app.post('/api/blk/pedazosDeInfo',(req,res) => {
    ruta = req.body.ruta;
    informacion = req.body.informacion;
    offset = parseInt( req.body.offset );

    ruta = _path.join(__dirname, '..','..' ,ruta);
    buffer = new Buffer(informacion);

    fsExtra.ensureFile(ruta, err => {// A: file has now been created, including the directory it is to be placed in
        if (err) console.log(err) // => null

        fs.open(ruta, 'r+', function(err, fd) {
            if (err) {
                throw 'error opening file: ' + err;
            }
            fs.write(fd, buffer, 0, buffer.length, offset, function(err) {
                if (err) throw 'error writing file: ' + err;
                fs.close(fd, function() {
                    res.send('file written');
                })
            });
        });
    })
})