Print number 0 (zero) at the end of every line

[AurumAustralis]

Hello, I have a problem when I print text: at the end of each line it also prints the number 0 (zero)

p.Bold(true).Size(2, 2).Write("Hello World")

Ouput: Hello World0

[hennedo]

Mhh. What kind of printer are you using? Could you provide me with a minimal (but complete) code snippet that causes this bug to appear?

[AurumAustralis]

I was also thinking that it could be the printer, is a "sol802" thermal printer http://postektronics.com/productdetails/SOL802

The code: package main

import ( "net"

"github.com/hennedo/escpos"

)

func main() { socket, err := net.Dial("tcp", "192.168.7.90:9100") if err != nil { println(err.Error()) } defer socket.Close()

p := escpos.New(socket)

p.Bold(true).Size(2, 2).Write("Hello World")
p.LineFeed()

p.PrintAndCut()

}

And the result: Hello World0

[AurumAustralis]

Printer config

`Print Speed 250mm/s Print Density Medium Print Width 72mm Print Direction Normal Print Font 12*24 Auto Cut on ChangePaperRePrint off Buzzer Enable Error On

Command Set ESC/POS Code Page ISO-8859-15`

[hennedo]

Sadly there is not that much information available about the printe. Currently my best guess is that it has to do something with the cut command. In the ESC/POS manual there are 3 ways to perform a cut. Could you clone the library locally and replace it in your project with the local version?

Within your go mod, just before the require part

replace github.com/hennedo/escpos => /home/.../escpos

Then replace

func (e *Escpos) Cut() (int, error) {
    return e.WriteRaw([]byte{gs, 'V', 'A', '0'})
}

with

func (e *Escpos) Cut() (int, error) {
    return e.WriteRaw([]byte{esc, 'i'})
}
// or if that does not work
func (e *Escpos) Cut() (int, error) {
    return e.WriteRaw([]byte{esc, 'm'})
}

One of those could possibly work..

[AurumAustralis]

I'm going to test with that code. Thank you very much for the reply and speed!

[AurumAustralis]

It did not work I'm going to keep trying and I'll put any solution here . Thanks again.

[hennedo]

Sorry that I could not be of more help. If you do find any solution, even if it's another open source library that I can have a look at that works, I'm interested!

[AurumAustralis]

I am adapting the augustopimenta library with yours and so far it works: charset, image, barcode (qr, upca, ean8 and ean13) and I added tables with tablewriter

Links to libraries "github.com/augustopimenta/escpos" "github.com/olekukonko/tablewriter"

I am working with Code128 and a problem with the images

When I finish I upload it to github

Thanks again Hendrik!

[pinpox]

I'm running into this issue aswell, with an EPSON TM-T88II printer. Did you ever find a solution to this?

Printing images works fine, but any text has a "0" appended

[hennedo]

Dang. I if @AurumAustralis did not find a solution for this I might need to buy an EPSON TM-T88II off of ebay-kleinanzeigen to work on a solution :D

[hennedo]

After some debugging on my "new" printer, it seems it does not support the upside down printing, so as the library always pushes the current state when you call write, it sends the codes for upside down printing. the printer then ignores the ESC+{ and prints the 0 which is intended to tell the printer "no upsidedown printing please".

I refresh every setting set in the library with each write because when using a networked printer it's quite possible that another user sets different settings. I need find a solution for this. Maybe some sort of feature enable / disable depending on the model.

[pinpox]

Thanks for investigating! Let me know if you need help testing, I've got a printer sitting on my desk.

[hennedo]

So I added a config struct to disable certain features that are called during the write process and added some Device configs. Could you replace your dependency with a local copy of the compatibility_fix branch and confirm that everything works fine when you are adding the SetConfig line right after the escpos.New call?

p := escpos.New(socket)
// add here:
p.SetConfig(escpos.ConfigEpsonTMT88II)

Also if @AurumAustralis is still interested, would be good to know if this works for you also...

[pinpox]

@hennedo I can confirm this fixes the issue with the Epson TM T88II, no more zeros. I noticed though, the QRcodes are not printed, not sure if this is related to the fix or a different issue, the code I'm using is this: https://gist.github.com/pinpox/c360111ede61f8f62aa0c6cd2a3fb284

[hennedo]

As QR code printing is a printerfeature the qr code is not generated by the library. Therefore the printer needs to support qr code printing. I do not think the TM-T88II supports QR code printing. I'll merge the fix in master then!