Great information on MQL4 to MQL5 conversion
April 16th, 2012
As I’ve started to quickly convert one of my most trusted scalpers to MetaTrader5 (to trade on the Alpari UK ECN MT5 platform) I found this little gem: http://www.mql5.com/en/articles/81
It quickly describes most of the changes needed to get a MQL4 based EA running. When I go through the list I actually can’t understand why some of these have changed. Change without reason is always bad. It does omit trading functions, which is changed quite a bit in MQL5. It is probably a good idea to implement these from the ground up.