|
As far as I can tell from my understanding of UDP and how it is delivered to a process, this should not be possible. However, I'm checking just in case someone can tell me I'm wrong (I'd like to be!).
Is it possible to have several processes on the same computer listen a single UDP multicast port? (let's say 224.0.0.0:60000) The ExclusiveAddressUse shows promise, but doesn't seem to really handle this situation.
The end goal is for 2+ process to listen to the same multicast group and receive all the messages. (I don't want one process to get one message, then the next process get the next, etc.)
[edit] I'm also wanting to stick with IPv4 if possible. [/edit]
Thanks for any advice. (If this doesn't work, I'll have to write a service that lets multiple processes on one computer use some form of IPC to talk to it. That service would then use the one available UDP connection to the multicast group.)
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.
-- modified at 12:36 Monday 16th January, 2006
|
|
|
|
|
I'm using the RijndaelManaged class to encrypt data. One of the things I want to encrypt is a log file that records the usernames of the people who log on to my application.
When I write a single line to a file, I'm able to decrypt the data without a problem, but when I log onto the program again, thereby encrypting a second username to the file, I'm unable to successfully decrypt both lines of data. Only part of the second line is decrypted successfully. Does anyone have any suggestions/comments about why I'm encountering this problem?
|
|
|
|
|
In general, debugging a problem for you requires us to view the code you are using. We may not always be able to help, but seeing your code greatly increases the possibility.
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.
|
|
|
|
|
Okay, here's the code I'm using to encrypt:
public void EncryptData()
{
FileStream fs=null;
if(File.Exists(Directory.GetCurrentDirectory() + "\\c#.ini") == false)
{
fs=new FileStream(Directory.GetCurrentDirectory() + "\\c#.ini",
System.IO.FileMode.CreateNew);
}
else
{
fs=new FileStream(Directory.GetCurrentDirectory() + "\\c#.ini",
System.IO.FileMode.Append);
}
byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
RijndaelManaged RMCrypto=new RijndaelManaged();
System.Security.Cryptography.CryptoStream cryption=new CryptoStream(fs,
RMCrypto.CreateEncryptor(Key, IV), CryptoStreamMode.Write);
StreamWriter tnWriter2 = new StreamWriter(cryption,
System.Text.Encoding.Unicode);
tnWriter2.WriteLine(log);
tnWriter2.Close();
fs.Close();
}
And here's the code for Decrypting:
private void DecryptDataLog()
{
FileStream read=new FileStream(currPath + "\\c#.ini",
System.IO.FileMode.OpenOrCreate);
byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
RijndaelManaged RMCrypto=new RijndaelManaged();
System.Security.Cryptography.CryptoStream cryption=new CryptoStream(read,
RMCrypto.CreateDecryptor(Key, IV), CryptoStreamMode.Read);
StreamReader tnReader = new StreamReader(cryption,
System.Text.Encoding.Unicode);
this.textBox1.Text=tnReader.ReadToEnd();
tnReader.Close();
read.Close();
}
When the file I'm writing to has more than one line, the first few characters of the 2nd, 3rd, etc lines of encrypted text show up as gibberish, while the rest of the line is OK.
|
|
|
|
|
Do you write those lines in a separate step from the code listed, or does the "log" variable have multiple lines in it?
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.
|
|
|
|
|
The log variable is simply this:
log=this.txtBxUsername.Text + ", " + DateTime.Now;
I want only to record the username and the time the user logged on.
administrator, 1/16/2006 10:55:37 AM
တတတတတတတတ襢⭺鉳䀗霳ꇳtrator, 1/16/2006 10:55:48 AM
တတတတတတတတ垵쌂멨蛫륢trator, 1/16/2006 10:56:02 AM
တတတတတတတတ뙩鲂팒ᬵ밞拑䔏⎗trator, 1/16/2006 10:56:15 AM
This is an example of the output I receive.
|
|
|
|
|
How is it that you get a multi-line file from code that only writes one line?
[edit]Oops, just looked back and saw the APPEND option when you open the file. That's the problem.
