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Arun Bhalla wrote:
Note also that the version of the assembly must be identical on both ends.
Do you mean that the version of .NET that the assembly is using on both sides must be identical? Or do you mean that the version of the assemblies itself must be identical? If the latter this makes no sense because the assembly using BinaryWriter might be different from the assembly using the BinaryReader, e.g., there is a client/server relationship.
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Ooops, sorry I was thinking of BinaryFormatter & Serialization.
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what do you think from the following books you most recommend for C# newbie?
Programming C# 3rd Edition by O'REILLY
C# and The .NET Platform, Second Edition
Wrox: Professional C# 2nd Edition
Sybex, Mastering Visual C#.net
MS press c#.net core reference
thnks, i just want to hear your opinion before buying!
nevhile.net
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None of 'em. Go buy Inside C# 2nd edition by Tom Archer. That's the best book for learning C#...ever. 
Hawaian shirts and shorts work too in Summer.
People assume you're either a complete nut (in which case not a worthy target) or so damn good you don't need to worry about camouflage...
-Anna-Jayne Metcalfe on Paintballing
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David Stone wrote:
That's the best book for learning C#...ever
Agreed!
James
"then when you go to bed...wait, you dont do that do you....ok....when you plug into the 'hive mind' to charge yourself, ill hack into your head"
Nnamdi Onyeyiri over MSN
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I like "C# Essentials" by O'Reilly press, "Developing Applications with Visual Studio .NET" by Grimes, and Gunnerson's C# book to some extent.
For Windows Forms I like ".NET Windows Forms in a Nutshell" from O'Reilly, and Petzold's "Programming Windows with C#". Windows Forms is so vast that while both of these books are big, neither comes close to covering the whole thing.
I did not like Archer's book at all.
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A s h wrote:
I did not like Archer's book at all.
 Blasphemy!!! 
Just kidding  , different people have different styles of learning. Tom's style of teaching may not be the best for everybody. I recommend going to your local Borders or Barnes & Noble and skimming the book to see if it's right for you.
Hawaian shirts and shorts work too in Summer.
People assume you're either a complete nut (in which case not a worthy target) or so damn good you don't need to worry about camouflage...
-Anna-Jayne Metcalfe on Paintballing
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whatever you do, avoid Windows Forms Programming with C# by Erik Brown
Its one of those books where every example builds on the previous example's code. Horrible, horrible idea. It's like the opposite of the perl cookbook.
"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx
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Hi all!
I am trying to encrypt data with C# and decrypt the same data using VC++ 6, both using a password. I believe that I am very close on this one but am currently stuck and am receiving error 2148073477 on the VC++ CryptDecrypt() call. My keys generated by C# and VC++ are the same, so that seems to be okay.
My C# code is as follows:
// C# Begin *********************************
string s = "Hello";
RC2CryptoServiceProvider sp;
MemoryStream ms;
byte[] toEncrypt;
byte[] fromEncrypt;
byte[] IV = new byte[8];
byte[] key;
sp = new RC2CryptoServiceProvider();
sp.Mode = CipherMode.CBC;
sp.KeySize = 40;
sp.EffectiveKeySize = 40;
ms = new MemoryStream();
// Create the key
PasswordDeriveBytes pdb = new PasswordDeriveBytes( "ABCD-1234-XXXX-0000", IV );
key = pdb.CryptDeriveKey( "RC2", "MD5", 40, IV );
sp.Key = key;
// Create the crypto stream
CryptoStream cs = new CryptoStream( ms, sp.CreateEncryptor(), CryptoStreamMode.Write );
// Encrypt the data
toEncrypt = Encoding.UTF8.GetBytes( s );
cs.Write( toEncrypt, 0, toEncrypt.Length );
cs.FlushFinalBlock();
ms.Position = 0;
fromEncrypt = new byte[ms.Length];
ms.Read( fromEncrypt, 0, (int)ms.Length );
// Cleanup
cs.Close();
ms.Close();
// C# End *********************************
My VC is as follows:
The VC code contains a byte array that I populate after running the C# code and stepping through.
It contains a call to CryptEncrypt() and CryptDecrypt() to prove that encryption is working with the generated key.
I also exported the key to ensure that it was identical to the C# key.
// VC Begin *********************************
HCRYPTPROV hCryptProv;
HCRYPTKEY hKey;
HCRYPTHASH hHash;
CHAR szPassword[] = "ABCD-1234-XXXX-0000";
CHAR szMessage[512] = "";
DWORD dwLength;
BOOL b;
BYTE* pbKeyBlob;
BYTE bTest[] = {0x1e, 0x03, 0x91, 0xbe, 0xef, 0x2b, 0xdf, 0x91};
strcpy( szMessage, "Hello" );
b = CryptAcquireContext( &hCryptProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, 0);
b = CryptCreateHash( hCryptProv, CALG_MD5, 0, 0, &hHash);
dwLength = strlen( szPassword );
b = CryptHashData( hHash, (BYTE*)szPassword, dwLength, 0);
b = CryptDeriveKey( hCryptProv, CALG_RC2, hHash, CRYPT_EXPORTABLE, &hKey);
dwLength = strlen( szMessage );
b = CryptEncrypt( hKey, 0, TRUE, 0, (BYTE*)szMessage, &dwLength, 512 );
b = CryptDecrypt( hKey, 0, TRUE, 0, (BYTE*)szMessage, &dwLength );
// The call that FAILS!
dwLength = 8;
b = CryptDecrypt( hKey, 0, TRUE, 0, bTest, &dwLength );
DWORD dw = GetLastError();
b = CryptExportKey( hKey, NULL, PLAINTEXTKEYBLOB, 0, NULL, &dwLength);
pbKeyBlob = (BYTE*)malloc(dwLength);
b = CryptExportKey( hKey, NULL, PLAINTEXTKEYBLOB, 0, pbKeyBlob, &dwLength);
free( pbKeyBlob );
b = CryptDestroyHash( hHash );
b = CryptDestroyKey( hKey );
b = CryptReleaseContext( hCryptProv, 0 );
// VC End *********************************
Is there something I'm missing?
