Printing failed

[thebbel]

We use the brother-sdk-upgrade branch. We try to print on the Brother QL820NWB. The printer is found by the plugin and can be selected. The printViaSDK function also calls the success callback. But nothing is printed. The status message displayed is ERROR_BROTHER_PRINTER_NOT_FOUND.

Here is our code:

var objPrintersAll = [];

document.addEventListener('deviceready', function(event) {
printerSearch();
});

function printerSearch(){
cordova.plugins.brotherPrinter.findBluetoothPrinters(printerSearchSuccess, printerSearchError);
}

function printerSearchSuccess(printers){
objPrintersAll = printers
printerSet();
}

function printerSearchError(reason){
alert('error: ' + reason);
}

function printerSet(){
cordova.plugins.brotherPrinter.setPrinter(objPrintersAll[0], printerSetSuccess, printerSetError);
}

function printerSetSuccess(){
var img = "base64string";
cordova.plugins.brotherPrinter.printViaSDK(img, printerPrintSuccess);
}

function printerSetError(reason){
alert('error: ' + reason);
}

function printerPrintSuccess(status){
alert('Printed ' + status);
}

Did we miss something? Any help is welcome. Thank you very much.

[gordol]

Can you send the output of objPrintersAll array after printerSearchSuccess() is called?

[thebbel]

This is the output as JSON string:
[{"model":"QL_820NWB","port":"BLUETOOTH","modelName":"QL-820NWB1259","macAddress":"CC:78:AB:8C:F6:7F"}]

There is only one printer found, which is correct.

[dandray]

Hi,
I also try to print to the same model than you, from an ionic app.
I tried with the normal plugin "printer" and the brother printer gives me an error : "Wrong roll type".
Afterwards I tried with this plugin, by just calling cordova.plugins.brotherPrinter.printViaSDK() function, passing a bitmap image (via document.getElementById('image') which is a bmp image in my html, but it says to me that a bitmap file is expected.
Could someone explain how could use it properly in Ionic ?

Thank you in advance,
Dan

[gordol]

@dandray did you ensure the image is encoded properly, and isn't a raw bitmap?

From the docs:

printViaSDK takes one parameter, which is a base64 encoded bitmap image.

[gordol]

You don't say what branch you're using, but from the dev branch, the following code is used for printViaSDK image decoding. As you can see, it requires a base64 encoded bitmap.

        Bitmap bitmap = null;
        try {
            String encodedImg = args.getString(0);
            bitmap = bmpFromBase64(encodedImg);
        } catch (JSONException e) {
            e.printStackTrace();
            PluginResult result = new PluginResult(PluginResult.Status.ERROR, "An error occurred while trying to retrieve the image passed in.");
            callbackctx.sendPluginResult(result);
            return;
        }

        if (bitmap == null) {
            PluginResult result = new PluginResult(PluginResult.Status.ERROR, "The passed in data did not seem to be a decodable image. Please ensure it is a base64 encoded string of a supported Android format");
            callbackctx.sendPluginResult(result);
            return;
        }

bmpFromBase64 looks like this:

    public static Bitmap bmpFromBase64(String base64){
        try{
            byte[] bytes = Base64.decode(base64, Base64.DEFAULT);
            InputStream stream = new ByteArrayInputStream(bytes);

            return BitmapFactory.decodeStream(stream);
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }

[dandray]

Hi @gordol,
Thank you for your answer. Actually I just converted online a png image into a bmp to do my test. I don't know how I can see this information, but like you said I guess that it is not a base 64 encoded bitmap image.
Concerning the branch that I use, I am not sure because I installed it through "cordova plugin add cordova-brother-label-printer", and I don't see in the README or in the LICENSE file wether it is dev branch or master.

Coming back to my error, what I really want to do is anyway a bit different : I would like to print a div section of my code, so I presume that I have to convert it into a base64 bitmap and afterwards print it via the brotherPrinter.printViaSDK() function.

I put here the code of the function that I call from a button in order to print, to know if I am wrong in the way I try to do it for the moment :
printQR() : void{ (<any>window).brotherPrinter.printViaSDK(BASE64ENCODEDBMP, function(err){ console.log("Error while printing"); }); }
Do I miss something or is it enough to do what I need ?

[firdaus48]

Hi @gordol ,
I am getting following error after calling printViaSDK.

Error: "Unexpected Internal System Error: IllegalArgumentException"

using printer brother QL-1110NWB

this is my code
let image = "isbase64Image"; //sample actually use base64
cordova.plugins.brotherPrinter.printViaSDK(image, function (printResult) {
//var printResult = callback;
console.log(printResult);
},function (err){
console.log(err);
});
Thank you. please help