File: test_get_printer_basic_attributes.html

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<!DOCTYPE HTML>
<html>
<head>
  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
</head>
<body onload="run()">
<script type="application/javascript">

SimpleTest.waitForExplicitFinish();

async function run() {
  try {
    let printerList = Cc["@mozilla.org/gfx/printerlist;1"].getService(
      Ci.nsIPrinterList
    );

    let printers = await printerList.printers;
    for (let printer of printers) {
      printer.QueryInterface(Ci.nsIPrinter);
      info(`Listing basic attributes for ${printer.name}:`);
      let [supportsDuplex, supportsColor] = await Promise.all([printer.supportsDuplex, printer.supportsColor]);
      info(`* supportsDuplex: ${supportsDuplex}`);
      info(`* supportsColor: ${supportsColor}`);
    }

    ok(true, "Retrieved printer basic attributes successfully.");
  } catch (e) {
    ok(false, `Error thrown while retrieving printer basic attributes: ${e}.`);
    console.error(e);
  }
  SimpleTest.finish();
}

</script>
</body>
</html>