file - 无法解析文件的所有参数

Question

我正在尝试实现 https://ionicframework.com/docs/native/file-transfer/

因此我需要安装 https://ionicframework.com/docs/native/file/

当我在服务中使用"file"时，出现错误:

无法解析文件的所有参数:(?, ?, ?, ?, ?)。

我知道问号可能类似于循环引用，我从来没有在其他任何地方使用过我的服务，我以前也没有使用过"file"。

import {Injectable} from '@angular/core';
import {File} from "@ionic-native/file";
import { FileTransfer, FileTransferObject } from '@ionic-native/file-transfer';

@Injectable()
export class ImageService {

  constructor(private file: File, private transfer: FileTransfer) {

  }

  public getImagesOfSchedule() {
    const fileTransfer: FileTransferObject = this.transfer.create();
    const url = 'http://techbooster.be/wp-content/uploads/2017/11/logo-long-white.png';
    fileTransfer.download(url, this.file.dataDirectory + 'file.pdf').then((entry) => {
      console.log('download complete: ' + entry.toURL());
    }, (error) => {
      // handle error
    });
  }

}

app.module.ts

providers: [
    StatusBar,
    AuthenticationService,
    ScheduleService,
    ToastService,
    StorageService,
    FacebookService,
    GoogleService,
    ImageService,
    Facebook,
    GooglePlus,
    PushService,
    File, <----------------
    FileTransfer, <--------------
    Push,
    ScreenOrientation,
    {
      provide: HttpService,
      useFactory: HttpFactory,
      deps: [XHRBackend, RequestOptions]
    },
    {
      provide: HttpNoAuthService,
      useFactory: HttpFactory,
      deps: [XHRBackend, RequestOptions]
    },
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler}

Answer 1

好的，我发现在 app.module.ts 中自动导入的 File 类不是:

import { File } from '@ionic-native/file';

相反，它是一些自动导入的标准“lib.es6.d.ts”。

因此，请确保导入正确的"file"类!