仅从node.js中的套接字读取前N个字节 [英] Read only first N bytes from socket in node.js

问题描述

var server = net.createServer(function(c) {
  //...
  c.on('data', function(data) {
    //The data is all data, but what if I need only first N and do not need other data, yet.
    c.write(data);
  });
  //...
};

有没有办法只读取定义的数据部分?例如:

Is there a way to read only defined portion of data? For example:

c.on('data', N, function(data) {
  //Read first N bytes
});

其中N是我期望的字节数.因此，回调仅从M个字节中获取N个.

Where N is number of bytes I expect. So the callback gets only N out of M bytes.

解决方法是(感谢mscdex):

The solution is (thanks to mscdex):

c.on('readable', function() {
  var chunk,
      N = 4;
  while (null !== (chunk = c.read(N))) {
    console.log('got %d bytes of data', chunk.length);
  }
});

推荐答案

节点v0.10 +中的可读流具有

Readable streams in node v0.10+ have a read() that allows you to request a number of bytes.

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