I need documentation about that.
Some info:
http://www.metatrader.info/node/150
https://www.mql5.com/en/forum/45760
and
stringo 2006.09.05 12:08
Yes, wrapper. Your sample looks right.
You cannot write in VB well formed (for MQL4) function
See declarations in C++

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Is there a way to code a DLL in Visual Basic to use in MT4 ?