.createreadstream value to string variable

Question

.createreadstream value to string variable

How can I set a variable equal to the data that fs.createReadStream returns, so I can print out that variable and then I'll get the file contents.

var rs = fs.createReadStream('file.txt', {encoding: 'utf8'});

How can I get the returned data into a variable for later usage.

Thanks

node.js

Answer 1

If you just want all of the data at once in a variable, you should use fs.readFile instead.

fs.readFile('file.txt', {encoding: 'utf8'}, function(err, data){
    // Use the 'data' string here.
});

That said, depending on your use-case, it would be better to leave the data as a stream and process it in chunks as it is loaded.

Answer 2

This code will help:

var data = [];
var fs = Meteor.npmRequire('fs');
CSV().from.stream(
                fs.createReadStream(file),
                {'escape': '\\'})
                .on('error', function (err) {
                    console.log(err);
                })
                .on('record', Meteor.bindEnvironment(function (row, index) {

                    data.push({
                        ESSID: row[0],
                        position: {
                            lat: row[4],
                            lng: row[5]
                        },
                        publicposition: {
                            lat: row[11],
                            lng: row[12]
                        },
                        publichost: row[13]
                    })

                }), function (err) {
                    console.log(err);
                })
                .on('end', Meteor.bindEnvironment(function (row, index) {
                   //do something with 'data'
                }))