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I hope I can articulate this so that you can understand the problem. I built to classes: Encrypt and Decrypt according to MSDN article. When I run the program to encrypt and decrypt strings with the test program, everything works fine. The process is:
plaintext = "this is to be encrypted"
ciphertext = encrypt(plaintext)
returntext = decrypt(ciphertext)
in this example plaintext and returntext are identical.
I am trying to store the results of the encrypt to a registry string. ciphertext is a byte[] on the return so I am converting it to string for storage in the registry by using:
mystring = Convert.ToBase64String(cipherText)
in this example, ciphertext has a length of 48. I store mystring to the registry and retrieve it. This works fine. When I convert the plaintext from the registry back into a byte[] using:
cipherText = Encoding.ASCII.GetBytes(mystring);
the length is now 64 for ciphertext and the decrypt function fails returning an error message about PCKS7 padding is invalid.
How can I store the ciphertext to the registry and reconvert it back to byte[] without physically changing the data? Hope this makes sense. Thanks.
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A good look at the documentation for the Convert and Encoding classes would be a good idea. You are mixing two incompatible methods, which just won't work. Convert.ToBase64String teams up with Convert.FromBase64String, and Encoding.GetBytes() teams up with Encoding.GetString(). Choose either pair and you should reach your goal.
John
"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.
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Thank you for responding, but I figured out exactly what you said after a few hours of pounding my head against the wall. Unfortunately, being new to c# is a head-ache and a half. It takes me 4 hours to do what I could do in 5 minutes with VFP. Thanks for the response.
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I've got a webbrowser on my form i'm using for showing my current RSS feeds, problem is one of the sites i visit has javascript errors when it loads forcing the IE "do you want to run scripts..." error message to popup.
What do i need to set/override/do to stop these errors showing and destroying the flow of my tool?
Any ideas?
Thanks
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Go into IE's Tools menu, Internet Options, click on Advanced tab, then uncheck 'Display a notification about every script error'.
RageInTheMachine9532
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Thanks - i was trying to have this still turned on for users who like error messages to appear and do it in my program.
I think i have sussed it now by setting the "Silent" proeprty
on the browser object.
Thanks for your answer
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I completely forgot about Silent! Thanks!
RageInTheMachine9532
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Changing a user's preference is BAD idea without their acknowledgement or approval. You should make this an option in your software, or just rely upon their options already configured for IE (recommended). This is an ill practice and will be received as such.
Microsoft MVP, Visual C#
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I agree, really i just want javascript errors to not show on the one and only web browser in my application and leave the user settings alone. I can do this with popup windows by handling an event.
Is there an event i can handle that basically says "come here when a javascript error occurs" so i can then kill it off?
Setting the browser property "Silent" seems to work but i don't want to use this if it set globally all IE's to use this.
Thanks
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Silent will tell the browser to show or not show dialog boxes. Critical errors and security alerts will still get shown, according to the docs on MSDN. Silent should NOT change the settings for all browser instances, just the one the Silent property was set to True on.
There is also no event fired when a script error occurs, at least on from the browser object. NavigateError will be fired if there is a server error returned, like 404 - Page not found, but it won't catch scripting errors.
RageInTheMachine9532
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Off the top of my head, I'm not sure. If possible, this will definitely get into the advanced hosting interfaces, which you can read more about in the Advanced Hosting Reference[^] on MSDN. This uses a lot of COM interfaces to override and provide user interfaces for the WebBrowser control (or the MSHTML control, but that's too low-level and you have to implement much more that the WebBrowser provides for you).
To get these interfaces defined in a .NET assembly, there is a good trick that you can read about in the CodeProject article, Using MSHTML Advanced Hosting Interfaces[^], which also discusses how to use these to override behavior.
