HTML5文件系统-如何使用目录读取器读取目录? [英] HTML5 File System - How to read directories using directory reader?

问题描述

我使用文件输入和webkit目录加载了一个目录，如下所述.

I loaded a directory using file input and webkitdirectory as mentioned below.

<input  id="file_input"  type="file" webkitdirectory directory  />

选择目录后，我可以读取文件大小和其他信息.我的问题是如何使用DirectoryReader界面读取此目录.

After directory selected I can read file size and other information. My question is how to read this directory using DirectoryReader interface.

我尝试使用以下代码，但未成功. results.length变为零.我想念什么吗?

I tried with below code, but not success. results.length becomes zero. Am I missing anything?

window.requestFileSystem(TEMPORARY, 1024*1024 /*1MB*/, function(fs) {
        var dirReader = fs.root.createReader();
        var entries = [];
        // Call the reader.readEntries() until no more results are returned.
        var readEntries = function() {
            dirReader.readEntries(function(results) {
                // If no more results are returned, we're done.
                if (!results.length) {
                    // Sort list by name of entry.
                    entries.sort(function(a, b) {
                        return a.name < b.name ? -1 :
                        b.name < a.name ? 1 : 0;
                    });
                   // listResults(entries); // Render the list.
                } else {
                    // Add in these results to the current list.
                    entries = entries.concat(toArray(results));
                    readEntries();
                }
            }, errorHandler);
        };
        readEntries(); // Start reading the directory.
    }, errorHandler);

感谢您的帮助.

推荐答案

要读取目录的内容:

fs.root.getDirectory('Documents', {}, function(dirEntry){
  var dirReader = dirEntry.createReader();
  dirReader.readEntries(function(entries) {
    for(var i = 0; i < entries.length; i++) {
      var entry = entries[i];
      if (entry.isDirectory){
        console.log('Directory: ' + entry.fullPath);
      }
      else if (entry.isFile){
        console.log('File: ' + entry.fullPath);
      }
    }

  }, errorHandler);
}, errorHandler);

在上面的代码中，isDirectory和isFile属性用于分别获取目录和文件的不同输出.另外，我们使用fullPath属性来获取条目的完整路径，而不仅仅是其名称.

In the code above, the isDirectory and isFile properties are used in order to obtain a different output for directories and files, respectively. Additionally, we use the fullPath property in order to get the full path of the entry, instead of its name only.

来自: http://net.tutsplus.com/tutorials/html-css-techniques/toying-with-the-html5-filesystem-api/

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