|
I am trying to work my way into vb.net and classes. However right now I am locked into VB6 but can start using classes.
I can access "NewExam.Sections(3).Items(4).Name" using the followng code:
Type udtItem
ItemNum As Integer
Locked As Boolean
Name As String
End Type
Type udtSection
Items() As udtItem
End Type
Type udtExam
Sections() As udtSection
End Type
Dim NewExam As udtExam
Is there a easy way to do the same thing with classes without having to create 3 or more seperate classes.
|
|
|
|
|
After 10 or 20 minutes, my ASPX website loses the Global Variables defined in GLOBAL.asax The following is in Global.asax which has been designated as readonly file.
<script language="VB" runat="Server">
Public Class GlobalVarDefinitions
Public GlobalVars As Object
Public Company As String
End Class
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
Dim GlobalVars As New GlobalVarDefinitions
Session("Globals") = GlobalVars
Session("Globals").Company = "89"
Session("Globals").CompanyName = "Walong"
End Sub
</script>
In the individual aspx programs, the Global Variables are reference like this:
ICompany = Session("Globals").Company
In HTML as: <%=Session("Globals").CompanyName%>
How can I stop losing my Global Session Variables?????
|
|
|
|
|
Please check the session time out period. In your webconfig file look into SessionState property and look for timeout atribute. This attribute decides the timeout period for your session.
Mandar Patankar
Microsoft Certified professional
|
|
|
|
|
Thanks, Also, appparently the IIS Session Time-out overrides the webconfig file Time-out setting.
I found this on the website below:
<configuration>
<system.web>
<sessionState
mode="Inproc"
cookieless="true"
timeout="20" />
</sessionState>
</system.web>
</configuration>
This shows the values you need in the <sessionState code in the webconfig file. Reference: http://authors.aspalliance.com/aspxtreme/aspnet/syntax/sessionstatesection.aspx (cut and paste this URL in your Browser, this page explains all the appropriate values.)
By the way, my origianl code Session Variables work great, they are just timing out. So, if this is the solution, I have a solid, nicely working internal website.
|
|
|
|
|
I am doing an Excel VB, to make a Power Point Report, but now they ask me to create the report and create an HTML document to publish over the intranet, I've tryed the SaveAs function, but It didn't give me a HTML file, but it gave me the Power Point report.
following are the last rows of code:
:
:
:
Sheet1.Activate
ppApp.ActivePresentation.SaveAs Filename:="c:\ToPublish.htm", FileFormat:=ppSaveAsHTML, EmbedTrueTypeFonts:=msoFalse
ppApp.ActivePresentation.SaveAs Filename:= "c:\Followup.ppt"
' Clean up
ppApp.Quit
Set PPSlide = Nothing
Set PPPres = Nothing
Set ppApp = Nothing
'ppApp.Close
Sheet1.Activate
ActiveSheet.Range("d7").Select
Application.StatusBar = False
Application.ScreenUpdating = True
End Sub
Can anyone help me? 
Kind Regards.
|
|
|
|
|
I posted a question regarding how to (re)fill a dataset, but got no replies. Is there a tutorial on datasets and tableadapters that someone could refer me to?
thanks
|
|
|
|
|
I replied. Today. A little patience goes a long way. 
I may be able to help you.
|
|
|
|
|
hi..cstrader232 (how to spell your name?) 
It's not easy to make tutorial. if i got ones i will inform you..
But let take a look in your problem.. what are the problem regarding to fill or refill dataset and also with table adapter. ?
just let us know ur problem then we can respon it as soon as we understand and figure out the solution.
Beside, you have to try by yourself to experience more problem and that will make you sharper.
How about interactive tutorial..?
we'll discuss what kind of project will be develop in order to learn something within. and then we can develop it together in paralel?
:-Ois it sound good?
|
|
|
|
|
I could not find the category of crystal reports forum so I am posting here.
I want to declare global variable in formula editor and access that variable in another formula editor in the same report. How can I do that? Please help.
|
|
|
|
|
assuming that the opening bal is printed on the report header section & the
transaction in the detail section
if the opening balance is debit, then each balance should be calculated
as opbal+ddd-ccc and then the balance after first transaction
will get. then the next balance will be calculated as first
balance + debit - credit and the third balance should be
calculated as second balance + debit - credit.
you can create 2 formulas
1- init - pasted on the report footer besides opening bal
shared currencyvar runbal:= 0
runbal:=openbal;
runbal
2. baltot -pasted on the detail section
shared currencyvar runbal;
runbal:=runbal+debit - credit;
runbal
Thanks & Regards
Senthil
|
|
|
|
|
hi to all,
i m working on a project in which i got stucked in a problem when i m trying to connect with Sql server 2000.