The MSDN link (and other articles in that parent section) cover a lot of functionality that may allow you to capture errors, but from what I've read and remember (since I've done a lot with hosting interfaces both in COM and .NET) I don't think you can. Good luck, though. It's at the very least a good learning experience to read through all that. Might even give you some ideas about additional functionality you may wish to provide to the WebBrowser control in your application.
Microsoft MVP, Visual C#
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How can I get an image of a window or an application that I got its handle...
I did it by activating this window then capturing the screen and saving this image , but I'm asking about a way to get that image without activating the window .
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You actually don't need to capture the screen to get the window, which would require the window to be active so you see it all. Instead of getting the desktop window (a la GetDesktopWindow or something), get the window handle and basically do the same thing. In C#, you can do this easily by enumerating the processes from Process.GetProcesses, find the right process, and then get the main window handle using Process.MainWindowHandle.
This still doesn't change the fact that the window needs to be active (i.e., in the foreground) to get the entire image. Windows (a window manager) draws a 2D surface and nothing more. While a window appears to be "behind" another, it's actually just that the foreground window is being painted in place of the "hidden" regions. In order to accomplish what you want, you'd have to create a virtual frame buffer of sorts in which the window would be paintined in its entirety instead of to the screen buffer, which is all but trivial and would still pose problems (believe me, it's not an easy thing - especially in higher-level languages like C3 and others that target the CLR).
Microsoft MVP, Visual C#
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[sarcasm: on]
All but trivial? Eh, just write all the window painting routines in DirectX, then peel the image from the surface backbuffer 
[sarcasm:off]
As far as I know, there's no way to "get at" the 2d image of a given window without activating it. Windows doesn't store a background image of each running app, it relies on the paint routines to draw them on the fly.
Jeremy Kimball
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I was wonedering if you would mind giving me a C program that convert NFA to DFA.
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Here is C# forum Try this[^] forum.
Mazy
"Man is different from animals in that he speculates, a high risk activity." - Edward Hoagland
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And you probably won't get any help there, either, since this sounds like a homework question and we don't just hand over source for homework. There is a reason you're being asked to solve this kind of problem.
Microsoft MVP, Visual C#
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exaclty. if you don't learn it by yourself, you'd get nothing from the class.
i remember i didn't like those theoretical types of problems from my early classes, but once you get to senior or graduate level, you'll start appreciating the theory you've learnt.
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My brain must not be working quite right today....what are NFA and DFA? 
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(Non-)deterministic Finite-state Automaton. A DFA has a possible outgoing transition to the next state for every defined input. An doesn't necessarily have a transition for every defined input.
Microsoft MVP, Visual C#
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Hi, I want to build MDI Application. I got success in 1st level of MDIChild forms now the problem is that if these MDI child form open new forms those forms cannot be included as MDI child becoz those are child forms of the MDI child form. So could u plz tell me how to proceed in this, to build an application in which all forms as child forms of the main MDI form. or is there any other wayout. Thanks for ur support.
Inpreet Singh
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If you want a child form to launch another child form, try this in your child form:
Dim newChild As New ChildForm2
newChild.MdiParent = Me.MdiParent
I haven't tested this method so I couldn't tell you if it works or not. Also, if you have any tracking code in your MDI Parent for tracking various aspects of your children, that code isn't going to work anymore.
RageInTheMachine9532
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Hello Sir,
As MDIChild cannot be again MDI Parent that why i cannot run this code. There must be some other wayout to include 2nd level or further level forms into as main MDI Child form.
Inpreet Singh
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How many times do we have to tell you that WINDOWS DOES NOT SUPPORT THIS! Rethink your design because it's not going to happen! Unless you want to write your own Window Manager and Window Classes! Good Luck!
RageInTheMachine9532
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This is the THIRD time you've asked this, and with the first two times several people told you that the .NET Framework - and the Windows Management APIs that they encapsulate - do not support this. You'll have to create your own window management APIs in .NET in order to do this, so please quit asking how to use the MDI support in .NET because it will not work.
Microsoft MVP, Visual C#
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