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How to simulate  Ctrl-Break as a string?

Posted on 2004-09-15
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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?
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Question by:chenwei
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Expert Comment

by:CEHJ
ID: 12063406
What do you mean by 'upto host'?
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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.
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Expert Comment

by:CEHJ
ID: 12063500
How are you doing the telnet bit?
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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.

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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?'
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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.
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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
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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
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Author Comment

by:chenwei
ID: 12063881
the program running on the host dosen't accept "quit" but just "Ctrl+Break".
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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?
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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));
}
...
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Expert Comment

by:CEHJ
ID: 12064249
Why not just call

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

?
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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.
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Accepted Solution

by:
CEHJ earned 20 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
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