Save to file - file not created

[Luis P. Mendes]

Hi,

This script doesn't create a csv file with some headers.
What I want is to create the file with heading before starting the scrape and then add data to it in append mode as the scraping goes.

What's wrong? How to create the file?

Luis

// open csv file in write mode and save the title to it.
function initializeCsvFile() {
    var str = '';

    var fields = ["header1", "header2"];

    // build title line
    var line = '';
    for (var f = 0; f < fields.length; ++f) {
        if (line != '') line += '|'
        line += fields[f];
    }

    str += line + '\n';

    var fs = require('fs');
    fs.write(csv_file, str, 'w');
    casper.log("csv_file: " + csv_file);
    casper.log("str: " + str);
    fs.close();
}

casper.start(function() {
    initializeCsvFile();
});

casper.run(function() {
    this.exit();
});

[Luis P. Mendes]

Any help on this?