cordova-plugin-printer @ionic-native/打印机错误:未捕获(在promise中)：NullInjectorError
cordova-plugin-printer @ionic-native/打印机错误:未捕获(在promise中)：NullInjectorError
提问于 2019-10-18 23:23:23
我需要打印从安卓应用程序使用离子框架(V4)的html内容。我在官方文档中找到了cordova插件打印机，但我不能让它工作。根据docs的说法，您只需稍后安装插件和包装器。
ionic cordova plugin add cordova-plugin-printer
npm install @ionic-native/printer然后，当注入打印机对象时，我得到NullInjector错误
ERROR Error: Uncaught (in promise): NullInjectorError: StaticInjectorError(AppModule)[TabComprobantePage -> Printer]:
StaticInjectorError(Platform: core)[TabComprobantePage -> Printer]:
NullInjectorError: No provider for Printer!
NullInjectorError: StaticInjectorError(AppModule)[TabComprobantePage -> Printer]:
StaticInjectorError(Platform: core)[TabComprobantePage -> Printer]:
NullInjectorError: No provider for Printer!
at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get (core.js:725)
at resolveToken (core.js:11917)
at tryResolveToken (core.js:11861)
at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (core.js:11763)
at resolveToken (core.js:11917)
at tryResolveToken (core.js:11861)
at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (core.js:11763)
at resolveNgModuleDep (core.js:20233)
at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get (core.js:20904)
at resolveNgModuleDep (core.js:20233)
at resolvePromise (zone.js:852)
at resolvePromise (zone.js:809)
at zone.js:913
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423)
at Object.onInvokeTask (core.js:26246)
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:422)
at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:195)
at drainMicroTaskQueue (zone.js:601)我尝试将打印机添加到提供程序/导入，但没有成功。有什么想法吗？
谢谢
回答 1
Stack Overflow用户
发布于 2019-10-24 16:38:09
我现在试过了，如果你把打印机插件作为提供者添加到我的App.Module.ts中，它就能正常工作。
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';
import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';
import { Printer } from '@ionic-native/printer/ngx';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
@NgModule({
declarations: [AppComponent],
entryComponents: [],
imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule],
providers: [
StatusBar,
Printer,
SplashScreen,
{ provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
],
bootstrap: [AppComponent]
})
export class AppModule {}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58453843
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