如何获取Chrome扩展程序的根文件夹？

发布于 2025-01-06 03:41:31 字数 733 浏览 1 评论 0原文

我是第一次开发 Chrome 扩展，并且正在遵循解释相关内容的唯一指南： HTML5 ROCKS - 文件系统。我需要为我的扩展获取存储空间，我解决了这样的问题：

window.webkitStorageInfo.requestQuota(window.PERSISTENT,1024*1024, onInitFs, errorHandler);

好的，它可以工作。现在我需要在根目录中创建一个xml文件，但在“onInitFs”中，“fs”var只是一个数字，“fs.root”无法获取它。

function onInitFs(fs){

    console.log(fs.root); // -> Undefined

    fs.root.getFile('list.xml', {create: true, exclusive: true}, function(fileEntry) {
        fileEntry.isFile === true;
        fileEntry.name == 'list.xml';
        fileEntry.fullPath == '/list.xml';

    }, errorHandler); 
}

谁能解释为什么它不起作用以及如何解决这个问题？

原文

I am developing a Chrome Extesion for the first time and I am following the only guide that explains something about that: HTML5 ROCKS - FILESYSTEM.
I need to get storage for my extension and I resolved so:

window.webkitStorageInfo.requestQuota(window.PERSISTENT,1024*1024, onInitFs, errorHandler);

Ok, it works.
Now I need to create a xml file into the root, but in "onInitFs" the "fs" var is only a number and "fs.root" can't get it.

function onInitFs(fs){

    console.log(fs.root); // -> Undefined

    fs.root.getFile('list.xml', {create: true, exclusive: true}, function(fileEntry) {
        fileEntry.isFile === true;
        fileEntry.name == 'list.xml';
        fileEntry.fullPath == '/list.xml';

    }, errorHandler); 
}

Can anybody explain why it doesn't work and how to resolve this issue?

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兲鉂ぱ嘚淚 2025-01-13 03:41:31

在 Chrome 扩展程序中使用 RequestFileSystem

为了将 FileSystem API 用作 Chrome 扩展程序的根文件系统，您实际上可以使用 window.webkitRequestFileSystem 而不是 requestQuota。

window.webkitRequestFileSystem(window.PERSISTENT, 1024 * 1024, function (filesystem) {      
        console.log(filesystem);                
        console.log(filesystem.root);
}, function (e) { console.log("Could not request File System"); });

对于我来说，这确实可以在 Chrome 15,16 和 17 上正确打印：

DOMFileSystem
DirectoryEntry

Using requestQuota for HTML5 apps

仅供参考，这将是实际请求配额的方式（即，当不使用 Chrome 扩展时）。您必须首先请求配额（用户会在他/她的窗口顶部看到一个小横幅）。如果用户接受，则调用 RequestFileSystem。

window.webkitStorageInfo.requestQuota(PERSISTENT, 1024*1024, function(grantedBytes) {
  window.webkitRequestFileSystem(PERSISTENT, grantedBytes, onInitFs, errorHandler); 
}, function(e) {
  console.log('Error requesting filesystem', e); 
});

最终可能需要在扩展中请求配额。目前，可以通过 unlimitedStorage 权限来规避此问题。有关实现/存储类型的当前状态，请参阅 http://code.google.com/ chrome/whitepapers/storage.html

Using RequestFileSystem within Chrome Extension

In order to use the FileSystem API as a root filesystem for your Chrome extension, you can actually use window.webkitRequestFileSystem instead of requestQuota.

window.webkitRequestFileSystem(window.PERSISTENT, 1024 * 1024, function (filesystem) {      
        console.log(filesystem);                
        console.log(filesystem.root);
}, function (e) { console.log("Could not request File System"); });

This does print correctly on Chrome 15,16 and 17 for me:

DOMFileSystem
DirectoryEntry

Using requestQuota for HTML5 apps

Just for reference, this would be the way to actually request the quota (i.e., when not using a Chrome Extension). You have to request the quota (the user sees a little banner at the top of his/her window) first. The RequestFileSystem is called if the user accepts.

window.webkitStorageInfo.requestQuota(PERSISTENT, 1024*1024, function(grantedBytes) {
  window.webkitRequestFileSystem(PERSISTENT, grantedBytes, onInitFs, errorHandler); 
}, function(e) {
  console.log('Error requesting filesystem', e); 
});

Eventually it might be necessary to request quota within an extension. Currently this can be circumvented with the unlimitedStorage permission. For the current state of implementation/storage types, see http://code.google.com/chrome/whitepapers/storage.html

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