show Windows system letter using node.js

windowsSystemLetterTest.js

var exec = require('child_process').exec;

// show  Windows letter, to compatible Windows xp

function showLetter(callback) {
    var wmicResult;
    var command = exec('wmic logicaldisk get caption', function(err, stdout, stderr) {
        if(err || stderr) {
            console.log("root path open failed" + err + stderr);
            return;
        }
        wmicResult = stdout;
    });
    command.stdin.end();   // stop the input pipe, in order to run in windows xp
    command.on('close', function(code) {
        console.log("wmic close:: code:" + code);
        var data = wmicResult.split('\n'), result = {};
        callback(result);
    });
}

/**
 *  output:
 *  Caption
 *  C:
 *  D:
 *  E:
 *  F:
 *  G:
 **/