Re: System.out PrintWriter print() and flush() not flushing?
On 29 Feb., 18:32, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:
Karsten Wutzke wrote:
On 29 Feb., 06:23, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:
Karsten Wutzke wrote:
On 29 Feb., 05:54, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:
Karsten Wutzke wrote:
Hello!
I have a thread that listens to a server socket. When a message
arrives, I print it via
System.out.println("...");
While the program is listening and not receiving a message I simply
want to print one dot "." so the user can see the program is still
listening. However, the dots are not printed, they only appear after
another call to println(). I also call flush() after print but it
doesn't flush the buffer.
Does anyone know how to print only a dot without a newline? How?
Karsten
Are you trying to read from the console too? If that is the case I
think you will be unsuccessful.
From the docs for PrintWriter
"Unlike the PrintStream class, if automatic flushing is enabled it will
be done only when one of the println, printf, or format methods is
invoked, rather than whenever a newline character happens to be output.
These methods use the platform's own notion of line separator rather
than the newline character."
This could be part of the problem too. Maybe it would be better to use
PrintStream rather than PrintWriter.
--
Knute Johnson
email s/nospam/knute/
--
Posted via NewsDemon.com - Premium Uncensored Newsgroup Service
------->>>>>>http://www.NewsDemon.com<<<<<<------
Unlimited Access, Anonymous Accounts, Uncensored Broadband Access
Oops... I meant PrintStream from the beginning of my posting. So the
subject should read:
"System.out PrintStream print() and flush() not flushing?"
How do I go? Using
System.out.print(".");
System.out.flush();
Does not show the dot immediately as I'd like...
Karsten
I tried a simple program to do that and pause for a second and it works
fine on my XP computer. What OS are you using? Are you trying to do
input from the console too?
--
Knute Johnson
email s/nospam/knute/
--
Posted via NewsDemon.com - Premium Uncensored Newsgroup Service
------->>>>>>http://www.NewsDemon.com<<<<<<------
Unlimited Access, Anonymous Accounts, Uncensored Broadband Access
Could you post your simple program please?
I'm not getting any input from the console at any time. The software
is GUI driven.
It's strange.
Hmmm here's the code I use:
while ( sck.isConnected() )
{
//flag raised when server delivers a null
boolean wasNullBefore = false;
try
{
String strMessage = br.readLine();
if ( strMessage != null )
{
if ( wasNullBefore )
{
//last message was null, so a dot was printed,
//make newline so non-null message is printed in a new
line
System.out.println();
}
//message factory
Message msg = mf.createIncomingMessage(strMessage);
processIncomingMessage(msg);
//lower flag
wasNullBefore = false;
}
else
{
//if server delivers null print a dot (so not so many
lines get wasted)
System.out.print(".");
System.out.flush();
//raise flag
wasNullBefore = true;
}
Thread.sleep(250);
}
catch ( Exception e )
{
e.printStackTrace();
}
}
Well I simply want to print dots on null messages so I don't waste a
whole line every 4th of a second... that's about it. But flush doesn't
flush. *shrug*
Karsten
Karsten:
I see your problem, BufferedReader.readLine() is not going to return a
null until the end of stream. Which if you are reading from a stream
attached to a socket won't be until the socket is closed.
You could set a timeout on the socket to a few seconds and write the .
when the exception is caught. See pseudo code below
try {
socket.setSoTimeout(5000);
String str = null;
do {
try {
str = br.readLine();
} catch (SocketTimeoutException ste) {
System.out.print(".");
}
} while (str != null) ;
} catch (IOException ioe) {
//
}
Read the docs for Socket.setSoTimeout() for details.
I tried your solution, but there's still no flush on printing just a
dot without println...
while ( sck.isConnected() && !sck.isClosed() )
{
boolean doNewline = false;
try
{
//times out according to socket (here one sec)
String strMessage = br.readLine();
if ( strMessage != null )
{
if ( doNewline )
{
System.out.println();
}
System.out.println(" IN <<< '" + strMessage + "'");
Message msg = mf.createIncomingMessage(strMessage);
processIncomingMessage(msg);
doNewline = false;
}
Thread.sleep(msec);
}
catch ( SocketTimeoutException ste )
{
//doesn't flush
System.out.print(".");
System.out.flush();
doNewline = true;
}
catch ( Exception e )
{
e.printStackTrace();
}
}
}
When I let the program run for a few seconds nothing gets printed
while receiving no data (timeout), when I close the program and return
to the shell, all missing dots are printed all at once. But this is
not what I wanted. I want to print just a dot without newline for each
second the socket doesn't receive data.
Im out of ideas *shrug*... sometimes the easiest things to do turn out
to be the most pain in the...
Karsten