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When we encrypt some data with Cryptostream, we get a stream containing that data by using the CreateEncryptor method. We can store it in a file for example. Afterwards, when we want to decrypt it again we use CreateDecryptor with the same key and IV that we used for encryption.
My question is: Where are the key and the IV stored so that the decryption method makes sure that they are the same that were used for encryption?
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I tried many ways to embed window media player in my C# page to play a song.But it didn't work properly.The song coudn't play.Almost it only work in html file.Anyone help me.
I use VS 2003,Framework 1.1.
nothing
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I used WMP 10 SDK for VS 2003,Framework 1.1.Is it right ?
I wonder that WMP 10 SDK is suit with VS 2003 or not.
nothing
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Hello everyone,
I am facing problem using FullScreen mode in Vista. Everything works fine under XP but things don't play as they should under Vista!
Here is the problem,
I have created FullScreen Toggle which simply toggles between FullScreen mode and Normal (NOT FullScreen) mode. Using the Windows Application in Xp it does as it should be, but when I use the very same Windows Application in Vista it behavious strangely.
Under Vista Operating System, the FullScreen mode works only ONCE! When I try to got o FullScreen for the second time and so on, I get the New Video Window opening but it doesn's display on my computer screen. I see a New Video Window opened in my Taskbar. since the Toggle is done by double clicking on the video screen, I can double click and get back to normal screen with my video playing!
I have search the internet for the issue related with Vista and Fullscreen mode and there has been number of different reports. But neither of the explained in detail what thier problem was and nor a fix was suggested.
Can anyone be kind enough to take me moment and let me know what is going on regarding FullScreen mode and Vista?
Thank you very much and have a great day.
Khoramdin
-- modified at 23:55 Wednesday 24th October, 2007
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The .Net documentation for String.Contains() (http://msdn2.microsoft.com/en-us/library/system.string.contains.aspx) says it may raise the System.ArgumentNullException exception. This is the only exception listed for this method.
However, when I use this method to examine the contents of string based object properties, I'm getting the following exception instead:
System.NullReferenceException: Object reference not set to an instance of an object
Note that the exception doesn't happen unless I use the .Contains() method.
For instance, in the following code:
string myString = object.stringProperty;<br />
MessageBox.Show(myString);<br />
<br />
if (myString.Contains("a")) { ... }
no exception is thrown until the "if" statement is executed.
So, is the documentation incorrect, or is there something special about the empty string being held by the object property?
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Have you checked myString to see if it's null or not?
Cyril Connolly wrote: Truth is a river that is always splitting up into arms that reunite. Islanded between the arms, the inhabitants argue for a lifetime as to which is the main river.
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Clearly, I have not  . But I'm not sure what point you are making?
Am I wrong in assuming that the list of Exceptions in the String.Contains() documentation is exclusive and complete?
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It's not a string exception, it's a runtime exception. You're calling a method on a null object.
Cyril Connolly wrote: Truth is a river that is always splitting up into arms that reunite. Islanded between the arms, the inhabitants argue for a lifetime as to which is the main river.
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I guess I'm confused why none of the other code is throwing an exception on the null object. I can pass that object to MessageBox.Show, I can add another string to it, etc. It's only when I call .Contains() that it coughs up a lung...
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However, thanks for your help. I'll guess I'll have to be more defensive in null checking on reference values returned from properties. Dang those inconsiderate objects!
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Are you aware of FxCop[^]? I don't know if it will identify the problem above, but I analyzed a project and FxCop found a couple of instances of not checking if an object was valid before using it.
Cyril Connolly wrote: Truth is a river that is always splitting up into arms that reunite. Islanded between the arms, the inhabitants argue for a lifetime as to which is the main river.
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My application has got 3-4 solution and each solution have few projects in it. Currently all the confiugration data for my application is scattered across various project.config files in individual project.
I want to merge all these configuration settings and make a one single config file which will be accessed by all solutions / projects. If possible I would like to read/write this common file using "Properties.Settings" class as we normally read the config files.
Can any one give me idea on how to achieve the above thing?
