Error: com.tns.NativeScriptException: Failed to find module: "./workers/enable-bluetooth", relative to: app//

[Mauoanel]

Hi everyone, I'm trying to use a thermal printer but I keep on getting the below error.

The application can connect to the bluetooth printer.
I've also installed other applications from the playstore on my phone just to see if I can print on the thermal printer and they all can print however, when I use this lib, my application cannot print.

I have created a folder under *project/src/app/workers and also created files(enable-bluetooth.js, connect-printer.js)

• Any ideas?

JS: Error Error: com.tns.NativeScriptException: Failed to find module: "./workers/enable-bluetooth", relative to: app//
JS: Printer found = {
JS: "portName": "A0:E6:F8:34:1E:99",
JS: "modelName": "XX706*"
JS: }
JS: Connect error Error: com.tns.NativeScriptException: Failed to find module: "./workers/connect-printer", relative to: app//
JS: ERROR Error: Uncaught (in promise): Error: java.lang.NullPointerException: Attempt to invoke interface method 'int HPRTAndroidSDK.IPort.WriteData(byte[], int)' on a null object reference
JS: push.../node_modules/nativescript-hprt/hprt.js.Hprt.horizontalLine(file: node_modules/nativescript-hprt/hprt.android.js:204:0)
JS: at webpackHotUpdate../app/home/home.component.ts.HomeComponent.printText(file: src/app/home/home.component.ts:138:18)
JS: at webpackHotUpdate../app/home/home.component.ts.HomeComponent.connect(file: src/app/home/home.component.ts:79:13)
JS: at HomeComponent(file: src/app/home/home.component.ts:63:13)
JS: at createClass(file: node_modules/@angular/core/fesm5/core.js:21158:0)
JS: at createDirectiveInstance(file: node_modules/@angular/core/fesm5/core.js:21027:0)
JS: at createViewNodes(file: node_modules/@angular/core/fesm5/core.js:29387:0)

[subhojit-me]

facing the same issue. any update regarding this?

[subhojit-me]

in hprt.android.js file on method Hprt.prototype.enableBluetooth the issue is getting generated from below mentioned line. its not getting the worker file while its there in the nativescript-hprt/workers folder

var enableBluetoothWorker = new Worker('./workers/enable-bluetooth');

[davorpeic]

@subhojit-me @Mauoanel Did you guys follow docs? https://github.com/krushkamx/nativescript-hprt#working-with-workers it looks like there is webpack config missing, so your app is not copying files to the device

[subhojit-me]

Hi @davorpeic after reading the docs, did these steps to use workers.

1. added workers in app/workers
   

2. webpack.config.js
   plugins: [ // Define useful constants like TNS_WEBPACK new webpack.DefinePlugin({ 'global.TNS_WEBPACK': 'true', 'global.isAndroid': platform === 'android', 'global.isIOS': platform === 'ios', process: 'global.process' }), // Remove all files from the out dir. new CleanWebpackPlugin({ cleanOnceBeforeBuildPatterns: itemsToClean, verbose: !!verbose }), // Copy assets new CopyWebpackPlugin([ ...copyTargets, { from: { glob: '**/*.jpg', dot: false } }, { from: { glob: '**/*.png', dot: false } }, // Rev SK { from: { glob: 'workers/**', dot: false } }, // End Rev SK ], copyIgnore), new nsWebpack.GenerateNativeScriptEntryPointsPlugin('bundle'), // For instructions on how to set up workers with webpack // check out https://github.com/nativescript/worker-loader new NativeScriptWorkerPlugin(), ngCompilerPlugin, // Does IPC communication with the {N} CLI to notify events when running in watch mode. new nsWebpack.WatchStateLoggerPlugin() ]

dont know the the dot: false can be an isue or not

[davorpeic]

@subhojit-me Can you try adding app in path for workers in webpack config just to see if this solves the issue? { glob: 'app/workers/**', dot: false }

[subhojit-me]

@davorpeic { glob: 'app/workers/**', dot: false } not working

Would like to share that version 0.9.6 works fine.