Ionic 2 文件插件使用示例 [英] Ionic 2 File Plugin usage examples

问题描述

有没有人有关于如何在 Ionic 2/Angular 2 项目中使用 Cordova Native File Plugin 的完整示例?

Does anyone have complete examples about how to use the Cordova Native File Plugin in a Ionic 2/Angular 2 project?

我安装了这个插件，但文档对我来说似乎没有多大意义，因为它是零散的并且缺乏完整的示例，包括所有需要的导入.

I installed this plugin but the documentation don't seems to make much sense to me due the fact it is fragmented and lacks of a complete example, including all needed imports.

例如，下面的示例没有显示 LocalFileSystem 或 window 等对象的来源.

For example, the following example don't shows where objects like LocalFileSystem or window came from.

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fs) {

    console.log('file system open: ' + fs.name);
    fs.root.getFile("newPersistentFile.txt", { create: true, exclusive: false }, function (fileEntry) {

        console.log("fileEntry is file?" + fileEntry.isFile.toString());
        // fileEntry.name == 'someFile.txt'
        // fileEntry.fullPath == '/someFile.txt'
        writeFile(fileEntry, null);

    }, onErrorCreateFile);

}, onErrorLoadFs);

例如，我需要创建一个属性文件.首先，我需要检查应用程序沙箱存储区域中是否存在文件，如果不存在，我必须创建它.然后我必须打开文件写入数据并保存.我怎么能这样做?

For example, I need to crate a property file. First I need to check if a file exists on app sandbox storage area, if don't exists I must create it. Then I must open the file write data and save it . How could I do that?

推荐答案

Ionic 2 带有一个 Cordova 文件插件包装器:http://ionicframework.com/docs/v2/native/file/.

Ionic 2 comes with a Cordova file plugin wrapper: http://ionicframework.com/docs/v2/native/file/.

您可以在原始插件的文档中找到必要的文件系统路径(例如 cordova.file.applicationDirectory):https://github.com/apache/cordova-plugin-file#where-to-store-files.请注意，并非所有平台都支持相同的存储路径.

The necessary file system paths (e.g. cordova.file.applicationDirectory) you can find here at the documentation of the original plugin: https://github.com/apache/cordova-plugin-file#where-to-store-files. Note that not all platforms support the same storage paths.

我什至设法用它构建了一个文件浏览器.像这样使用它:

I even managed to build a file browser with it. Use it like so:

import {Component} from '@angular/core';
import {File} from 'ionic-native';

...

File.listDir(cordova.file.applicationDirectory, 'mySubFolder/mySubSubFolder').then(
  (files) => {
    // do something
  }
).catch(
  (err) => {
    // do something
  }
);

这篇关于Ionic 2 文件插件使用示例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！