读取目录中的所有文件，将它们存储在对象中，然后发送对象 [英] Reading all files in a directory, store them in objects, and send the object

问题描述

我不知道这是否可行，但是可以了.而且使用回调会更加困难.

I do not know if this is possible, but here goes. And working with callbacks makes it even more difficult.

我有一个目录，其中包含html文件，这些文件要通过node.js和socket.io的对象块形式发送回客户端.

I have a directory with html files that I want to send back to the client in Object chunks with node.js and socket.io.

我所有的文件都在/tmpl

All my files are in /tmpl

因此套接字需要读取/tmpl中的所有文件.

So socket needs to read all the files in /tmpl.

对于每个文件，它必须将数据存储在一个对象中，该对象以文件名作为键，将内容作为值.

for each file it has to store the data in an object with the filename as the key, and the content as the value.

  var data;
  // this is wrong because it has to loop trough all files.
  fs.readFile(__dirname + '/tmpl/filename.html', 'utf8', function(err, html){
      if(err) throw err;
      //filename must be without .html at the end
      data['filename'] = html;
  });
  socket.emit('init', {data: data});

最后的回调也是错误的.当目录中的所有文件都完成后，必须调用它.

The final callback is also wrong. It has to be called when all the files in the directory are done.

但是我不知道如何创建代码，有人知道这是否是possibel吗?

But I do not know how to create the code, anyone know if this is possibel?

推荐答案

因此，分为三个部分.读取，存储和发送.

So, there are three parts. Reading, storing and sending.

这是阅读部分:

var fs = require('fs');

function readFiles(dirname, onFileContent, onError) {
  fs.readdir(dirname, function(err, filenames) {
    if (err) {
      onError(err);
      return;
    }
    filenames.forEach(function(filename) {
      fs.readFile(dirname + filename, 'utf-8', function(err, content) {
        if (err) {
          onError(err);
          return;
        }
        onFileContent(filename, content);
      });
    });
  });
}

这是存储部分:

var data = {};
readFiles('dirname/', function(filename, content) {
  data[filename] = content;
}, function(err) {
  throw err;
});

发送部分取决于您.您可能希望一一发送或阅读完毕后发送给他们.

The sending part is up to you. You may want to send them one by one or after reading completion.

如果要在读取完成后发送文件，则应使用fs函数的同步版本或使用Promise.异步回调不是一种好的样式.

If you want to send files after reading completion you should either use sync versions of fs functions or use promises. Async callbacks is not a good style.

您还询问了如何剥离扩展程序.您应该一个一个地处理问题.没有人会为您编写完整的解决方案.

Additionally you asked about stripping an extension. You should proceed with questions one by one. Nobody will write a complete solution just for you.

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