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I'm having an issue trying to get my clients to handle messages that are passed from a server to a shared object... Any remoting gurus out there are free to enlighten me... 
Ok.. First of all, here is the interface created to by implemented by the remote object:
namespace WarComInterface<br />
{<br />
<br />
public delegate void ServerToClientEvent(object sender, ServerToClientEventArgs e);<br />
<br />
public interface ICom<br />
{<br />
Joueur clientReqJoueur(string nomJoueur);<br />
<br />
event ServerToClientEvent ServerToClientMsg;<br />
<br />
void clientMsg(EventTypes.EventsFromClient typeEvent, string nomJoueur);<br />
}<br />
}
Now, here is the part where the client gets a reference to the remote object and sets a handler to listen for events coming from the server:
<br />
try<br />
{<br />
TcpChannel channel = new TcpChannel();<br />
ChannelServices.RegisterChannel(channel, false);<br />
remoteComm = (WarComInterface.ICom)Activator.GetObject(typeof(WarComInterface.ICom),<br />
"tcp://"+txt_adrip.Text + ":1069/jh");<br />
<br />
remoteComm.ServerToClientMsg += new ServerToClientEvent(MessageFromServer);<br />
<br />
And finally, this is the part inside the shared object. It's within a public method called by the server (some sort of public void sendMsg())
<br />
evArg = new ServerToClientEventArgs(EventTypes.EventsFromServer.UpdateStats, targetPlayer);<br />
if (ServerToClientMsg != null)<br />
{<br />
ServerToClientMsg(this, evArg); <br />
}<br />
It fires up the following exception : This remoting proxy has no channel sink which means either the server has no registered server channels that are listening, or this application has no suitable client channel to talk to the server.
Any help would be greatly appreciated!
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I've seen that message. For me, it meant that the client was not defining a suitable channel for the event callbacks. What makes yours "unsuitable" might be the absence of a channel altogether (which I doubt, looking at your sample), permissions (which I don't understand), or the absence of the typeFilterLevel attribute for the channel. In the server's config file, the latter would look like:
<serverProviders>
<formatter ref="binary" typeFilterLevel="Full" />
</serverProviders>
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Hello everyone,
How can I get the focus on a Window Form? This is my problem. I have created a Media Player using DirectShow in C# enviroment. When I use the full-screen mode and enlarge the screen after reducing the size to normal, no longer I can have any form open on the TOP of the other windows.
Thank you very much and have a great day,
Khoramdin
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This means your form is topmost. You can change ths property.
Or do you mean forms in your program ? If the form is modal, then it takes the focus and no other form can be accessed.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Hello Christian,
Thanx for the reply. You were absolutly correct. I checked the codes and realised where the prroblem was.
Thank you for the help.
Khoramdin
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Is there a way to change a color with a number in code? It's confusing, but I want to set a timer to change 1 of the 3 color parts, and I just need to know how to reach them. Thanks in advance.
The most knowledge doesn't mean the most wise...
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Hi,
try this:
Color color;
...
int red=color.Red+1;
if (red>255) red=255;
int green=color.Green;
int blue=color.Blue-1;
if (blue<0) blue=0;
color=Color.FromArgb(red, green, blue);
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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Thanks, Luc.
The most knowledge doesn't mean the most wise...
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Hw do I set that to the forms backcolor?
The most knowledge doesn't mean the most wise...
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Hi,
the main thread simply does myForm.BackColor=color;
for animation purposes, I prefer the Windows.Forms.Timer timer; other timers tick
on a different thread and would need Control.InvokeRequired and Control.Invoke()
to touch the Form.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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Is there any way to make a method that the form continuously calls on? Or, is there a way to make a method that it calls without you having to call it? Like, Say how Form1_Load gets called on its own, is there a way to do that with a method you make? I hope that didn't come out too confusing, much thanks in advance.
-- modified at 17:00 Wednesday 24th October, 2007
The most knowledge doesn't mean the most wise...
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To create a method that form continuosly calls you have to create a timer object, and initalize it on constructor or form load.
See and example here http://www.csharphelp.com/archives/archive90.html
Visit my blog at http://dotnetforeveryone.blogspot.com
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