code for a personal project just about a week ago. Big Grin | :-D

Pete Bassett wrote:
Note that this and Davids reply are pretty similar except he excplicitly speficies the Unicode encoder

Death to ASCII! Long Live Unicode! Actually, your method might take Unicode...I'm not sure...
[edit]Actually, your method gets the System's current encoding. So if your OS was based on Unicode(XP I think) then it'll get a Unicode encoder.[/edit]

Re: Password Encryption

leppie11-Nov-02 6:15

leppie

11-Nov-02 6:15

David Stone wrote:
So if your OS was based on Unicode(XP I think) then it'll get a Unicode encoder

Wrong! Default encoder with actually return the current windows codepage. Dont ask me how, but I realised that working on my irc client. Very strange indeed. Best is just to use the same Encoder/Decoder, and not rely on different (but perhaps similar) ones.

Smile | :)

"I dont have a life, I have a program."

Re: Password Encryption

David Stone11-Nov-02 9:23

David Stone

11-Nov-02 9:23

Hope you don't mind my asking...but what the heck is a codepage? Confused | :confused:

Re: Password Encryption

leppie11-Nov-02 9:58

leppie

11-Nov-02 9:58

David Stone wrote:
but what the heck is a codepage?

Not really sure either, but I think it is an extension to ASCII based on your system culture. Something along that path.... Smile | :)

"I dont have a life, I have a program."

Re: Password Encryption

David Stone11-Nov-02 10:47

David Stone

11-Nov-02 10:47

Found it!
http://www.microsoft.com/typography/unicode/cscp.htm[^]

In Windows 95 and NT, a codepage is a list of selected character codes in a certain order. Codepages are usually defined to support specific languages or groups of languages which share common writing systems. For example, codepage 1253 provides character codes required in the Greek writing system.

The order of the character codes in a codepage allows the system to provide the appropriate character code to an application when a user presses a key on the keyboard. When a new codepage is loaded, different character codes are provided to the application.

Re: Password Encryption

Derek Lakin11-Nov-02 19:52

Derek Lakin

11-Nov-02 19:52

Thanks very much Big Grin | :-D

I knew there had to be a better way!

Derek Lakin.
I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

Some inherited form questions....

LongRange.Shooter11-Nov-02 3:44

LongRange.Shooter

11-Nov-02 3:44

I have my inherited form created and I have the controls set to be modifiable, setting them from Private to Protected. I also added the Main() logic so that all inherited forms can be selected as a starting form.

1) The documentation says I can compile to either a DLL or an EXE, I create a DLL and create reference to that DLL, yet when I create a new inherited form, it complains that the EXE does not exist. Do I have to create BOTH an EXE and DLL????

2) All of the stuff I've read indicates that I can create code in my base form and that code will be inherited in each instance. However when I create a new inherited form, it does not copy my [STAThread] code! I have yet to try creating control code, but I expect that that code would not copy either.

Any help on smoothing out these last two bumps is appreciated!!!

Thanks.

_____________________________________________
_{I have a tendancy to where my mind on my sleeve
I have a habit of losing my shirt...}

idc_arrow and C#

Senkwe Chanda11-Nov-02 2:20

Senkwe Chanda

11-Nov-02 2:20

Anybody know how to go about getting a handle to the default windows cursor?

Cursors.Arrow.Handle returns what seems to be a valid handle, but I get an error when I call

InPtr Hicon = Cursors.Arrow.Handle;<br />
<br />
Bitmap tempBitmap = Bitmap.FromHicon(Hicon);

The error is "invalid parameter used"

\\winnt\cursors doesn't seem to contain the actual default arrow cursor as a ".cur" file. It's defined in winuser.h via MAKEINTRESOURCE(...) with the identifier IDC_ARROW.

I wouldn't mind going the unmanaged route. (I'm doing this in fact, but using a cursor in the \\winnt\cursors directory). But that's just a temp solution as I really want the default cursor. How would I define Win32's LoadImage(...) or indeed the LoadCursor(...) function with regards to the MAKEINTRESOURCE(...) call?

Gosh, what an ugly question eh?

Smile | :)

ASP.NET can never fail as working with it is like fitting bras to supermodels - it's one pleasure after the next - David Wulff

Re: idc_arrow and C#

Stephane Rodriguez.11-Nov-02 3:01

Stephane Rodriguez.

11-Nov-02 3:01

Senkwe Chanda wrote:
InPtr Hicon = Cursors.Arrow.Handle;

This IntPtr is actually a WIN32 HCURSOR, not a WIN32 HICON, hence the error.

Back to real work : D-19.

Re: idc_arrow and C#

Senkwe Chanda11-Nov-02 4:12

Senkwe Chanda

11-Nov-02 4:12

Thanks .S.Rod. I'm used to using them interchangably via win32. Do you have any ideas on how I can get access to the handle for the default windows cursor? IDC_ARROW?

ASP.NET can never fail as working with it is like fitting bras to supermodels - it's one pleasure after the next - David Wulff

Re: idc_arrow and C#

Stephane Rodriguez.11-Nov-02 4:13

Stephane Rodriguez.