I tried to connect it with sqldataadapter wizard & i get this error message
" The Specified module coulde not be found ".
can anybody tell me why this problem arises. Please reply soon. Thanx in Advance.
|
|
|
|
|
What connection string are you using?.
Mandar Patankar
Microsoft Certified professional
|
|
|
|
|
Hello all,
I am a complete NEWBIE to VB programming, I usually do everything through C++. However, I am using Word for part of a program and am adding command buttons. In the function, I am trying to simply save the document and exit Word.
Here is the code I have, but it doesn't seem to do anything.
Thanks in advance for the help....
Private Sub CommandButton1_Click()
ActiveDocument.Save
ActiveDocument.Close
Application.Quit
End Sub
|
|
|
|
|
All the objects you are creating should be closed. if you are missing any single reference to close then this code will not work. Second thing go to Articles in Code Project and search For Word you will found many solutions
-- modified at 3:58 Tuesday 25th July, 2006
|
|
|
|
|
Hi,
Would like to apply colors (BG Color, FG color & Font Color) of selected windows ColorScheme for windows controls.
currently using the following code
Imports Microsoft.Win32 <br />
<br />
Dim SchemeKey As RegistryKey<br />
<br />
SchemeKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey("Control Panel").OpenSubKey("Appearance").OpenSubKey("Schemes")
This will return the Scheme values…..e.g. Brick, Arizona etc….
I would like to get the color values for windows controls for the selected colorscheme.
Thanks,
RK
|
|
|
|
|
Hi,
I wish to display the application's help contents(.chm format) in Infragistics' Taskpane control using HelpProvider component.
Any help would be appreciated.
RK
|
|
|
|
|
Ask them. They sold it to you so they should solve your problems... and they can do this probably better than anyone here.
|
|
|
|
|
Hi,
I'm building an application to handle licensing some software i'm writing. I'm using the RijndaelManaged cryptography objects to encrypt an decrypt the license codes and database login info etc.
At present i have the Key and Initialisation vector values stored as byte arrays private to my cryptography class. The code works fine. The problem is that when i use a decompiler on my dll the Key value byte array is fully visible, along with my Encryption and Decryption methods, thus rendering the security useless.
My question is how do people actually store the Key value so that no one has access to it. I can't find any mention of how people actually do this, only how to use crytography once you have the key. I'm almost tempted to go back to vb6 to create my cryptography dll so i actually have some security. Does anyone else have this problem or am I missing something obvious?
Thanks
dave
|
|
|
|
|
Cryptography is mainly used to encrypt data while transmitted over an unsafe connection, e.g. the web. For this purpose, the key only have to be hidden from the web, not from users that have direct access to the computer.
blondie10 wrote: My question is how do people actually store the Key value so that no one has access to it.
You can't do that. If noone has access to the key, the program that is supposed to use the key doesn't have access either.
blondie10 wrote: I'm almost tempted to go back to vb6 to create my cryptography dll so i actually have some security.
Actually, you don't have any better security using VB6. You only think that you do, as you can't read the compiled code. Be assured that the people cracking codes do have tools/knowledge to do that.
---
b { font-weight: normal; }
|
|
|
|
|
My system is to do with licensing windows desktop based applications so other users will have direct access to the computer.
My system will have to receive and store a license code specifying which applications can be run and for how long. This obviously needs to be encrypted so the user can't change to full access forever.
Looking into public / private key pairs seems similarily problematic. The Private Key values can be stored in Key Containers but the user can get the name of the container and open it to get the key values.
If you are saying that there is no way to secure the Key value used to perform the encryption/decryption then how is any system secure.
Surely there is a way to solve this or we'd all be hacking everyone else's code rather than writing our own?
|
|
|
|
|
blondie10 wrote: Looking into public / private key pairs seems similarily problematic
Actually, it's not.
Why would you ship a private key to the public??? It would be ludicrous to do so, as you're helping the community to defeat your own key.
In the symetric system, you ship ONLY the public key with the data so the user (application actually) has the only key that can decrypt the license.
