How to detect if printer is not found

[Zoran Lazarevič]

Hello!

I have problem detecting when printer is not found if you change printer between prints.

Steps to reproduce :

1. call findPrinter('HP') (printer HP exists)

2. when done finding jzebraDoneFinding() is called and I check if exception is null and printer is not null then its OK

3. then I call findPrinter('xxxx') and there is no such printer installed on machine

4. when done finding jzebraDoneFinding() is called and there is no exception but printer is still there but it is the old one

Is there a way to detetct that second printer is not found?

Environment :

jZebra 1.4.5

FF 17.0.1.

Java Plug-in 10.10.2.18

JRE version 1.7.0_10-b18 Java HotSpot(TM) Client VM

Here is the log from console - there is a warning in log, but I don't know how to use it.

jan 07, 2013 9:34:50 AM jzebra.LogIt log

INFO: jZebra 1.4.5

jan 07, 2013 9:34:50 AM jzebra.LogIt log

INFO: ===== JAVASCRIPT LISTENER THREAD STARTED =====

jan 07, 2013 9:34:59 AM jzebra.LogIt log

INFO: ===== SEARCHING FOR PRINTER =====

jan 07, 2013 9:35:00 AM jzebra.LogIt log

INFO: Found 5 attached printers.

jan 07, 2013 9:35:00 AM jzebra.LogIt log

INFO: Printer specified: \Qhp\E

jan 07, 2013 9:35:00 AM jzebra.LogIt log

INFO: Printer name match: \\ZOKI-PC\HP Photosmart C4100 series

jan 07, 2013 9:35:00 AM jzebra.LogIt log

INFO: Using best match: \\ZOKI-PC\HP Photosmart C4100 series

jan 07, 2013 9:35:06 AM jzebra.LogIt log

INFO: ===== SEARCHING FOR PRINTER =====

jan 07, 2013 9:35:06 AM jzebra.LogIt log

INFO: Found 5 attached printers.

jan 07, 2013 9:35:06 AM jzebra.LogIt log

INFO: Printer specified: \Qxxxx\E

jan 07, 2013 9:35:06 AM jzebra.LogIt log

WARNING: Printer not found: \Qxxxx\E

jan 07, 2013 9:35:06 AM jzebra.LogIt log

WARNING: Ignoring null PrintService

Best regards,

  Zoran

[Tres Finocchiaro]

Zoran,

The wiki page does not explain this well, but the best way to work with multiple printers is to use applet.getPrinters() and use your own code to iterate over them.

This works best after searching for a printer.  This example can be found in sample.html.

This has much room for improvement, so please file an enhancement request here if this is something you'd like improved on.

function findPrinters() {
         var applet = document.jzebra;
         if (applet != null) {
            // Searches for locally installed printer with "zebra" in the name
            applet.findPrinter("\\{dummy printer name for listing\\}");
         }
         monitorFinding2();
}
 function monitorFinding2() {
var applet = document.jzebra;
if (applet != null) {
  if (!applet.isDoneFinding()) {
     window.setTimeout('monitorFinding2()', 100);
  } else {
              var printersCSV = applet.getPrinters();
              var printers = printersCSV.split(",");
              for (p in printers) {
                  alert(printers[p]);
              }
              
  }
} else {
            alert("Applet not loaded!");
        }
      }

-Tres

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[Zoran Lazarevič]

Tres,

I will use applet.getPrinters() and check in list if printer exists.

Thank you for your qucik answer.

Best regards,

   Zoran

[frend Carlo]

On Monday, January 7, 2013 2:15:29 PM UTC+1, Tres Finocchiaro wrote:

Zoran,

The wiki page does not explain this well, but the best way to work with multiple printers is to use applet.getPrinters() and use your own code to iterate over them.

This works best after searching for a printer.  This example can be found in sample.html.

Hi, I don't know if I have the same problem as what he had, I use this applets for my web application. My Problem is how can I refresh a list of printers?

   here is the scenario:

   I run the sample.html program, then click List all printers, I have my list of printers correctly. Now, when I change the name of one of my printers, and then go back to sample.html and click again List all printers, the old printer name that I change is still there, How can I update the list so that the new printer name appears / detected?

thanks in advance


Carlo

[Tres Finocchiaro]

Zoran,

I have this same problem.  I'm not sure if it is caused by the code or if it is a limitation with jZebra.

Feel free to submit an enhancement request with this feature.

For now, you will have to instruct anyone adding and removing print devices mid-flight to close and re-open the web browser for the new printer to appear.  (Some browsers such as chrome allow you to simply close and reopen the tab).

-Tres

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