11-Nov-02 4:13

Senkwe Chanda wrote:
Do you have any ideas on how I can get access to the handle for the default windows cursor?

Doing Cursors.Arrow.Handle is the right code (internally it does a simple ::LoadCursor(IDC_CURSOR);

But, as I have already said, this call returns a HCURSOR.

What you were trying to do next is build a bitmap. That's a fine idea, but the API method you use expects an HICON, not an HCURSOR.

So you've got to find somewhere (either in the .NET API, or through WIN32) a way to convert the HCURSOR to an HICON. I guess that if that was only a matter of casting, this would not lead to an error.

What about lurking around Codeproject articles dealing with HCURSOR and HICON ?

Back to real work : D-19.

Re: idc_arrow and C#

Senkwe Chanda11-Nov-02 18:39

Senkwe Chanda

11-Nov-02 18:39

Believe me .S.Rod, I've tried and come up blank Smile | :)

The easiest way (or the only way I can find) is to do it via Win32. That's ok except that I have no clue as to how to define the IDC_ARROW identifier in my .NET code. I couldn't find any articles on the topic. But thanks anyway. Perhaps I'll try and be content with my little hack Smile | :)

Cheers

Senkwe

ASP.NET can never fail as working with it is like fitting bras to supermodels - it's one pleasure after the next - David Wulff

Re: idc_arrow and C#

Anonymous11-Nov-02 18:56

Anonymous

11-Nov-02 18:56

Senkwe Chanda wrote:
That's ok except that I have no clue as to how to define the IDC_ARROW identifier in my .NET code.

public const int IDC_ARROW = 32512; // from winuser.h

Re: idc_arrow and C#

Senkwe Chanda11-Nov-02 19:47

Senkwe Chanda

11-Nov-02 19:47

Hi there, thanks, I'm aware of that Smile | :)

It's using it that's a problem right now.

Cheers

Senkwe

ASP.NET can never fail as working with it is like fitting bras to supermodels - it's one pleasure after the next - David Wulff

DataGrid ???

Christian Graus11-Nov-02 0:05

Christian Graus

11-Nov-02 0:05

I have been playing with ADO.NET and my connection object returns me a OleDbDataReader. How do I turn that into something I can bind to the DataGrid ?

Thanks for any suggestions.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

Re: DataGrid ???

James T. Johnson11-Nov-02 3:00

James T. Johnson

11-Nov-02 3:00

Use the DataAdapter's Fill method to fill a DataSet then set the DataSource property of the grid to the DataSet you just filled.

~~[edit]Sorry its early, i'll get back with you on how to do it [/edit]~~

It pays if I look at the right class in the framework, use the OleDataAdapter class, passing in your OleDbCommand object; then use one of the Fill methods.

James

- out of order -

Re: DataGrid ???

leppie11-Nov-02 6:27

leppie

11-Nov-02 6:27

Hi
To add the James's response, the DBAdapter has a wonderfull Configure button Smile | :)

Takes care of almost everything, but you mite need to modify the statements or procudures to your liking.

DataSets are really good timesavers Smile | :)

, but there is a performance overhead (not that its really noticable on my PC anyways)

Cheers Smile | :)

"I dont have a life, I have a program."

.NET Training Institute

ReachAnshul10-Nov-02 19:30

ReachAnshul

10-Nov-02 19:30

Hi Guys,
I am looking for .NET training institute in bay area (Sunnywale,Santa clara or Fremont).
Please let me know if you know one.
Thanks
Anshul

Re: .NET Training Institute

Christian Graus10-Nov-02 19:43

Christian Graus

10-Nov-02 19:43

Several people at work have done .NET courses. My advice - buy Programming the .NET Framework, Inside C#, and the ADO.NET and ASP.NET books from Microsoft. You'll learn more and it will cost less.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

BindingsCollection

Alan Todtenkopf9-Nov-02 11:19

Alan Todtenkopf

9-Nov-02 11:19

I am unsuccessful in inheriting from this class. ControlBindingsCollection inherits from it and it has protected internal members implying it was designed to be inherited from. Yet, the compiler says there is no access to the constructor and the object browser does not show a constructor.

Alan

Re: BindingsCollection

James T. Johnson9-Nov-02 11:25

James T. Johnson

9-Nov-02 11:25

Shawn Wildermuth *just* answered your question, but I'll repost it here for those not on the DOTNET-WINFORMS[^] mailing list.

"The constructor is marked internal...that's how the ControlBindingsCollection inherits from it."

James

- out of order -

Downloading files with Webrequest

Anonymous9-Nov-02 7:40

Anonymous

9-Nov-02 7:40

How do I determine when to stop reading from the response stream on a webrequest? It seems that if I do
while (bytesread > 0)
bytesread = bufferedrdr.Read(buffer, 0, buffer.Length);

I'll get incomplete files. Looks like the stream returns 0 bytes read whenever the internet connection lags. Most of the example code does use a 0/-1 return code to determine when to stop reading.

The read method doesn't wait until there is new data in the stream does it? Confused as to how to determine when the end of the file is downloaded.

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