Two questions about MQL if any one can answer?

Hello MT4 coders, I have 2 questions if you can answer please.

1. Suppose that my EA opens a trade and at some point I closes the half trade. How I make the EA to remember that a specific trade is already has been closed half?It should also remember if I restart mt4.!

2. Suppose I attach an EA on a chart and exit the MT4. If I re-open MT4 the EA starts working automatically as I attached it on chart on previous. So I want a function to call only once when ever MT4 is re-opened? init() function is only called when we first time attach EA/indicator to chart.

Any help?

Thanks

The init function runs again when you open MT4, not only the first time you load the EA.

There are a couple of ways to get the EA to remember whether it has closed half the trade or not. Presumably you would use an EA issued market order for the partial close. This implies that there is no takeprofit set. When you do the partial close, set a takeprofit(even if it is a fake one) and you can then use this as a flag so the EA can determine if the partial close has happened or not.

You could also write the orderstate to file but that is more complicated.

Thanks for the useful tip. At the moment I am using comment option. As I close half trade, MT4 changes my comments to anything else so I check if comment is original or changed. Its working fine but I want more trustable one.

Ya, the comment is unreliable because you cannot be certain what a different broker will do with your comments. Some brokers change comments in the normal course of trading, like MB trading when they cannot fill your full order, they sometimes split the order and then they change the comment to reflect this.