History Logger
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Here's my history logger. A little messy but it works. Still can't seem to get it to work on MT5 though.

It writes the whole history to file when you start it and re-writes every time a trade closes.
Great for looking for good performing EAs on demo.https://fxdreema.com/shared/moX1emVJc
I have a Perl script for parsing it with.
Edit: The logger appears to have a strange bug. Each time it writes out the trade history it seems to include the data from the previous loop. So each time it triggers the written file grows by the size of the whole trade history. With still only one header. Very strange.