目录

Obtaining Book Information

You can use DocumentViewPicker to import a book file to the app sandbox directory. Then your app can import the book file to the bookshelf, use the parsing capability to obtain the book information including the book cover, book title, and author, and display the information on the bookshelf.

Service Process

API Description

This function involves three APIs. See the following table for detailed API information.

API Description
getDefaultHandler(path: string): Promise<BookParserHandler> Obtains the default book parser.
getBookInfo(): BookInfo Obtains book information.
getResourceContent(spineIndex: number, filePath: string): ArrayBuffer Obtains book content.

Development Procedure

  1. Import required modules.

    import { common } from '@kit.AbilityKit';
import { bookParser } from '@kit.ReaderKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { image } from '@kit.ImageKit';

  2. Initialize the book parser for the book file that has been imported to the app sandbox directory.

    private defaultHandler: bookParser.BookParserHandler | null = null;

aboutToAppear(): void {
  this.init().then(() => {
  });
}

private async init() {
  let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
  let path: string = `${context.filesDir}/abc.epub`;
  try {
    this.defaultHandler = await bookParser.getDefaultHandler(path);
  } catch (error) {
    hilog.error(0x0000, "ReaderLog", `getDefaultHandler failed, Code: ${error.code}, message: ${error.message}`);
  }
}

  3. Obtain and display the book title, author, and cover.

    @State bookCover: PixelMap | null = null;
@State bookTitle: string = '';
@State author: string = '';

aboutToAppear(): void {
  this.init().then(() => {
    this.getBookInfo();
  });
}

private async getBookInfo() {
  let imageSource: image.ImageSource | null = null;
  try {
    let bookInfo: bookParser.BookInfo | undefined = this.defaultHandler?.getBookInfo();
    if (bookInfo) {
      this.bookTitle = bookInfo.bookTitle || '';
      this.author = bookInfo?.bookCreator || '';
      let buffer = this.defaultHandler?.getResourceContent(-1, bookInfo.bookCoverImage);
      if (buffer) {
        imageSource = image.createImageSource(buffer);
        this.bookCover = await imageSource.createPixelMap();
      }
      hilog.info(0x0000, 'ReaderLog', 'getBookInfo bookInfo is: ' + JSON.stringify(bookInfo));
    }
  } catch (error) {
    hilog.error(0x0000, 'ReaderLog', `getBookInfo failed, Code: ${error.code}, message: ${error.message}`);
  } finally {
    if (imageSource) {
      imageSource.release();
    }
  }
}

build() {
  Column() {
    Text('Book title:' + this.bookTitle)
      .fontSize(20)
      .fontColor("#E6000000")
      .margin({ top: 50 })
    Text('Author:' + this.author)
      .fontSize(20)
      .fontColor("#E6000000")
      .margin({ top: 10 })
    Image(this.bookCover)
      .width(200)
      .aspectRatio(3 / 4)
      .borderRadius(5)
      .margin({ top: 10 })
  }
  .alignItems(HorizontalAlign.Start)
  .margin({ left: 10, right: 10 })
}