?
Solved

How to simulate  Ctrl-Break as a string?

Posted on 2004-09-15
16
Medium Priority
?
391 Views
Last Modified: 2008-03-03
In my program I want to send "Ctrl+Break" as a command such as "logoff" upto host. How can I do this?
0
Comment
Question by:chenwei
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 8
  • 6
16 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063406
What do you mean by 'upto host'?
0
 

Author Comment

by:chenwei
ID: 12063478
I set up a telenet session and break up the program on host. Normally I can use Ctrl+Break to do this if I use directly the host. Now I have to simulate this "Ctrl+Break" and send upto the host.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063500
How are you doing the telnet bit?
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:chenwei
ID: 12063541
It has little to do with telnet. I don't want to break up the telnet session but the program running on the host.

0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063563
So you mean 'how do i stop the Java program, that i'd normally do with Ctrl-Break, programmatically?'
0
 

Author Comment

by:chenwei
ID: 12063678
No. I used java Swing to program a Telnet-GUI. I use this GUI to send commans via telnet to run the program on host. Now I want to break up the program. So I have to send a command of "Ctrl+Break" via telnet to the host.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063700
Why in that case do you say 'It has little to do with telnet'? It seems to me to have everything to do with telnet. You need to send whatever the quit command is in telnet
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063812
Of course you could just be brutal and close the stream. It would be preferable to send a 'quit' command first though
0
 

Author Comment

by:chenwei
ID: 12063881
the program running on the host dosen't accept "quit" but just "Ctrl+Break".
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063929
There is no command 'quit' in telnet of course.

>>I use this GUI to send commans via telnet to run the program on host

Can you tell me exactly how the telnet bit of the above is being done?
0
 

Author Comment

by:chenwei
ID: 12064076
I use the Thor Telnet Classes to do the telnet connection:
http://mrl.nyu.edu/~danielk/telnet/

My program looks like:
...
private URLConnection urlConnection;
private OutputStream out;
...
out=urlConnection.getOutputStream();
...

try{
 URL url=new URL("telnet", hostIP, port, "",
  new thor.net.URLStreamHandler());
  urlConnection=url.openConnection();
  urlConnection.connect();
  if (urlConnection instanceof TelnetURLConnection) {
      ((TelnetURLConnection)urlConnection).
      setTelnetTerminalHandler(new SimpleTelnetTerminalHandler());
  }
 out=urlConnection.getOutputStream();
...

If I send a command upto host via telnet, I call this function:
...
for(int i = 0; i< command.length(); i++)
{
  out.write(command.charAt(i));
}
...
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12064249
Why not just call

out.close();
urlConnection.disconnect();

?
0
 

Author Comment

by:chenwei
ID: 12064332
out.close() will close the telnet session or something similar. But I have to stop or break up the program, for example an editor, running on the host first.

Besides, if I break up the program running on the host doese't mean I will close the telnet session. I wan to do something else on the host.
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 80 total points
ID: 12064402
You need to tell it to stop. I don't know the telnet protocol, but this looks promising:

http://mrl.nyu.edu/~danielk/telnet/docs/thor/net/TelnetConstants.html#AO

You could maybe mail the author
0

Featured Post

New benefit for Premium Members - Upgrade now!

Ready to get started with anonymous questions today? It's easy! Learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.
Suggested Courses
Course of the Month9 days, 1 hour left to enroll

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question