Print Unsupported Character Sets

POS Printer Character Set Support

Overview:

The POS printer is equipped to support the GB2312 character set by default, which is predominantly used for simplified Chinese characters. Additionally, it accommodates various Latin character sets, including but not limited to ISO8859-1.

Changing Character Sets:

To modify the printer's character set, developers can use ESC (Escape) commands. Detailed guidance on printer technical document.

Advanced Printing Options Using HTML

Context:

In scenarios where the default character sets do not meet your requirements, or if you desire a more aesthetically pleasing font, printing via HTML content is a viable option.

Implementing HTML Printing:

To enable HTML printing, the following steps are required:

  1. WebView Configuration:

    • Integrate the WebView.enableSlowWholeDocumentDraw() method into your application's source code. This step is crucial as the printing functionality utilizes Android WebView to process HTML content for printing.

  2. Permission Requirements:

    • Your application must declare the android.permission.SYSTEM_ALERT_WINDOW permission in its manifest file. This permission is essential for the printHTML utility to effectively render windows using off-screen HTML content.

Java SDK API

API Overview

printHTML

void printHTML(Context context, String htmlContent, PrinterHtmlListener listener) throws DeviceException;

Print html content, add WebView.enableSlowWholeDocumentDraw() in the calling app, and add this permission android.permission.SYSTEM_ALERT_WINDOW in manifest file.

Parameters

context

Context: context.

htmlContent

String: html content.

listener

PrinterHtmlListener: PrinterHtmlListener.

convertHTML2image

void convertHTML2image(Context context, String htmlContent, PrinterHtmlListener listener) throws DeviceException;

convertHTML2image, add WebView.enableSlowWholeDocumentDraw() in the calling app, and add this permission android.permission.SYSTEM_ALERT_WINDOW in manifest file.

Parameters

context

Context: context.

htmlContent

String: html content.

listener

PrinterHtmlListener: PrinterHtmlListener.

PrinterHtmlListener.onGet

void onGet(Bitmap bitmap, int errorCode);
Parameters

bitmap

Bitmap : generated bitmap.

errorCode

int: returned value:PRINT_ERROR = 0;PRINT_SUCCESS = 1;BITMAP_ERROR = 2;BITMAP_SUCCESS = 3;DEVICE_NOT_OPEN = 4.

PrinterHtmlListener.onFinishPrinting

void onFinishPrinting(int errorCode);
Parameters

errorCode

int: returned value:PRINT_ERROR = 0;PRINT_SUCCESS = 1;BITMAP_ERROR = 2;BITMAP_SUCCESS = 3;DEVICE_NOT_OPEN = 4.

Sample with Java SDK API

Please refer to java API Spec. Download API demo, there is a printHtml method in com.wizarpos.apidemo.action.PrinterAction.java, you can call it like this:

    public void printHtml(final Map<String, Object> param, final ActionCallback callback) {
        try {
            final String htmlContent = "<!DOCTYPE html>" +
                    "<html>" +
                    "<head>" +
                    "    <style type=\"text/css\">" +
                    "     * {" +
                    "        margin:0;" +
                    "        padding:0;" +
                    "     }" +
                    "    </style>" +
                    "</head>" +
                    "<body>" +
                    "Demo receipts<br />" +
                    "MERCHANT COPY<br />" +
                    "<hr/>" +
                    "MERCHANT NAME<br />" +
                    "SHXXXXXXCo.,LTD.<br />" +
                    "530310041315039<br />" +
                    "TERMINAL NO<br />" +
                    "50000045<br />" +
                    "OPERATOR<br />" +
                    "50000045<br />" +
                    "<hr />" +
                    "CARD NO<br />" +
                    "623020xxxxxx3994 I<br />" +
                    "ISSUER ACQUIRER<br />" +
                    "<br />" +
                    "TRANS TYPE<br />" +
                    "PAY SALE<br />" +
                    "PAY SALE<br />" +
                    "<hr/>" +
                    "DATE/TIME EXP DATE<br />" +
                    "2005/01/21 16:52:32 2099/12<br />" +
                    "REF NO BATCH NO<br />" +
                    "165232857468 000001<br />" +
                    "VOUCHER AUTH NO<br />" +
                    "000042<br />" +
                    "AMOUT:<br />" +
                    "RMB:0.01<br />" +
                    "<hr/>" +
                    "BEIZHU<br />" +
                    "SCN:01<br />" +
                    "UMPR NUM:4F682D56<br />" +
                    "TC:EF789E918A548668<br />" +
                    "TUR:008004E000<br />" +
                    "AID:A000000333010101<br />" +
                    "TSI:F800<br />" +
                    "ATC:0440<br />" +
                    "APPLAB:PBOC DEBIT<br />" +
                    "APPNAME:PBOC DEBIT<br />" +
                    "AIP:7C00<br />" +
                    "CUMR:020300<br />" +
                    "IAD:07010103602002010A01000000000005DD79CB<br />" +
                    "TermCap:EOE1C8<br />" +
                    "CARD HOLDER SIGNATURE<br />" +
                    "I ACKNOWLEDGE SATISFACTORY RECEIPT OF RELATIVE GOODS/SERVICE<br />" +
                    "I ACKNOWLEDGE SATISFACTORY RECEIPT OF RELATIVE GOODS/SERVICE<br />" +
                    "I ACKNOWLEDGE SATISFACTORY RECEIPT OF RELATIVE GOODS/SERVICE<br />" +
                    "<br />" +
                    "Demo receipts,do not sign!<br />" +
                    "<br />" +
                    "<br />" +
                    "<br />" +
                    "</body>" +
                    "</html>";
            new Handler(Looper.getMainLooper()).post(new Runnable() {
                @Override
                public void run() {
                    try {
                        device.printHTML(mContext, htmlContent, null);
                        sendSuccessLog(mContext.getString(R.string.operation_succeed));
                    } catch (Exception e) {
                        sendFailedLog(mContext.getString(R.string.operation_failed));
                    }
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
            sendFailedLog(mContext.getString(R.string.operation_failed));
        }
    }
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