Scott A Burch

Thanks.

A stream of six bytes coming in as hex values like so:

30
32
34
39
38
38

Should translate to "024988" in ASCII if I have the UTF-8 setting correct. How can I take those ASCII numbers and format them as "02.49.88"?

Thanks.

Let me correct another mistake: the bytes coming in will be hex, and need to display as ASCII. Sorry, but I had it the wrong way around.

Sorry about that. I re-read the specifications for the incoming stream and 6 bytes will be coming in on the datainputstream  - sorry, long day. These bytes will be ASCII codes and will range only from 0-9. The format I'd like to use for display on println will be "xx.xx.xx", e.g., 02.13.12. What custom format can I use to display them as such? Also, is UTF-8 the proper char set to display ASCII?

Thanks again.

public void ReadFromMachineUTF8() {         try  {           DataInputStream in = new DataInputStream(deviceSocket.getInputStream());  //byte in       byte[] bs = new byte [6];       in.read(bs);       String message = new String(bs, "UTF-8");       System.out.println(message);                 }  catch (IOException e ) {       System.err.println("Caught IOException: cannot identify stream ");     System.exit(0);     }  }

The method below should receive in some bytes that I need to format for print output in this way:

xx.xx.xxxx

How do I format the variable "message"?

public void ReadFromMachineUTF8() {         try  {           DataInputStream in = new DataInputStream(deviceSocket.getInputStream());  //byte in       byte[] bs = new byte [7];       in.read(bs);       String message = new String(bs, "UTF-8");       System.out.println(message);                 }  catch (IOException e ) {       System.err.println("Caught IOException: cannot identify stream ");     System.exit(0);     }  }

thank you!

I have a working program that has a Timer that gets its start date and time from a Date JSpinner, then fires a TimerTask to complete a task. It works perfectly well. As an experiment, I set up a second Date JSpinner with a date much later than the first to see if it would fire the same TimerTask again at the later date and time. It did not. Is a TimerTask ever reusable, or am I doing something wrong? Should the second Date JSpinner be associated with its own separate TimerTask? I could post the code, but it may be quicker to ask the question first in case I'm barking up the wrong tree.

Thank you.

I am using a DateSpinner to get a date and time to begin a task. I am trying to use java.time, but the error I am getting when converting to string through the formatter tells me that the getValue method is outputting a util.date, incompatible with java.time. Is there a way to get a string value from DateSpinner that is compatible with java.time? Or should I not use java.time and go back to using the older util.date?

Thanks as always!


[code=java]

try {
//Date and time to start event

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM-dd-yy hh:mm a");
String aTime = formatter.format(aSpinner.getValue()); // this is the problem!
jTextArea1.append("date is " + aTime);
LocalDateTime aDateTime = LocalDateTime.parse(aTime, formatter);
Instant instant = aDateTime.atZone(ZoneId.systemDefault()).toInstant();
Date aDate = Date.from(instant);

timer.schedule(new ATask(), aDate);

} catch (DateTimeException e) {
System.exit(0);
}


[/code]

Thread.sleep is what I was looking for ... it's purpose is for pacing. Just read the Oracle doc on the subject. Thanks to all for the suggestions.

I am writing a program that is delivering bytes over a socket to a machine that responds to commands. The machine needs at least 100 milliseconds between commands to execute properly. I have one sequence that is sending too quickly. How do I build in a delay of 200 milliseconds between commands?

thanks!

Made the change and it works perfectly. Thanks again!

Thanks for the reply. Just for my education, what does that change do in terms of performance?

It compiles and runs, but system exit is being invoked in the dataoutputstream section "System.err.println("Caught IOException: xxxx "); " around line 80. It could be writing hex to the datastream all wrong, or it's the wrong stream ( bytearray stream? ), or it's not getting the Socket ipAddress and port parameters and timing out, or all the above. Any suggestions? Thanks !


