node.js appium screenshot

screenshot

Android.prototype.getScreenshot = function(cb) {
  this.proxy(["screenshot", {}], function(err, res) {
    var me = this;
    var delayTimes = 0;
    var remotePath = null;
    var localPath = "/tmp/";
    if (typeof res.value !== 'undefined' && res.value.length > 0) {
      remotePath = res.value;
      localPath += path.basename(remotePath);
    } else {
      res = null;
      err = new Error("Unable to get screenshot file.");
      cb(err, res);
    }

    // Copy the file off the device
    var cmd = me.adb.adbCmd + ' pull "' + remotePath + '" "' + localPath + '"';
    exec(cmd,function(err, stdout) {
      if (err) {
        logger.error(err);
        cb(err);
      } else {
        // Useful for debugging.
        logger.debug(stdout);
        cb(null);
      }
    });

    var onErr = function() {
      delayTimes++;
      var next = function() {
        if (delayTimes <= 10) {
          read(onErr);
        } else {
          read();
        }
      };
      setTimeout(next, 300);
    };

    var read = function(onErr) {
      var doRead = function() {
        fs.readFile(localPath, function read(err, data) {
          if (err) {
            if (onErr) {
              return onErr();
            } else {
              res = null;
              err = new Error("Timed out waiting for screenshot file. " + err.toString());
            }
          } else {
            var b64data = new Buffer(data).toString('base64');
            res.value = b64data;
          }
          cb(err, res);
        });
      };
      doRead();
    };

    read(onErr);
  });
};

error: uncaughtException date=Fri Apr 19 2013 10:29:02 GMT-0500 (CDT), pid=85163, uid=501, gid=20, cwd=/Users/plaster/rep/appium, execPath=/usr/local/bin/node, version=v0.10.0, argv=[node, /Users/plaster/rep/appium/server.js, -V], rss=31633408, heapTotal=20686848, heapUsed=12435552, loadavg=[2.1650390625, 1.83251953125, 1.791015625], uptime=486412, trace=[column=19, file=/Users/plaster/rep/appium/app/android.js, function=pull, line=585, method=null, native=false, column=5, file=/Users/plaster/rep/appium/app/android.js, function=null, line=630, method=null, native=false, column=9, file=/Users/plaster/rep/appium/app/device.js, function=exports.respond, line=26, method=respond, native=false, column=16, file=/Users/plaster/rep/appium/app/android.js, function=, line=228, method=null, native=false, column=9, file=/Users/plaster/rep/appium/uiautomator/adb.js, function=, line=566, method=null, native=false, column=17, file=events.js, function=Socket.EventEmitter.emit, line=95, method=EventEmitter.emit, native=false, column=14, file=_stream_readable.js, function=, line=699, method=null, native=false, column=17, file=events.js, function=Socket.EventEmitter.emit, line=92, method=EventEmitter.emit, native=false, column=10, file=stream_readable.js, function=emitReadable, line=382, method=null, native=false, column=5, file=_stream_readable.js, function=emitReadable, line=377, method=null, native=false], stack=[TypeError: Cannot read property 'adb' of undefined, at pull (/Users/plaster/rep/appium/app/android.js:585:19), at /Users/plaster/rep/appium/app/android.js:630:5, at exports.respond (/Users/plaster/rep/appium/app/device.js:26:9), at null. (/Users/plaster/rep/appium/app/android.js:228:16), at null. (/Users/plaster/rep/appium/uiautomator/adb.js:566:9), at Socket.EventEmitter.emit (events.js:95:17), at Socket. (stream_readable.js:699:14), at Socket.EventEmitter.emit (events.js:92:17), at emitReadable (_stream_readable.js:382:10), at emitReadable (_stream_readable.js:377:5)]