HTML is nowadays one of the wide-spread types of documents. MetaTrader 4 Client Terminal allows you to save statements, test and optimization reports as .htm files. It is sometimes necessary to get information from such files in an MQL4 program. The article describes one of variations of how to get the tag structure and contents from HTML.
In this article, the author proposes the way of improving trading systems presented in his previous articles. The article is of interest for traders already having experiences in writing Expert Advisors.
A rather universal approach to writing indicators of the ZigZag type is proposed. The method includes a significant part of ZigZags already described and allows you to create new ones relatively easily.
An indicator for interactive working with trend lines, Fibo levels, icons manually imposed on a chart. It allows you to draw the colored zones of Fibo levels, shows the moments of the price crossing the trend line, manages the "Price label" object.
The article describes a method of changing the external parameters of MQL4 programs on-the-fly, without restarting.
The article describes creation of an indicator that would display the support/resistance levels using up/down fractals.