node.js - 如何在 Node.js 中迭代 shapefile

Question

我有以下 node.js 代码，它根据来自 ( https://github.com/mbostock/shapefile ) 的代码读取 shapefile

var shp=require('shapefile');
var path="polygons.shp"
var encoding="utf8"

function readRecords(path, encoding) {
  return function() {
  var callback = this.callback;
  shp.read(path, encoding, function(error, header, records) {
  callback(error, records);
});   }; };

var rs = readRecords(path,encoding)
console.log(rs)

当我执行上面的代码时，我得到:未定义

知道如何迭代这样的对象吗？

Answer 1

在开始阅读记录之前，您需要先阅读标题。这段代码将整个 shapefile 记录到控制台:

var shapefile  = require( 'shapefile' ),
    reader = shapefile.reader( 'polygons' );

var logger = function( error, record ) {
  console.log( record );
  if( record !== shapefile.end ) reader.readRecord( logger );
}

reader.readHeader( logger );