Thanks
Cory Baker
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I have an application that uses a simple Webservice on my locaolhost, I have moved the webservice to the production
server and I have re-reference my application to the new server
location. I may need to move this webservice soon and would like to know if I can code the application so I can change
the server my webservice is located without having to rebuild the application.
Thanks for your help
=================================
When I was in school, all I wanted was to get out into the real world.
Now that I'm in the real world, all I want is to go back to school.
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Hi there,
I had some questions. I was learning c# and i saw this code:
static int amountopen = (0 - 500);
Hmm.. wonder, does it means we are setting a scope from 0 to 500 for integer amountopen?
This is first time i seen.
Oh ya, another added question. How does virtual keyword comes in handy in c# programming? Any good samples and explanations on that please.
Thanks.
Regards,
Chua Wen Ching :p
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chuawenching wrote:
static int amountopen = (0 - 500);
Hmm.. wonder, does it means we are setting a scope from 0 to 500 for integer amountopen?
Nope, it just means make amountopen = to the result of subtracting 500 from 0. 
chuawenching wrote:
How does virtual keyword comes in handy in c# programming? Any good samples and explanations on that please.
Here's a link that should help: http://www.jaggersoft.com/csharp_course/16_Inheritance_files/frame.htm[^] Click on "virtual Methods".
Regards,
Alvaro
Hey! It compiles! Ship it.
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Thanks for the reply.
amountopen = to the result of subtracting 500 from 0.
--> subtract 500 from 0 means amountopen = -500 ???
So why can't the coder code this:
amountopen = -500
rather than
amountopen = (0-500)
What is his purpose? Thanks for the virtual link?
Is that the best site to learn oop way in c#? Must the slides does not show a complete source code. I want to learn while coding? Thanks.
Regards,
Chua Wen Ching :p
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chuawenching wrote:
So why can't the coder code this:
amountopen = -500
rather than
amountopen = (0-500)
I don't know. If you can ask him/her, hopefully you can find out. There's no obvious answer, except perhaps the developer didn't know he/she could just write -500. 
chuawenching wrote:
Is that the best site to learn oop way in c#? Must the slides does not show a complete source code. I want to learn while coding?
It's the best one I could come up with on short notice. I'm sure there are others out there that do a better job. Here's one from MSDN which may serve you better: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vcoriCProgrammersReference.asp[^]. Depending on how much previous experience you have with other languages, a book on C# programming may also help.
Good luck!
Alvaro
Hey! It compiles! Ship it.
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Thanks
But i feel that msdn tutorials a bit complicated. So many links here and there. And at the end i learn nothing. 
Regards,
Chua Wen Ching :p
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Hi,
a little question:
What is the default type access modifier for a class/struct?
The MCAD Study Guide I'm reading says public while a tutorial from MS'site (Dr. GUI) says internal?!?!
Oh what to believe?  ;P;P
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Internal, AFAIK.
Regards,
Alvaro
Hey! It compiles! Ship it.
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Java heathen.
The default access is 'private', of course.
--
-Blake (com/bcdev/blake)
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Blake Coverett wrote:
Java heathen.
 Yep.
Blake Coverett wrote:
The default access is 'private', of course.
I think he was referring to the default accessibility for a class inside a namespace, not for the members of a class themselves. And according to this[^], it's internal.
Regards,
Alvaro
Hey! It compiles! Ship it.
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The question is a big vague, but upon rereading it I think you are right about what he was asking. And yes indeed, the default access of a class is protected. Touche'.
*grins broadly* On the other hand... there is no 'accessibility inside a namespace' at all in C#. That is an even more blantant Java-ism. Assemblies are a protection boundary, namespaces are have no impact on accessibility whatsoever.
--
-Blake (com/bcdev/blake)
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Yeah I was reffering to access modifiers as applied to a class or struct, for example:
public class<br />
{<br />
}
By surfing MS's site I've come to the conclusion that it's internal which is what I've always thought it was until I read the MCAD Study Guide from MS where it is clearly stated as being public!  . How can something like that slip by the technical editor?!?!
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Does anyone know how using the Drawing.Image.Bitmap class I can read a bitmap in CMYK format, modify it, and save it preserving the CMYK attributes. Currently it reads it in just fine but when writing it converts to RGB.
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Sorry, that's not going to happen with the Bitmap class, at least not in this revision. If you are working with CMYK data you probably need more control over your color matching then GDI+ currently provides as well.
--
-Blake (com/bcdev/blake)
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I need to send an email containing a link ( HTML href tag ).
Currently i can succesfully send mails using these namespaces
System.Web.Mail;
System.ServiceProcess;
The message is sent using the SmtpMail.Send( msg );
I tried including a string containing a href tag in the message body but it didnt work. I also tried including a complete html document in the message body. It didn't work either.
Anyone got an idea on how to do this ?
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