Your problem really isn't protecting the keys, it's protecting the license code. When you boil it all down, it comes to a single IF statement as to whether the app is going to run or not. Whoever wants to break your license code really won't care about the key! Their goal will usually be finding the correct path through the license code and doing a little bit of re-wiring to bypass it. This is usually much easier than trying to pry out the key.
blondie10 wrote: If you are saying that there is no way to secure the Key value used to perform the encryption/decryption then how is any system secure.
You're making the mother of all f-ups! You're assuming that any system IS secure. There's no such thing. There is ALWAYS someone who can bust your security wide open!
blondie10 wrote: Surely there is a way to solve this
Copy protection has been the pipe dream for, what, 30 years now?
blondie10 wrote: or we'd all be hacking everyone else's code rather than writing our own?
That depends on the skill level of the person in question and in what areas. Is it easier for any one person to crack the code or write a similar app from scratch?
Dave Kreskowiak
Microsoft MVP - Visual Basic
|
|
|
|
|
mmm, Dave K I think you're somewhat missing the point. Also Public / Private cryptography is asymmetric not symmetric, but who cares you're the mvp after all, though from a quick check on Microsoft's MVP web site your not listed, but hey we all need a buzz to get us through the day.
perhaps i'll rephrase the question to make it more understandable, apologies to anyone else reading this.
Firstly apologies also for the length of this, buy hey it's a big subject.
Now as i understand the public / private system, and please feel free to constructively correct me if i'm wrong (abuse and diatribes are rarely helpful), using the RSACryptoServiceProvider I have a private key with which i encrypt a license number. The user recieves the encrypted number and the local licensing application decodes the passed license value using the public key. The license app then does as required with the decrypted value. If I also use a Digital Signiture, or Hash of the message, i know that i encrypted the value originally and that it hasn't been edited by a third party so all is well.
I don't understand about sending data in reverse, does the remote system use the public key to encrypt the message and my system then uses the private key to decrypt it? If this is so does'nt this mean any user can send me a message as the public key is, well, public?
With regards to storing sensitive information such as Database login details, the encryption is done locally to the user. In this situation i guess i use a form of symmetric cryptography such as the RijndaelManaged cryptography objects i mentioned originally. This still leaves me with the same issue, that anyone with a simple decompiler can view the private key and the cryptography coding methods, as they're held locally to the user, so anyone can cut and paste them to a new project and decrypt the data.
This all seems to easy and that i must be missing something to do with symmetric cryptography, again no more replies on 'all code can be cracked with the right tools bla bla bla'. With the level of encrytion and ease of cracking shown on my own very basic and simple tests there seems to be no point on even performing encryption unless the user has no technological knowledge whatsoever.
A reply on another forum has suggested deriving the key from another source, but if my code can be viewed with a decompiler then surely the source and how the derivation is performed can also noted and duplicated.
The security in my system is not intended to hold up against serious hackers with days or weeks on their hands and the latest tools and techniques, but it should at least survive simple viewing with an online decompiler, symmetric cryptography seems to fail even at this level.
Now perhaps the only answer to the problem at this level of security would be to objfuscate the code. If this is so, do lots of people do this and what are good products to use?
thanks
dave
|
|
|
|
|
blondie10 wrote: Now perhaps the only answer to the problem at this level of security would be to objfuscate the code
It is Obfuscate, but who cares you're the friendliest person after all.
|
|
|
|
|
blondie10 wrote: but who cares you're the mvp after all, though from a quick check on Microsoft's MVP web site your not listed,
That's because I never wrote the thing and enabled it for public view.
blondie10 wrote: Also Public / Private cryptography is asymmetric not symmetric,
Sorry, I was thinking 'asymmetric' and typed 'symmetric'.
blondie10 wrote: I don't understand about sending data in reverse, does the remote system use the public key to encrypt the message and my system then uses the private key to decrypt it? If this is so does'nt this mean any user can send me a message as the public key is, well, public?
Yes, to both questions. The only difference between Public and Private keys is the arbitrary choice of which one you give out to the public.
blondie10 wrote: Now perhaps the only answer to the problem at this level of security would be to objfuscate the code.
Obfuscationis about the best choice you have that doesn't cost $,$$$.
Dave Kreskowiak
Microsoft MVP - Visual Basic
|
|
|
|
|
suppose i have one MDi form and two child form and there is two method called test1() and test2()
in form1 and form2 and there is two buttons in a toolbar attached with mdi for and when button 1
will be pressed then test1() method of active child will be fired.so how could i call a method of
active child form from mdi form.pls help me with sample code
tbhattacharjee
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
