Hi Beixu, admitedly I'm clueless on this one, I don't have much experience with EA's... there's a document here that might be helpful: http://www.forexmt4.com/_MT4_Tutorials/Trading%20functions.pdf

Kartik Chauhan wrote:

Hey brother!! Is there is any way this strategy can work against me?? And if this strategy is so good than why all people don't use this strategy?? Any reply will be highly appreciated.... thanks

Unfortunately, it can happen that the pair you're trading goes into a range. Which means price can bounce back and forth and hit your various SL levels...if this happens 6 or 7 times it can wipe out your account. That's why it's important to time your entries very carefully (that's why I never open positions on a Friday for example).