[bug] A0 characters in the first line

[龙崎流也]

Updated 2022-11-09: With the latest version 1.13.0, you may not run into these issues any more, just check out receiptio and add an option -p generic, everything should be normal now.

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Hi team, thanks for the great work in advance!

I would like to report a bug here, check below as a reproduction repository:

https://github.com/Ynewtime/receiptline-report

Basic description: I copied the code directly from https://github.com/receiptline/receiptio and tried to print out something, but there is always an A0 characters in the first line:

const receiptio = require('receiptio');

const receiptmd = `^^^RECEIPT

12/18/2021, 11:22:33 AM
Asparagus | 1| 1.00
Broccoli  | 2| 2.00
Carrot    | 3| 3.00
---
^TOTAL | ^6.00`;

receiptio.print(receiptmd, '-d 192.168.192.168 -p escpos -c 42').then(result => {
    console.log(result);
});

I switched another printer model but it appeared again.

So I suspect if it was related to the receiptline codebase.

Thanks again for the great work!

[receiptline]

Thanks for your report!

escpos is designed at the command level of Epson TM-T88IV released in 2006.
It seems that your models have not reached this compatibility level.

A0 in the first line is the FS ( A command.
0 before the horizontal line is the FS C n command.

Probably image printing and upside-down printing will not work correctly either.

We will consider adding a command set using the old ESC/POS.

[龙崎流也]

Thanks for feedback!

Yah my printer modals may not be compatible with this great tool but I've found some workaround to resolve the A0 in the first line and 0 before the horizontal line issue:

A0 in the first line issue: By updating this line to:

return '\x1b@\x1da\x00\x1bM' + (printer.encoding === 'tis620' ? 'a' : '0') + '\x1b \x00\x1cS\x00\x00' + (this.spacing ? '\x1b2' : '\x1b3\x00') + '\x1b{' + $(this.upsideDown) + '\x1c.';

0 before the horizontal line issue: By updating this line to:

hr: (width) => '\x1cC\x00\x1c.\x1bt\x01' + '\x95'.repeat(width),

Same testing code:

const receiptio = require('receiptio');

const receiptmd = `^^^RECEIPT

12/18/2021, 11:22:33 AM
Asparagus | 1| 1.00
Broccoli  | 2| 2.00
Carrot    | 3| 3.00
---
^TOTAL | ^6.00`;

receiptio.print(receiptmd, '-d 192.168.192.168 -p escpos -c 42').then(result => {
    console.log(result);
});

Result comparison:

I am still learning how to know which compatibility level my models support, hopefully can help!

[receiptline]

Thank you very much!

The following issue and pull request may be helpful.

• #15
• #23

We will try an experimental implementation for generic printers.

[龙崎流也]

Really helpful! Thanks, I've customized the commands and it works great!

[龙崎流也]

Just review the latest 1.13.0 commits, and boom! It works amazingly great, now all the custom commands I made for my printers can be removed, just by adding an option in receiptio: -p generic! Also I tested the QR code support and it's also there! Really amazing work, thank you teams.