ExpertSample.dll project, GetRatesItemValue function. You can change RateInfo values and this changes will be reflected on current loaded historical data.
C:\Program Files\MetaTrader 4\experts\samples

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I wish to write a custom .DLL to process BAR data. I will pass Open and Close to my .DLL, modify the O and C, and pass it back to MQL4 in a 2 dimentional array... can someone provide an MQL4 example on how this can be done? To my knowledge I can't return an Array from the .DLL... but maybe there is a work-around.
Thanks in advance.
-charliev