You need to write the entire file each time if you plan on encrypting and decrypting it. It appears that you accidentally read some of it because you are using the same key and initialization vector each time.[/edit]
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.
-- modified at 14:20 Monday 16th January, 2006
|
|
|
|
|
The file is written to every time a user logs on to the application. I'm appending the new user information to the document each time the user logs on. So, the WriteLine is performed once each time through the application, but the file is appended the next time through.
|
|
|
|
|
I just modified the previous post to comment on this behavior. Check it out.
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.
|
|
|
|
|
So, would you suggest I read the file first and append the content to it the result of that read, then encrypt the whole thing? How are user logon records stored typically?
|
|
|
|
|
thepolishguy wrote: So, would you suggest I read the file first and append the content to it the result of that read, then encrypt the whole thing?
Yep.
thepolishguy wrote: How are user logon records stored typically?
I'm not sure there is a "typical" way. You might consider using a custom event log in Windows.
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.
|
|
|
|
|
What are you using for line breaks? Use Environment.NewLine or "\r\n".
---
b { font-weight: normal; }
|
|
|
|
|
Hello, i have this code and i would like to prevent multipe new forms from opening
[quote]
private void View_Click(object sender, EventArgs e)
{
Export export = new Export();
export.Show();
}
[/quote]
Any Idea of how i can implement this? 
D.M
-- modified at 11:01 Monday 16th January, 2006
|
|
|
|
|
Have a bool value and set it to true when the export object is created.
bool exportCreated = false;
private void View_Click(object sender, EventArgs e)
{
if (!(exportCreated))
{
Export export = new Export();
export.Show();
exportCreated = true;
}
}
Until you set exportCreated to false a new export object will not be able to be created.
Cheers
Kev
|
|
|
|
|
You can show your form as modal dialog
<br />
private void View_Click(object sender, EventArgs e)<br />
<br />
{<br />
Export export = new Export();<br />
export.ShowDialog(this);<br />
}<br />
<br />
<br />
DevIntelligence.com - My blog for .Net Developers
|
|
|
|
|
thanx a lot both of u 
D.M
|
|
|
|
|
hi!
you can also try this...
private Export m_frmExport = null;
private void View_Click(object sender, EventArgs e)
{
if (m_frmExport == null || m_frmExport.IsDisposed)
{
m_frmExport = new Export();
m_frmExport.Show();
}
else
{
//If the m_frmExport is not yet closed/disposed, this will set the focus on this form.
m_frmExport.Activate();
}
}
hope that helps.
|
|
|
|
|
is your export form should be modal?
If not, you can make your export form as class member and construct it in your main form contstructor and at View_Click(..) you can write only
exportForm.Show();
Hope this help
Hesham
|
|
|
|
|
How can I know the size an object in memory?
Anyone?
vSoares
|
|
|
|
|
You can use sizeof or Marshal.SizeOf. However, that doesn't take into account the memory used by the garbage collector to track the object.
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.
|
|
|
|
|
How can i close an application using C#? I have tried using the Process.Kill method and it works pretty well, but does this method force the application to close or does it tell it to close. For example, i have noticed that many applications save a lot of thier settings while closing but when i use the Process.Kill method, they just seem to close forcefully. How do I go around this?
|
|
|
|
|
|
hi guys,
how can i write data/information from the database server to a file stored in the client PCs of my network. can i do it at the same time? if not its ok, as long as i can send all the data to all my client PCs.
the data is not that big, about 20-30 lines of text.(3-5 words per line) it just contains a list of information to be used by my Client side program... tnx..
|
|
|
|
|
Hi there,
I would like to use a progress bar in my application. What i am looking for is a wakeup bar that goes from 0 to 100 and back to 0 again. I would like run it when the process is running so that user know that process is running. Appreciate any feedback.
JS
-- modified at 10:20 Monday 16th January, 2006
|
|
|
|
|
You can use:
progressBar1.PerformLayout();
Or
Application.DoEvents()
SINCERELY ANTHONY ACUÑA
PREFERED PHRASE:
SOMEBODY TELL ME WHY IS MORE REAL WHEN I DREAM THAT I AM WAKE?
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