import java.util.*; import java.text.*; import java.io.Console; import java.io.*; import java.net.*; import java.time.*; public class CDeckControl3 { Console console = System.console(); DateFormat df = new SimpleDateFormat("MM-dd-yy hh:mm a"); // not thread safe; fix this Socket deviceSocket = new Socket(); public CDeckControl3() { Timer timer = new Timer(); System.out.println("\n Current time is " + df.format( new Date())); //enter the IP address String ipAddress = console.readLine("Enter IP address of device to connect > "); // port number to be specifed is 1111 String whatPort = console.readLine("Enter the port # of that device > "); int port = Integer.parseInt(whatPort); //create socket for device IP address try { Socket deviceSocket = new Socket(ipAddress, port); } catch (UnknownHostException e) { System.err.println("UnknownHostException: don't know this host" + e.getMessage()); } catch (IOException e) { System.err.println("Caught IOException: couldn't get I/O for this connection" + e.getMessage()); } String startTime = console.readLine("Record start [ mm-dd-yy hh:mm AM or PM ] > "); String endTime = console.readLine("Record stop [ mm-dd-yy hh:mm AM or PM ] > "); try { //Date and time to start event Date date = df.parse(startTime); timer.schedule(new StartTask(), date); } catch (ParseException e) { e.printStackTrace(); } try { //date and time to stop event Date dateStop = df.parse(endTime); timer.schedule(new EndTask(), dateStop); } catch (ParseException e) { e.printStackTrace(); } } class StartTask extends TimerTask { public void run() { System.out.println("Running Task"); System.out.println("Current Time: " + df.format( new Date()) + "\n"); try { //byte[] b2 = new byte[] {(byte)0xA3}; //byte to eject disc DataOutputStream out = new DataOutputStream(deviceSocket.getOutputStream()); out.write(0xA3); } catch (IOException e ) { System.err.println("Caught IOException: xxxx "); System.exit(0); } } } class EndTask extends TimerTask { public void run() { System.out.println("Stopped! ..." ); System.out.println("Current Time: " + df.format( new Date()) + "\n"); //timer.cancel(); } } public static void main(String[] args) throws ParseException { new CDeckControl3(); } }

This is a console application, the purpose of which is to write a byte to a network socket using a TimerTask. Compiling gives me an error on line 23 - which I knew would happen - that the variable deviceSocket cannot be found. I created it in the main section of the program because that's where the user answers questions about start and stop times, and IP address and port info. My problem is that I'm stuck for alternatives - how can I restructure this so that the variable can be found? It has to be in the StartTask TimerTask because the byte needs to written only when StartTask executes. Is it possible to ask for console input outside the main section of the program? When I tried that, I wound up with lots more errors and got really lost. Thanks!




import java.util.*; import java.text.*; import java.io.Console; import java.io.*; import java.net.*; public class CDeckControl2 { static DateFormat df = new SimpleDateFormat("MM-dd-yy hh:mm a"); static Timer timer = new Timer(); private static class StartTask extends TimerTask { public void run() { System.out.println("Running Task"); System.out.println("Current Time: " + df.format( new Date()) + "\n"); try { byte[] b2 = new byte[] {(byte)0xA3}; //byte to eject disc OutputStream outStream = deviceSocket.getOutputStream(); DataOutputStream outDatastream = new DataOutputStream(outStream); outDatastream.write(b2); } catch (IOException e ) { } } } private static class EndTask extends TimerTask { public void run() { System.out.println("Stopped! ..." ); System.out.println("Current Time: " + df.format( new Date()) + "\n"); timer.cancel(); } } public static void main(String[] args) throws ParseException { Console console = System.console(); //enter the IP address String ipAddress = console.readLine("Enter IP address of device to connect > "); // port number to be specifed is 1111 String whatPort = console.readLine("Enter the port # of that device > "); int port = Integer.parseInt(whatPort); //create socket for device IP address try { Socket deviceSocket = new Socket(ipAddress, port); } catch (UnknownHostException e) { System.err.println("UnknownHostException: don't know this host" + e.getMessage()); } catch (IOException e) { System.err.println("Caught IOException: couldn't get I/O for this connection" + e.getMessage()); } System.out.println("\n Current time is " + df.format( new Date())); String startTime = console.readLine("Record start [ mm-dd-yy hh:mm AM or PM ] > "); String endTime = console.readLine("Record stop [ mm-dd-yy hh:mm AM or PM ] > "); //Date and time to start event Date date = df.parse(startTime); //date and time to stop event Date dateStop = df.parse(endTime); timer.schedule(new StartTask(), date); timer.schedule(new EndTask(), dateStop); } }

that's what I was looking for. Thanks again!

Let me try to explain this better. Got rushed on posting yesterday and messed it up - sorry for the confusion. I am posting abstracted code that goes to the heart of the question; there is too much other code to post have it compile. The code was originally written as a console application, that is, no GUI. I could put the integer values directly into the main() method, compile it, and it would run. What I am trying to do is give it a GUI, specifically, the integer values in the main() method are supplied by three JSpinners. I am looking for suggestions as to how I can express the main() method without running into the nonstatic variable problem. I know the integer arguments cannot live in the main() method, I just don't know of an alternative. Suggestions? (Besides give up?) Thanks!


public class A extends JFrame{ Integer b = (Integer)hSpinner.getValue(); Integer c = (Integer)mSpinner.getValue(); Integer d = (Integer)sSpinner.getValue(); public A(int b, int c, int d) { } public void start() { // stuff } public static void main(String[] args) { System.out.println(" A is launched ..."); A z = new A(b, c, d); // this is the problem - original code had integer number values inserted directly like this: A z =new A(1,2,3); z.start(); packagex.JFrame var=new packagex.JFrame(); var.setSize(450,325); var.setVisible(true); } }