Firefox书签探索不会超过Java的第一级

我已经编写了一些代码来浏览我的Firefox书签,但是我只获得了第一级书签(即,我没有在文件夹中获得链接).

例如

>搜索引擎/

> yahoo.com

> google.com

在此示例中,我只能访问Search_engines和google.com,而不能访问yahoo.com

我的函数是递归的,我不知道为什么会这样.

我的代码：

function browse_bookmark_node(bookmark_node, array)
{
    // We explore the bookmarks with this function     
   // iterate over the immediate children of this folder
   for (var i = 0; i < bookmark_node.childCount; i ++) {
       var node = bookmark_node.getChild(i);
       if (node.type ==0) {
          // the node is a link so we add it to the array
          array.push(node.title); 
       } else if (node.type ==6) {
          // the node is a folder so we explore it
          browse_bookmark_node(node, array);
       }
   }
}

function wrapper_browse_bookmark_node(bookmark_node) {
   // We use this function to wrapp the function browse_bookmark_node and keep track of the links
   var array = [];
   browse_bookmark_node(bookmark_node, array);
   return array;
}

// All the code following is used to access firefox bookmarks and works fine
var historyService = Components.classes["@mozilla.org/browser/nav-history-service;1"]
                               .getService(Components.interfaces.nsINavHistoryService);
var options = historyService.getNewQueryOptions();
var query = historyService.getNewQuery();

var bookmarksService = Components.classes["@mozilla.org/browser/nav-bookmarks-service;1"]
                                 .getService(Components.interfaces.nsINavBookmarksService);
var bookmarksMenuFolder = bookmarksService.bookmarksMenuFolder;

query.setFolders([bookmarksMenuFolder], 1);

var result = historyService.executeQuery(query, options);
var rootNode = result.root;
rootNode.containerOpen = true;

// The function call to explore the bookmarks
var links_array = wrapper_browse_bookmark_node(rootNode);

// close a container after using it!
rootNode.containerOpen = false;

解决方法:

一个明显的错误是使用toolbarFolder作为起点,这只是书签工具栏.如果要使用所有书签(即书签菜单,书签工具栏和未排序的书签),则需要更改查询参数：

query.setFolders([
    bookmarksService.bookmarksMenuFolder,
    bookmarksService.toolbarFolder,
    bookmarksService.unfiledBookmarksFolder
], 3);

另一个问题是在nsINavHistoryResultNode对象上获取childCount属性-没有此类属性.在访问nsINavHistoryContainerResultNode的属性之前,需要显式或隐式(通过instanceof)调用QueryInterface.所以我会写：

} else if (node.type == 6 && node instanceof Components.interfaces.nsINavHistoryContainerResultNode) {
    var oldOpen = node.containerOpen;
    node.containerOpen = true;
    browse_bookmark_node(node, array);
    node.containerOpen = oldOpen;
}

标签：bookmarks,javascript,function,recursion,firefox-addon
来源： https://codeday.me/bug/20191009/1877696.html