问JavaPOS打印文本抛出JposException

EN

jpos.JposException: UnicodeDLL:-10An undefined parameter value was set.  
  at jp.co.epson.upos.T88V.pntr.T88VService.createNormalData(Unknown Source)  
  at jp.co.epson.upos.core.v1_13_0001.pntr.CommonPrinterService.executeNormalPrint(Unknown Source)  
  at jp.co.epson.upos.T88V.pntr.T88VService.printNormal(Unknown Source)  
  at jpos.POSPrinter.printNormal(Unknown Source)  
  at de.develman.pos.printer.Printer.printReceipt(Printer.java:58)  
  at de.develman.pos.ui.action.PrintAction.actionPerformed(PrintAction.java:22)  
  at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)  
  ...

private void initPrinter() throws JposException {
    ptr.open("POSPrinter");
    ptr.claim(1000);
    ptr.setDeviceEnabled(true);
    ptr.setMapMode(POSPrinterConst.PTR_MM_METRIC);
}

private boolean printerUseable() throws JposException {
    // check if the cover is open
if (ptr.getCoverOpen() == true) {
    // cover open so do not attempt printing
    System.out.println("printer.getCoverOpen() == true");
    return false;
}

// check if the printer is out of paper
if (ptr.getRecEmpty() == true) {
    // the printer is out of paper so do not attempt printing
    System.out.println("printer.getRecEmpty() == true");
    return false;
}

    return true;
}

public void printReceipt() {
    try {
        initPrinter();
        if (printerUseable()) {
            ptr.printNormal(POSPrinterConst.PTR_S_RECEIPT, "1\n");
            ptr.printNormal(POSPrinterConst.PTR_S_RECEIPT, PAPERCUT);
        }
    } catch (JposException e) {
        // display any errors that come up
        e.printStackTrace();
    } finally {
        // close the printer object
        try {
            ptr.setDeviceEnabled(false);
            ptr.release();
            ptr.close();
        } catch (Exception e) {
    }
}

ptr.printNormal(POSPrinterConst.PTR_S_RECEIPT, "1\n");